| | Organization Name(s) | Located In |
 | Ontario Early Years Centre, Drouillard Place, Drouillard Centre | Windsor Central |
| Ontario Early Years Centre, Drouillard Place, Grandview Centre | Windsor West |
| Oak Park Co-operative Children's Centre | London |
| Oakwood Bible Chapel | Windsor West |
| Oakwood Duplicate Bridge Club | Sarnia |
| Oasis Medical Centre, Walk-in Clinic | Lakeshore |
| Oasis Retirement Residence | Lucan |
| Occupational Health Clinic for Ontario Workers, Windsor Branch | Windsor South |
| Occupational Health Clinic for Ontario Workers Inc. | Point Edward |
| Occupational Health Clinics for Ontario Workers, Sarnia-Lambton Site | Point Edward |
| | Occupational Therapy Services | Forest |
| | Occupational Therapy Services, Pathways Health Centre for Children | Sarnia |
| Office of the Employer Adviser, Windsor-Essex County Branch | Windsor Central |
| Office of the Worker Adviser, Windsor-Essex County Branch | Windsor Central |
| | Oil Heritage District Community Centre | Petrolia |
| Oil Museum of Canada | Oil Springs |
| Oil Springs (Corporation of the Village of) | Oil Springs |
| | Oil Springs Fire Depot | Oil Springs |
| | Oil Springs Postal Outlet | Oil Springs |
| | Oil Springs. Mayor | Oil Springs |
| | Oil Springs. Municipal Office | Oil Springs |
| Old Colony Mennonite Church | Wheatley |
| Old Colony Mennonite Church, Wheatley | Wheatley |
| | Old Riverside Town Centre | Windsor East |
| Olde Sandwich Towne Business Association | Windsor West |
| Olinda-Ruthven United Church | Ruthven |
| Ombudsman of Ontario | Toronto |
| On Your Own - a Youth Survival Guide, A Directory of Services for Youth | Chatham |
| | Ontario Energy Board, Consumer Relations Centre | Toronto North |
| Once Upon A Time Child Care Centre, Cottam | Cottam |
| Once Upon A Time Child Care Centre, Essex | Essex (Town of) |
| Once Upon A Time Child Care Centre, Maidstone | Maidstone (Village of) |
| One to One Volunteer Tutor Program | Sarnia |
| | Oneida Nation of the Thames | Southwold |
| | Oneida Nation of the Thames, Assistance Program | Southwold |
| | Oneida Nation of the Thames, Economic Opportunities | Southwold |
| | Oneida Nation of the Thames, Economic Opportunities, Economic Development | Southwold |
| | Oneida Nation of the Thames, Economic Opportunities, Employment and Training | Southwold |
| | Oneida Nation of the Thames, Life-Long Learning | Southwold |
| | Oneida Nation of the Thames, Life-Long Learning, Child Care Centre | Southwold |
| | Oneida Nation of the Thames, Life-Long Learning, Language and Culture Program | Southwold |
| | Oneida Nation of the Thames, Life-Long Learning, Oneida Nation Head Start | Southwold |
| | Oneida Nation of the Thames, Life-Long Learning, Standing Stone School | Southwold |
| Oneida Nation of the Thames, Oneida Health Centre | Southwold |
| Oneida Nation of the Thames, Oneida Health Centre, Alcohol and Drug Abuse Program | Southwold |
| Oneida Nation of the Thames, Oneida Health Centre, Community Diabetes | Southwold |
| Oneida Nation of the Thames, Oneida Health Centre, Community Health | Southwold |
| Oneida Nation of the Thames, Oneida Health Centre, Healthy Babies Healthy Children | Southwold |
| Oneida Nation of the Thames, Oneida Health Centre, Home and Community Care Program | Southwold |
| Oneida Nation of the Thames, Oneida Health Centre, Medical Transportation | Southwold |
| | Oneida Nation of the Thames, Safe and Sustainable Community | Southwold |
| | Oneida Nation of the Thames, Safe and Sustainable Community, Emergency Medical Services (EMS) | Southwold |
| | Oneida Nation of the Thames, Safe and Sustainable Community, Fire | Southwold |
| | Oneida Nation of the Thames, Safe and Sustainable Community, Police | Southwold |
| Oneida Nation of the Thames, Tsi’Nu: Youantle Na’Tuhuwatisni | Southwold |
| Oneida Nation of the Thames, Wellness | Southwold |
| Oneida Nation of the Thames, Wellness, Band Representative | Southwold |
| | Oneida Nation of the Thames, Wellness, Community Centre | Southwold |
| Oneida Nation of the Thames, Wellness, Human Services | Southwold |
| Oneida Nation of the Thames, Wellness, Mental Health | Southwold |
| Oneida Nation of the Thames, Wellness, Ontario Works | Southwold |
| | Oneida Nation of the Thames, Wellness, Onyota'a:ka Family Healing Lodge | Southwold |
| | Ontario 4-H Association, Oxford 4-H Association Region 6 | Bright |
| Ontario Addiction Treatment Centres, Windsor Clinic | Windsor West |
| Ontario. Alcohol and Gaming Commission | Windsor Central |
| | Ontario Association for Families of Children with Communication Disorders | Tillsonburg |
| Ontario Association of Social Workers, Southwestern Branch | Windsor Central |
| Ontario Breast Screening Program, Chatham-Kent Health Alliance, Diagnostic Imaging-Mammography Department | Chatham |
| Ontario Breast Screening Program, Hotel-Dieu Grace Hospital, Breast Centre | Windsor Central |
| Ontario Breast Screening Program, Tillsonburg District Memorial | Tillsonburg |
| Ontario Breast Screening Program, Woodstock Hospital | Woodstock |
| Ontario Breast Screening Program - South West | London |
| | Ontario Breast Screening Program-Bluewater Health, Bluewater Health | Sarnia |
| Ontario Chiropractic Association | Toronto Central |
| Ontario Clean Water Agency, Sewage Treatment Plant | Belle River (Town of) |
| Ontario Court of Justice, Sarnia Chapter | Sarnia |
| Ontario Disability Support Program, ODSP | Sarnia |
| Ontario Early Years Centre, Arkona Outreach | Arkona |
| Ontario Early Years Centre, Chatham-Kent | Chatham |
| Ontario Early Years Centre, City Hall Square Child Minding Room | Windsor Central |
| Ontario Early Years Centre, Connections Early Years Family Centre | Windsor Central |
| Ontario Early Years Centre, Franco-Sol Garderie et centre de ressources, Resource Centre and Toy Lending library, Satellite Centre | Windsor West |
| Ontario Early Years Centre, Great Beginnings Child Centered Co-operative Inc, Bloomfield | Windsor West |
| Ontario Early Years Centre, Great Beginnings Child Centered Co-operative Inc, California | Windsor West |
| Ontario Early Years Centre, Lassaline Centre | Windsor East |
| Ontario Early Years Centre, Sarnia Lambton | Sarnia |
| Ontario Early Years Centre, Ska:na Family Learning Centre | Windsor East |
| Ontario Early Years Centre, Youth and Family Resource Network of Essex County, Kingsville Early Years Steps (KEYS) to Learning | Kingsville |
| Ontario Early Years Centre - Elgin-Middlesex-London | St Thomas |
| Ontario Early Years Centre - Glencoe | Glencoe |
| Ontario Early Years Centre - London North Centre | London |
| Ontario Early Years Centre - London West | London |
| Ontario Early Years Centre - London-Fanshawe | London |
| Ontario Early Years Centre - Mount Brydges | Mount Brydges |
| Ontario Early Years Centre - Perth-Middlesex, Ilderton Site | Ilderton |
| Ontario Early Years Centre - Strathroy | Strathroy |
| Ontario Early Years Centre Alvinston Site | Alvinston |
| Ontario Early Years Centre Camlachie Outreach | Camlachie |
| Ontario Early Years Centre Forest Site | Forest |
| Ontario Early Years Centre Grand Bend Outreach | Grand Bend |
| Ontario Early Years Centre of Chatham-Kent, Chatham-Kent Children's Services | Chatham |
| Ontario Early Years Centre Outreach, Brigden | Brigden |
| Ontario Early Years Centre Petrolia Site | Petrolia |
| Ontario Early Years Centre Thedford Outreach | Thedford |
| Ontario Early Years Centre Watford Outreach | Watford |
| Ontario Early Years Centre Wyoming Outreach | Wyoming |
| Ontario Early Years Centres, Administration Office | Windsor Central |
| Ontario Early Years Centres, Benson Centre | Windsor West |
| Ontario Early Years Centres, Brock Centre | Windsor West |
| Ontario Early Years Centres, Glengarry Centre | Windsor West |
| Ontario Early Years Centres, Harrow Centre | Harrow |
| Ontario Early Years Centres, Holy Name Centre | Essex (Town of) |
| Ontario Early Years Centres, Lakeshore Centre | Lakeshore |
| Ontario Early Years Centres, Mill Street Centre (Leamington) | Leamington (Town of) |
| Ontario Early Years Centres, Ouellette Avenue Centre | Windsor Central |
| Ontario Early Years Centres, Our Lady of Perpetual Help School | Windsor |
| Ontario Early Years Centres, Sacred Heart Centre | LaSalle |
| Ontario Early Years Centres, St Bernard | Amherstburg (Town of) |
| Ontario Early Years Centres, St. Pius | Tecumseh |
| Ontario Early Years Centres, Talbot Trail Centre | Windsor South |
| Ontario. Employment Ontario, Apprenticeship Office, Windsor | Windsor Central |
| | Ontario Energy Board, Oxford County Sites, LEAP Emergency Financial Assistance | Oxford County |
| Ontario English Catholic Teachers Association, Elementary School Teachers | Windsor East |
| Ontario English Catholic Teachers Association, Secondary School Teachers, Windsor-Essex Secondary Unit | Windsor East |
| | Ontario English Catholic Teachers Association - Elementary | Wallaceburg |
| | Ontario English Catholic Teachers Association - Secondary | Sarnia |
| | Ontario Federation of All Terrain Vehicle Clubs, Essex County ATV Club | Essex County |
| Ontario. Financial Services Commission of Ontario | Toronto |
| Ontario Genealogical Society, Essex County Branch | Windsor Central |
| Ontario Genealogical Society, Kent Branch | Chatham |
| Ontario Genealogical Society, Oxford County Branch | Woodstock |
| Ontario Greenhouse Vegetable Growers | Leamington (Town of) |
| | Ontario Healthy Communities Coalition, OHCC | Toronto |
| Ontario Heritage Trust, Uncle Toms Cabin Historic Site, Dresden | Dresden |
| Ontario Institute of Audio Recording Technology | London |
| Ontario Lung Association - Bluewater Thames Valley Area | London |
| | Ontario March of Dimes, Post-Polio Canada, Windsor & Area Post-Polio Chapter | Windsor |
| Ontario March of Dimes - Southwest Regional Office | London |
| Ontario March of Dimes - Southwest Regional Office, Employment Services | London |
| Ontario Ministry of Agriculture & Food, Ministry of Rural Affairs, Regional Economic Development Office, Blenheim | Blenheim |
| Ontario. Ministry of Attorney General, Ontario Court of Justice, Criminal, Family, and Youth Court | Windsor Central |
| Ontario. Ministry of Attorney General, Ontario Court of Justice, Provincial Offences Court | Windsor Central |
| Ontario. Ministry of Attorney General, Superior Court of Justice, Civil/Criminal/Enforcements/Small Claims/Family Court House | Windsor Central |
| Ontario Ministry of Children and Youth Services, Youth Justice Services Division, Western Region | Chatham |
| Ontario Ministry of Children and Youth Services, Youth Probation | Sarnia |
| Ontario. Ministry of Children and Youth Services, Western Region, Windsor, Youth Justice Services | Windsor Central |
| Ontario. Ministry of Citizenship and Immigration, Regional Services Branch, West Region, Windsor Office | Windsor West |
| Ontario. Ministry of Community and Social Services, Ministry of Children and Youth Services, Ontario Disability Support Program, Windsor | Windsor Central |
| Ontario. Ministry of Community and Social Services, Ministry of Children and Youth Services, South West Region, Windsor | Windsor Central |
| Ontario. Ministry of Community and Social Services, Ministry of Children and Youth Services, South West Region, Windsor, Children's Services - Assistance for Children with Severe Disabilities | Windsor Central |
| Ontario. Ministry of Community and Social Services, Ministry of Children and Youth Services, South West Region, Windsor, Children's Services - Special Services at Home Program | Windsor Central |
| Ontario. Ministry of Community Safety and Correctional Services, Ontario Provincial Police, Essex (M) Detachment | Harrow |
| Ontario. Ministry of Community Safety and Correctional Services, Ontario Provincial Police, Essex County Detachment | Essex |
| Ontario. Ministry of Community Safety and Correctional Services, Ontario Provincial Police, Kingsville Detachment | Kingsville (Town of) |
| Ontario. Ministry of Community Safety and Correctional Services, Ontario Provincial Police, Lakeshore Detachment | Belle River (Town of) |
| Ontario. Ministry of Community Safety and Correctional Services, Ontario Provincial Police, Tecumseh Detachment | Tecumseh (Town of) |
| Ontario. Ministry of Community Safety and Correctional Services, Probation and Parole Office, Windsor | Windsor Central |
| Ontario. Ministry of Community Safety and Correctional Services, Probation and Parole Office, Leamington | Leamington (Town of) |
| Ontario. Ministry of Tourism and Culture, Regional Services Branch, West Region | Windsor West |
| Ontario. Ministry of Economic Development and Innovation, Southwestern Ontario, Business Advisory Services Branch | Windsor Central |
| Ontario. Ministry of Environment | Windsor East |
| Ontario. ServiceOntario, Land Registry Office 12 Windsor | Windsor Central |
| Ontario. Ministry of Health and Long-term Care, Central Ambulance Communication Centre, Windsor | Windsor East |
| Ontario. Ministry of Labour, Windsor-Essex County Branch | Windsor East |
| Ontario Ministry of Natural Resources, Chatham-Kent | Chatham |
| | Ontario. Ministry of Revenue, Healthy Homes Renovation Tax Credit | Oshawa |
| Ontario. Ministry of the Attorney General, Crown Attorney | Windsor Central |
| Ontario Ministry of the Attorney General, Justice of the Peace | Chatham |
| | Ontario. Ministry of the Attorney General, Office of the Children's Lawyer | Toronto Central |
| Ontario. Ministry of Tourism Culture and Sport, Ontario Travel Information Centre, Park St | Windsor Central |
| Ontario Nurses Association, Windsor Office | Windsor |
| | Ontario Provincial Police, Corunna Satellite Detachment | Corunna |
| | Ontario Provincial Police, Detachments in Lambton County | Petrolia |
| | Ontario Provincial Police, Forest Satellite Detachment | Forest |
| Ontario Provincial Police, Oxford County Detachment, Community Services Ingersoll | Ingersoll |
| Ontario Provincial Police, Oxford Detachment, Community Services Tillsonburg | Tillsonburg |
| | Ontario Provincial Police, Point Edward Satellite Detachment | Point Edward |
| Ontario Provincial Police - Elgin Detachment | St Thomas |
| Ontario Provincial Police - Middlesex Detachment | Strathroy |
| Ontario Provincial Police - Middlesex Detachment, Glencoe Office | Glencoe |
| Ontario Provincial Police - Middlesex Detachment, London Office | London |
| Ontario Provincial Police - Middlesex Detachment, Lucan Office | Lucan |
| Ontario Public Interest Research Group, Windsor | Windsor West |
| Ontario Public Service Employees Union, Local 135 | Windsor West |
| | Ontario Questers | Windsor |
| Ontario Restaurant Hotel and Motel Association, Windsor Region | Windsor West |
| Ontario Secondary School Teachers' Federation # 10 | Sarnia |
| Ontario Senior Games Association, Chatham-Kent 55+ Games District 33A | Chatham |
| Ontario Society for Special Needs Children, Easter Seals Ontario, Windsor-Essex | Windsor |
| Ontario Society for the Prevention of Cruelty to Animals, Animal Shelter, OSPCA | Chatham |
| | Ontario Tire Stewardship | Toronto |
| | Ontario Travel Information Centre | Point Edward |
| Ontario Travel Information Centre | Sarnia |
| Ontario Trillium Foundation, Essex-Kent-Lambton Counties | Windsor |
| Ontario Truck Driving School - London | London |
| Ontario,Employment Ontario, Apprenticeship Office, Chatham Area Office | Chatham |
| Ontario. Employment Ontario, Apprenticeship Office, Sarnia Area Office | Sarnia |
| Ontario. Employment Ontario - Apprenticeship Office | London |
| Ontario. Government Information Centre, Chatham-Kent | Chatham |
| Ontario. Landlord and Tenant Board - Southwestern Regional Office | London |
| Ontario. Members of the Legislative Assembly, Chatham-Kent Essex Provincial Riding, Rick Nicholls | Chatham |
| Ontario. Members of the Legislative Assembly, Essex Riding, Taras Natyshak | Essex |
| Ontario. Members of the Legislative Assembly, Lambton-Kent Middlesex Riding, Monte McNaughton, MPP | Forest |
| Ontario. Members of the Legislative Assembly, Oxford County Provincial Riding, Ernie Hardeman MPP | Woodstock |
| Ontario. Members of the Legislative Assembly, Windsor - Tecumseh Provincial Riding, Liberal representative for provincial riding of Windsor-Tecumseh | Windsor East |
| Ontario. Members of the Legislative Assembly, Windsor - West Provincial Riding, Teresa Piruzza | Windsor Central |
| Ontario. Members of the Legislative Assembly - Elgin-Middlesex-London | St Thomas |
| Ontario. Members of the Legislative Assembly - Lambton-Kent-Middlesex | Strathroy |
| Ontario. Members of the Legislative Assembly - London North Centre | London |
| Ontario. Members of the Legislative Assembly - London West | Toronto |
| Ontario. Members of the Legislative Assembly - London-Fanshawe | London |
| Ontario. Members of the Legislative Assembly, Bob Bailey, Sarnia - Lambton Provincial Riding, Bob Bailey, MPP | Sarnia |
| Ontario. Ministry of Agriculture and Food, Ministry of Rural Affairs, Oxford | Woodstock |
| | Ontario. Ministry of Agriculture, Food and Rural Affairs, Ridgetown Resource Centre, Essex County | Essex County |
| Ontario. Ministry of Agriculture, Food and Rural Affairs, Ridgetown Resource Centre, OMAFRA | Ridgetown |
| Ontario. Ministry of Agriculture, Food and Rural Affairs - London Resource Centre | London |
| Ontario. Ministry of Children and Youth Services, Provincial Parole and Probation | Sarnia |
| Ontario. Ministry of Children and Youth Services - South West Region | London |
| Ontario. Ministry of Children and Youth Services - South West Region, Assistance for Children with Severe Disabilities | London |
| Ontario. Ministry of Children and Youth Services - South West Region, Special Services at Home | London |
| Ontario. Ministry of Children and Youth Services - South West Region, Youth Justice Services | London |
| Ontario. Ministry of Community and Social Services, Community Development and Health Services, Housing and Children's Services, Homelessness Partnering Strategy, Windsor | Windsor Central |
| Ontario. Ministry of Community and Social Services, Ontario Disability Support Program, South West Region, Chatham-Kent, ODSP, ACSD | Chatham |
| Ontario. Ministry of Community and Social Services, Ontario Disability Support Program, Woodstock Office | Woodstock |
| Ontario. Ministry of Community and Social Services - South West Region | London |
| Ontario. Ministry of Community and Social Services - South West Region, Ontario Disability Support Program (ODSP) - London | London |
| Ontario. Ministry of Community and Social Services - South West Region, Special Services at Home (SSAH) | London |
| | Ontario. Ministry of Community Safety and Correctional Services, Emergency Management Ontario | Toronto |
| Ontario. Ministry of Community Safety and Correctional Services, Ontario Provincial Police, Chatham-Kent Detachment | Chatham |
| Ontario. Ministry of Community Safety and Correctional Services, Ontario Provincial Police, Ingersoll Detachment | Ingersoll |
| Ontario. Ministry of Community Safety and Correctional Services, Ontario Provincial Police, Tillsonburg Detachment | Tillsonburg |
| Ontario. Ministry of Community Safety and Correctional Services, Probation and Parole Services | Chatham |
| Ontario. Ministry of Community Safety and Correctional Services, Windsor Jail | Windsor West |
| Ontario. Ministry of Community Safety and Correctional Services - Elgin-Middlesex Detention Centre | London |
| Ontario. Ministry of Community Safety and Correctional Services - Office of the Chief Coroner | London |
| Ontario. Ministry of Community Safety and Correctional Services - Probation and Parole | London |
| Ontario. Ministry of Community Safety and Correctional Services - Probation and Parole | London |
| Ontario. Ministry of Community Safety and Correctional Services - Probation and Parole | London |
| Ontario. Ministry of Community Social Services, Chatham, ODSP, ACSD | Chatham |
| Ontario. Ministry of Correctional Services, Oxford County | Woodstock |
| | Ontario. Ministry of Education, Preventing Bullying and Harrassment | Toronto |
| Ontario. Ministry of Education, Public Inquiries Unit | Toronto |
| Ontario. Ministry of Education - Child Care Quality Assurance and Licensing Offices | London |
| Ontario. Ministry of Finance - London Tax Office | London |
| Ontario. Ministry of Government Services, Service Ontario, Central Production and Verification Services Branch, Land Registry Office #24 | Chatham |
| Ontario. Ministry of Government Services - Health Card Services - OHIP | London |
| Ontario. Ministry of Government Services. ServiceOntario | Sarnia |
| Ontario. Ministry of Health and Long-Term Care - South West Local Health Integration Network (LHIN 2) | London |
| Ontario. Ministry of Labour - London and Sarnia District Office | London |
| Ontario. Ministry of Labour - Office of the Employer Adviser | London |
| Ontario. Ministry of Labour - Office of the Worker Adviser (OWA) | London |
| | Ontario. Ministry of Natural Resources, Stewardship Oxford | Aylmer |
| Ontario. Ministry of the Attorney General, Chatham | Chatham |
| Ontario. Ministry of the Attorney General, Court Services Division - Chatham-Kent Court House, Chatham | Chatham |
| Ontario. Ministry of the Attorney General, Family Law Information Centre, Legal Centre 1, Windsor | Windsor Central |
| Ontario. Ministry of the Attorney General, Family Law Information Centre, Legal Centre 2, Windsor | Windsor Central |
| Ontario. Ministry of the Attorney General, Family Law Information Centre, Oxford County | Woodstock |
| Ontario. Ministry of the Attorney General, Ontario Court of Justice, Provincial Division, Provincial Offences Court, Chatham | Chatham |
| Ontario. Ministry of the Attorney General, Registration and Enforcement Unit | Windsor Central |
| Ontario. Ministry of the Attorney General, Victim/Witness Assistance Program | Woodstock |
| Ontario. Ministry of the Attorney General - Office of the Public Guardian and Trustee | London |
| Ontario. Ministry of the Attorney General - Superior Court of Justice and Ontario Court of Justice | London |
| Ontario. Ministry of the Attorney General - Victim/Witness Assistance Program (VWAP) | London |
| Ontario. Ministry of the Attorney General - Victim/Witness Assistance Program (VWAP) | St Thomas |
| Ontario. Ministry of the Environment - London Regional Office | London |
| Ontario. Ministry of Transportation, Enforcement Services, Windsor | Windsor Central |
| Ontario. Ministry of Transportation, Senior Driver Licence Renewal Program, Windsor | Windsor Central |
| Ontario. Ministry of Transportation, Windsor | Windsor West |
| Ontario. Ministry of Transportation - Enforcement, Driver and Vehicle Field Services | London |
| Ontario. ServiceOntario, Amherstburg Service Counter | Amherstburg |
| Ontario. ServiceOntario, Belle River Service Counter | Belle River (Town of) |
| Ontario. ServiceOntario, Dorwin Plaza Service Counter | Windsor Central |
| Ontario. ServiceOntario, Driver and Motor Vehicle Licensing Office, Health Card Services, Essex Branch Office | Essex (Town of) |
| Ontario. ServiceOntario, Harrow Service Counter | Harrow |
| Ontario. ServiceOntario, Health Card Services | Sarnia |
| Ontario. ServiceOntario, Ingersoll Service Counter | Ingersoll |
| Ontario. ServiceOntario, Leamington Service Counter | Leamington (Town of) |
| Ontario. ServiceOntario, Multi-Service Counter Services, Windsor | Windsor Central |
| Ontario. ServiceOntario, Multi-Service Counter Services, Windsor, Income Tax Clinic | Windsor Central |
| Ontario. ServiceOntario, Norwich Service Counter | Norwich |
| Ontario. ServiceOntario, Oxford - Land Registry Office 41 | Woodstock |
| Ontario. ServiceOntario, Pickwick Service Counter | Windsor East |
| Ontario. ServiceOntario, Sarnia | Sarnia |
| Ontario. ServiceOntario, Tillsonburg Service Counter | Tillsonburg |
| Ontario. ServiceOntario, Woodstock Counter Service | Woodstock |
| | Ontario. ServiceOntario - London Counters | London |
| Ontario. ServiceOntario - London Counters, Commissioners Rd | London |
| Ontario. ServiceOntario - London Counters, Dundas St | London |
| Ontario. ServiceOntario - London Counters, Dundas St, Land Registry Office - London | London |
| Ontario. ServiceOntario - London Counters, Dundas St East | London |
| Ontario. ServiceOntario - London Counters, Wharncliffe Rd | London |
| Ontario. ServiceOntario - London Counters, York St | London |
| | Ontario. ServiceOntario - Middlesex County Counters | Middlesex County |
| Ontario. ServiceOntario - Middlesex County Counters, Dorchester | Dorchester |
| Ontario. ServiceOntario - Middlesex County Counters, Parkhill | Parkhill |
| Ontario. ServiceOntario - Middlesex County Counters, Strathroy | Strathroy |
| Opal Singles Club Incorporated | Sarnia |
| | Open Doors Drop In Centre, Consumer/Survivor Association of Lambton | Sarnia |
| Operation Sharing, Cynthia Anne Centre for Addictions (The) | Woodstock |
| Operation Sharing, Ingersoll | Ingersoll |
| Operation Sharing, Ingersoll, Foods for Friends | Ingersoll |
| Operation Sharing, Ingersoll, Knapsacks for Kids | Ingersoll |
| Operation Sharing, Ingersoll, Meeting Place Drop In Centres (The) | Ingersoll |
| Operation Sharing, Ingersoll, My Neighbour's Closet | Ingersoll |
| Operation Sharing, Inn out of the Cold | Woodstock |
| Operation Sharing, Woodstock | Woodstock |
| Operation Sharing, Woodstock, Christmas Place Store | Woodstock |
| Operation Sharing, Woodstock, Coats for Kids | Woodstock |
| Operation Sharing, Woodstock, Extended Family Project | Woodstock |
| Operation Sharing, Woodstock, Foods for Friends | Woodstock |
| Operation Sharing, Woodstock, Knapsacks for Kids | Woodstock |
| Operation Sharing, Woodstock, Meeting Place Drop In Centres (The) | Woodstock |
| | Operational Stress Injury Social Support - Southwestern Ontario | London |
| | Optimist Club, Chatham, Southwestern Ontario Division, Zone 4 | Chatham |
| | Optimist Club, Delta Alpha Theta - 45054 | Windsor Central |
| | Optimist Club, Forest Glade - Windsor - 45079 | Windsor East |
| | Optimist Club, LaSalle - 45918 | LaSalle |
| Optimist Club, of Chatham Maple City, Club # 45057, Zone 4 | Chatham |
| Optimist Club, Point Edward | Point Edward |
| | Optimist Club, Roseville - Fontainbleu - 45922 | Windsor East |
| | Optimist Club, South Windsor 45213 | Windsor South |
| | Optimist Club, Southwestern Ontario District, Belle River and District | Belle River (Town of) |
| | Optimist Club, Southwestern Ontario District, Essex | Essex (Town of) |
| Optimist Club, Tri County Optimist Club of Chatham, Southwestern Ontario District - Zone 4, Club #45919 | Chatham |
| Optimist Club, Wallaceburg, Southwestern Ontario District - Zone 4, District #45, Club #45245 | Wallaceburg |
| Optimist Club, Wheatley | Wheatley |
| Optimist Club 45011, Blenheim, Southwestern Ontario District - Zone 3 | Blenheim |
| Optimist Club 45179, Ridgetown | Ridgetown |
| | Optimist Club of Dover, Southwestern Ontario District - Zone 4 | Pain Court |
| Optimist Club of Dresden and District, Southwestern Ontario Division - Zone 4 | Dresden |
| | Optimist Clubs - In Lambton County | Lambton County |
| | Optimists Clubs of Chatham-Kent | Chatham-Kent |
| | Oral Health Program | Point Edward |
| Orchard Park Cooperative Homes | Essex |
| Orchard Park Nursery School | London |
| Orchardview Apartments | Arkona |
| Order of the Eastern Star, Blue Bell Chapter 145, Chatham | Chatham |
| Order of the Eastern Star, Essex Chapter 153 | Essex (Town of) |
| | Order of the Eastern Star, Harrow/Kingsville | Kingsville (Town of) |
| Order of the Eastern Star, Jun Chapter 130, Tilbury | Tilbury |
| Order of the Eastern Star, Leamington | Cottam |
| Order of the Eastern Star, Thamesville | Thamesville |
| Order of the Eastern Star - Forest Chapter #116 | Forest |
| Order of the Eastern Star, Britannia #34 | Petrolia |
| Order of the Eastern Star, Edith Cavell Chapter #2 | Sombra |
| Order of the Eastern Star, Victory Chapter #50 | Sarnia |
| Organization For Literacy Sarnia-Lambton, Literacy and Basic Skills | Sarnia |
| Orphaned Kitten Nurseries | LaSalle |
| Orville Wright Pool | Chatham |
| Osteoporosis Canada - London and Thames Valley Chapter | London |
| Ostomy Association | Sarnia |
| Ottawa Street BIA | Windsor Central |
| Our Kids Child Care | Sarnia |
| Our Kids Child Care Lambton Inc. | Sarnia |
| Our Lady of Help Catholic Womens League, Wallaceburg, Holy Redeemer Parish Cluster | Wallaceburg |
| Our Lady of Mercy Parish Hall | Sarnia |
| Our Lady of Mercy Roman Catholic Church | Sarnia |
| Our Lady of Mount Carmel Catholic Church | Windsor South |
| Our Lady of the Atonement Roman Catholic Church | Windsor East |
| Our Lady of Victory Church | Chatham |
| Our Lady Queen of Peace | Sarnia |
| Our Saviours Evangelical Lutheran Church | Chatham |
| Outreach Program | Sarnia |
| Over 55 (London) | London |
| | Overeaters Anonymous | Woodstock |
| | Overeaters Anonymous | Harrow |
| | Overeaters Anonymous - Land Between the Lakes Intergroup | London |
| | Owen James Communications Inc, InRetro Magazine/InRetro Radio | Lakeshore |
| Oxford Community Child Care | Woodstock |
| Oxford Community Child Care, Garderie francophone du comté d'Oxford | Woodstock |
| Oxford Community Child Care, Home Child Care Program | Woodstock |
| Oxford Community Child Care, Ingersoll Children's Centre | Ingersoll |
| Oxford Community Child Care, Ontario Early Years Centre, Ingersoll Satellite | Ingersoll |
| Oxford Community Child Care, Ontario Early Years Centre, Tillsonburg Satellite | Tillsonburg |
| Oxford Community Child Care, Ontario Early Years Centre, Woodstock Main Centre | Woodstock |
| Oxford Community Child Care, School Age Program | Woodstock |
| Oxford Community Child Care, Thamesford Preschool | Thamesford |
| Oxford Community Foundation | Woodstock |
| | Oxford County Amateur Radio Club | Woodstock |
| Oxford County Drug Task Force | Ingersoll |
| Oxford County Naval Veterans Association | Woodstock |
| | Oxford County Sledge Hockey Team | Woodstock |
| Oxford County., Community and Strategic Planning | Woodstock |
| Oxford County. Boards and Committees, Accessibility Advisory Committee | Woodstock |
| Oxford County. Corporate Services, Archives | Woodstock |
| Oxford County. Corporate Services, Chief Administrative Office, Clerk's Office | Woodstock |
| Oxford County. Corporate Services, Departments/Offices | Woodstock |
| Oxford County. Corporate Services, Human Resources | Woodstock |
| Oxford County. Corporate Services, Information Systems, GIS / Mapping, Online Interactive Maps | Woodstock |
| Oxford County. Corporate Services, Information Systems, Information Oxford | Woodstock |
| Oxford County. Corporate Services, Library, Brownsville | Brownsville |
| Oxford County. Corporate Services, Library, Burgessville | Burgessville |
| Oxford County. Corporate Services, Library, Embro | Embro |
| Oxford County. Corporate Services, Library, Harrington | Harrington |
| Oxford County. Corporate Services, Library, Ingersoll | Ingersoll |
| Oxford County. Corporate Services, Library, Innerkip | Innerkip |
| Oxford County. Corporate Services, Library, Mount Elgin | Mount Elgin |
| Oxford County. Corporate Services, Library, Norwich | Norwich |
| Oxford County. Corporate Services, Library, Otterville | Otterville |
| Oxford County. Corporate Services, Library, Plattsville | Plattsville |
| Oxford County. Corporate Services, Library, Princeton | Princeton |
| Oxford County. Corporate Services, Library, Tavistock | Tavistock |
| Oxford County. Corporate Services, Library, Thamesford | Thamesford |
| Oxford County. Corporate Services, Library, Tillsonburg | Tillsonburg |
| Oxford County. Corporate Services, Library Headquarters | Ingersoll |
| Oxford County. Corporate Services, Provincial Offences | Woodstock |
| Oxford County. Department of Human Services, Ingersoll Satellite | Ingersoll |
| Oxford County. Department of Human Services, Tillsonburg Satellite | Tillsonburg |
| Oxford County. Department of Human Services, Woodstock | Woodstock |
| Oxford County. Public Health and Emergency Services, Emergency Medical Services | Woodstock |
| Oxford County. Public Health and Emergency Services, Health Promotion, Injury Prevention Team | Woodstock |
| Oxford County. Public Health and Emergency Services, HPV - Human Papillomavirus Vaccination | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Breastfeeding Support Services | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Community Dental Services | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Community Dental Services, Children In Need of Treatment | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Community Dental Services, Healthy Smiles Ontario | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Drinking Water Testing | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Health Matters Line | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Healthy Babies Healthy Children | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Immunization Record Information System | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Immunization Services | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Infectious Disease Prevention & Control | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Inspection | Woodstock |
| | Oxford County. Public Health and Emergency Services, Public Health, Oxford Child Care Guide | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Oxford County Nutritional Partnership | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Prenatal Child Health | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Sexual Health Clinic, Tillsonburg | Tillsonburg |
| Oxford County. Public Health and Emergency Services, Public Health, Sexual Health Clinic, Woodstock | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Stop Smoking Support Services | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Well Baby Clinic | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, Well Baby Clinic, Ingersoll | Ingersoll |
| Oxford County. Public Health and Emergency Services, Public Health, Well Baby Clinic, Tillsonburg | Tillsonburg |
| Oxford County. Public Health and Emergency Services, Public Health, Well Baby Clinic, Woodstock | Woodstock |
| Oxford County. Public Health and Emergency Services, Public Health, What the Health | Woodstock |
| Oxford County. Public Works, Landfill | Salford |
| Oxford County. Public Works Department | Woodstock |
| Oxford County. Woodingford Lodge, Auxiliary Group | Woodstock |
| Oxford County. Woodingford Lodge, Ingersoll | Ingersoll |
| Oxford County. Woodingford Lodge, Tillsonburg | Tillsonburg |
| Oxford County. Woodingford Lodge, Woodstock | Woodstock |
| Oxford Historical Society | Woodstock |
| | Oxford Home Care Services | Otterville |
| Oxford Learning Centre | Windsor East |
| Oxford Learning Centre - London - Byron | London |
| Oxford Learning Centre - London - North | London |
| Oxford Learning Centre - London - South West | London |
| | Oxford Master Aging Plan - 50 Plus Initiative | Tillsonburg |
| Oxford Medical Pharmacy - London - Oxford St E | London |
| Oxford Medical Walk-In Clinic | London |
| Oxford ProResp | Woodstock |
| Oxford Reformed Christian School | Mount Elgin |
| Oxford Self Help Network | Woodstock |
| Oxford Self Help Network, Family Support and Counselling | Woodstock |
| Oxford Small Business Support Centre | Ingersoll |
| Oxford Suicide Prevention Coalition (CMHA Oxford) | Woodstock |
| Oxford Technical Training Centre | Woodstock |
| | Oxford Women in Networking | Woodstock |
| Oxford-Elgin Child and Youth Centre, Adult Protective Services | Woodstock |
| | Oxford-Elgin Child and Youth Centre, Autism Spectrum Disorder Youth Transition Support Program | Woodstock |
| Oxford-Elgin Child and Youth Centre, Counselling Out Client | Woodstock |
| Oxford-Elgin Child and Youth Centre, Crisis Response and Urgent Care | Woodstock |
| Oxford-Elgin Child and Youth Centre, Elgin Office | St Thomas |
| Oxford-Elgin Child and Youth Centre, Group Services for Children and their Caregivers | Woodstock |
| Oxford-Elgin Child and Youth Centre, Ingersoll Satellite | Ingersoll |
| Oxford-Elgin Child and Youth Centre, Intensive Child and Family Services, Schooling, Youth, Intensive In-home and In-school Support Services, Children, Mental Health | Woodstock |
| Oxford-Elgin Child and Youth Centre, Oxford Respite Network | Woodstock |
| Oxford-Elgin Child and Youth Centre, Parents, Kids and Mother Goose Program, Ingersoll | Ingersoll |
| Oxford-Elgin Child and Youth Centre, Parents, Kids and Mother Goose Program, Tillsonburg | Tillsonburg |
| Oxford-Elgin Child and Youth Centre, Parents, Kids and Mother Goose Program, Woodstock | Woodstock |
| Oxford-Elgin Child and Youth Centre, Pittock School Day Treatment Program | Woodstock |
| Oxford-Elgin Child and Youth Centre, Tillsonburg Satellite | Tillsonburg |
| Oxford-Elgin Child and Youth Centre, Walk-In Counselling Service | Woodstock |
| Oxford-Elgin Child and Youth Centre, Woodstock | Woodstock |
| Oxford-Elgin Child and Youth Centre, Youth Justice Program | Woodstock |
| Ozanam Manor | Sarnia |
| Ontario. Ministry of Community and Social Services, Administration Services, Business Office, Windsor | Windsor Central |
| Ontario. Ministry of Community and Social Services, Administration Services, Social and Health Services, Windsor | Windsor Central |
| | Ontario. Ministry of Community and Social Services, Children's Services, Administration Office, Leamington | Leamington (Town of) |
| Ontario. Ministry of Community and Social Services, Children's Services, Child Care Coordination Service, Administration Office, Windsor | Windsor Central |
| Ontario. Ministry of Community and Social Services, Housing Services, Lodging & Rest Home Program, Windsor | Windsor Central |
| Ontario. Ministry of Community and Social Services, Housing Services, Rent Bank, Windsor | Windsor Central |
| Ontario. Ministry of Community and Social Services, Housing Services, Windsor | Windsor Central |
| Ontario. Ministry of Community and Social Services, Ontario Works, Windsor Office | Windsor Central |
| Ontario. Ministry of Community and Social Services, Ontario Works, Leamington District Office | Leamington (Town of) |
| Ontario. Ministry of Community and Social Services, Ontario Works, Employment Resource Centre, Leamington Office | Leamington (Town of) |
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