| | Organization Name(s) | Located In |
 | Palliative Medicine Program, London and South West LHIN | London |
| | Palliative Pain and Symptom Management Consultation Program Southwestern Ontario, St Joseph's Health Care London | London |
 | Palliative Pain and Symptom Management Consultation Program Southwestern Ontario, St Joseph's Health Care London, London and Middlesex County | London |
 | Palliative Pain and Symptom Management Consultation Program Southwestern Ontario, St Joseph's Health Care London, Oxford and Elgin Counties | London |
 | Pandora Rebekah Lodge, Chapter 42, Blenheim | Blenheim |
 | Para-Med Home Health Care, Community Care Nursing and Personal Support, Windsor Branch | Windsor South |
 | Para-Med Home Health Care, Windsor Branch, Foot Care Services | Windsor South |
 | Para-Med Home Health Care, Windsor Branch, Homecare Services | Windsor Central |
 | Para-Med Home Health Care, Windsor Branch, Respite Home Care | Windsor South |
 | Para-Med Home Health Care, Windsor Branch, Wellness Clinic | Windsor South |
 | Para-Med Home Health Care, Windsor Centre | Windsor South |
 | Parent Finders Windsor-Essex County | Windsor |
| | Parent Guide | London |
 | Parenting and Family Literacy Centre, Ontario Early Years | Sarnia |
 | Parents of Technologically Dependent Children of Ontario - Kids Country Club | London |
 | Parish of the Transfiguration, Church of the Advent, Pastoral Charge | Ridgetown |
 | Park Street Place Retirement Residence, Dresden | Dresden |
 | Parkhill Cooperative Playschool | Parkhill |
 | Parkhill Residential | Parkhill |
 | Parkinson Society Southwestern Ontario | London |
 | Parkinson Society Southwestern Ontario, Support Group, Essex County, Leamington | Leamington |
 | Parkinson Society Southwestern Ontario, Support Group, Essex County, Leamington Parkinsons Exercise and Support Group | Leamington (Town of) |
 | Parkinson Society Southwestern Ontario, Support Group, Essex County, Windsor | Windsor |
| | Parkside Apartments, County of Lambton. Housing Services Department. Watford | Lambton County |
 | Parkside Child Care Centre | Ingersoll |
 | Parkside Restaurant & Cabins | Chatham-Kent |
 | Parkside Tennis Club | Windsor Central |
 | Parkway Pentecostal Church | Corunna |
 | Parkwood Gospel Temple | Windsor East |
 | Parkwood Gospel Temple, Food Bank | Windsor East |
 | Parkwood Gospel Temple, Holiday Programs | Windsor East |
 | Parkwood Gospel Temple, O.P.A.L.S. (Optimistic People With Active Lifestyles) | Windsor East |
 | Parkwood Hospital, NeuroTrauma Rehabilitation Services | London |
 | Parthenon Lodge | Chatham |
 | Participation House Support Services - London and Area | London |
 | Participation House Support Services - London and Area, Community Support Services - Physical and Developmental Disabilities | London |
 | Participation House Support Services - London and Area, Personal Support/Independence Training | London |
 | Participation House Support Services - London and Area, Project Hope | London |
 | Participation House Support Services - London and Area, Supportive Housing | London |
 | Participation House Support Services - London and Area, Supportive Housing - Small | London |
 | Paterson Memorial Presbyterian Church | Sarnia |
| | Pathway to Potential, Windsor Essex County's Poverty Reduction Strategy | Windsor |
 | Pathways Health Centre for Children | Sarnia |
| | Pathways Health Centre for Children | Sarnia |
| | Pathways Health Centre for Children, Physiotherapy Services | Sarnia |
 | Pathways Skill Development and Placement Centre | London |
 | Pathways To Wellness | London |
| | Patient Transfer Service | Windsor |
| | Paul Marley Pharmacy | Wyoming |
 | Paul Reaume Funeral Home, Comber | Comber |
 | Paulin Memorial Presbyterian Church | Windsor South |
 | Peace Lutheran Church | Windsor East |
 | Peace Lutheran Church, Food Bank | Windsor East |
 | Peace Lutheran Church, Food Bank, Holiday Programs | Windsor East |
 | Pebec School of Esthetics | London |
 | Pelee Island Art Works | Pelee Island |
 | Pelee Island Medical Clinic | Pelee Island |
 | Pelee Island Transportation Services, Jiimaan Ferry Service | Pelee Island |
 | Pelee. Municipal Office | Pelee Island |
| | People First London | London |
 | People Management Group | Innerkip |
 | peopleCare Oakcrossing London | London |
 | peopleCare Tavistock | Tavistock |
 | Peoples Church - Wyoming | Wyoming |
 | Percy Heights Co-operative | Woodstock |
 | Performance Fitness and Training | Chatham |
| | Personal Growth Counselling | Point Edward |
 | Personality and Human Relations (PRH) - An International School of Adult Development and Education, Southwestern Ontario | Chatham |
 | Perth East, Township of, Milverton Fire Station | Milverton |
 | Petrolia Friendship Club | Petrolia |
| | Petrolia & District Skating Club | Petrolia |
| | Petrolia & Enniskillen Agricultural Society | Petrolia |
 | Petrolia (Corporation of the Town of) | Petrolia |
 | Petrolia Discovery | Petrolia |
| | Petrolia EMS Base, County of Lambton | Petrolia |
| | Petrolia Farmers' Market | Petrolia |
 | Petrolia Farmers’ Market | Petrolia |
| | Petrolia Heritage Committee | Petrolia |
 | Petrolia Rehabilitation | Petrolia |
 | Petrolia Topic | Petrolia |
| | Petrolia. Mayor | Petrolia |
| | PFLAG Canada - London | London |
| | Pharmasave | Forest |
 | Pharmasave, OHIP covered incontinence and mobility aids | Tilbury |
| | Philips Lifeline | Sarnia |
| | Philips Lifeline, Medical Alert Service | Windsor |
 | Physician Recruitment Taskforce Of Sarnia Lambton | Sarnia |
 | Pillar Nonprofit Network | London |
| | Pillette Village BIA | Windsor East |
 | Pillette Village Walk-in Clinic | Windsor East |
 | Pine Hill Rest Home | St Thomas |
| | Pinery Baptist Church | Grand Bend |
 | Pinetree Montessori School | London |
 | Pineview - Seniors' Apartment Building | Sarnia |
 | Pineview Apartments for Seniors | Sarnia |
 | Place Concorde | Windsor East |
 | Place Concorde, Bilingual Summer Day Camp | Windsor East |
 | Place du Partage | Windsor East |
 | Place du Partage, Downtown Site | Windsor Central |
 | Plan Canada | Toronto |
 | Plattsville and District Young at Heart Club | Plattsville |
 | Plattsville Christian School | Plattsville |
 | Plumbers, Pipefitters & Welders - Local 663, United Association of Journeyman and Apprentices of the Plumbing and Pipefitting Industry of the United States and Canada | Sarnia |
| | Plympton & Wyoming Agricultural Society | |
| | Plympton-Wyoming. Mayor | Plympton-Wyoming |
| | Plympton-Wyoming. Municipal Office | Plympton-Wyoming |
 | Pnyx Baldoon Lodge 312 Af & Am, Wallaceburg | Wallaceburg |
 | Point Edward Before and After School and Summer Program, Point Edward Nursery School | Point Edward |
 | Point Edward Community Hall | Point Edward |
 | Point Edward Early Learning Centre | Point Edward |
| | Point Edward Figure Skating Club | Point Edward |
 | Point Edward Nursery School | Point Edward |
 | Point Edward Presbyterian Church | Point Edward |
 | Point Edward Soccer | Point Edward |
| | Point Edward. Mayor | Point Edward |
| | Point Edward. Municipal Office | Point Edward |
 | Point Pelee National Park | Leamington |
 | Point Pelee National Park, Visitor Centre | Leamington |
 | Polish Alliance of Canada, Branch 14 | Sarnia |
 | Polish Canadian Club, Chatham | Chatham |
 | Polish National Association - London | London |
 | Pollutech EnviroQuatics Limited | Point Edward |
 | Polonia Centre (Windsor) Inc., Administration Office | Windsor East |
 | Pop Can Tabs, Essex County | Kingsville |
 | Port Bruce Manor | |
| | Port Franks Community Centre | Port Franks |
 | Portuguese Canadian Club | Sarnia |
 | Portuguese Canadian Club, Wallaceburg | Wallaceburg |
 | Portuguese Canadian Club of Strathroy | Strathroy |
 | Portuguese Club of London | London |
 | Portuguese-Canadian Social Club of Chatham, Chatham | Chatham |
 | Positive Parenting Windsor, Parenting Classes | Windsor West |
 | Power Attic Gym | Wallaceburg |
| | Practical Solutions Vocational Services | London |
 | Praise Fellowship Church, Chatham, Soup Kitchen | Chatham |
 | Precise Pharmacy | London |
| | Preferred Dental Hygiene Services | London |
 | Pregnancy Centre | Sarnia |
 | Pregnancy Options & Support Centre | Sarnia |
 | Presbyterian Women's Missionary Society Western Division, Dresden | Dresden |
 | Preschool of the Arts | London |
 | Pride C-K | Chatham |
 | Prince Albert Baptist Church, Dresden | Dresden |
 | Princess Family Practice and Walk-in Clinic | Leamington (Town of) |
 | Princeton and District Housing Association | Princeton |
| | Princeton Historical Society | Princeton |
| | Private Tutor | Alvinston |
 | Pro Bono Students Canada, Small Claims Court Project | London |
| | Probus Club of Woodstock-Oxford (The) | Woodstock |
| | Professional Engineers Ontario, Windsor-Essex Chapter | Windsor |
 | Professional Fire Fighters Association, Wallaceburg | Wallaceburg |
 | Professional Respiratory (PRO RESP) | Chatham |
 | Professional Truck Driving Shool | Sarnia |
 | Project Linus | Ingersoll |
| | Project Rachel of the Diocese of London, Post-Abortion Healing and Reconciliation | Windsor |
 | Prostate Cancer and Information Support Group - St Thomas | St Thomas |
| | Prostate Cancer Canada Network, Windsor-Essex | Windsor East |
 | Providence United Church, Pastoral Charge Sprucedale United Church, Sprucedale United Church | Chatham |
 | Psychiatric Patient Advocate Office - London Office | London |
| | Psychiatric Patient Advocate Office - St Thomas Office | St Thomas |
 | Psychiatric Survivors Network of Elgin | St Thomas |
 | Psychiatric Survivors Network of Elgin, Warm Line | St Thomas |
| | Pt Edward Optimist Community Centre | Point Edward |
 | Puce First Baptist Church | Lakeshore |
 | Purple Theatre Company (The) | Windsor West |