| P4P Planning Network, P4P | Toronto |
| Pack a Bag for a Friend Foundation | Milton |
| PACT for Halton | Burlington |
| Pain Care Clinics, Non-Cancer Pain Treatment | Oakville |
| Pakmen Volleyball Club | Milton |
| Palermo Hammer Fastball Club | Burlington |
| Palermo United Church | Oakville |
| Palermo Village Retirement Residence | Oakville |
| Palmer Place | Burlington |
| Palms Medical Centre, Family Medicine and Walk-in Clinic | Oakville |
| Palms Pharmacy, Pharmacy Services | Oakville |
| Parachute, Toronto | Toronto |
| ParaMed, In-Home Care Services | Oakville |
| Pardons Canada, Toronto, Information and Telephone Support Line | Toronto |
| Parent Finders Ottawa | Ottawa |
| Parents for Children's Mental Health, Burlington Chapter, Parent Peer Support Group | Burlington |
| Parents for Children's Mental Health, Oakville Chapter, Peer Support Group | Oakville |
| Park Avenue Manor Retirement Community | Burlington |
| Parkinson Canada, Burlington Support Groups | Burlington |
| Parkinson Canada, Oakville Support Group | North York Central |
| Parkinson Canada, Halton Hills Support Group | Halton Hills |
| Parkinson Canada | North York |
| Parkside Rest Home, Group home | Halton Hills |
| Parkview Children's Centre, Oakville - St Gregory the Great School, Licensed Child Care Centre | Oakville |
| Parkview Children's Centre, Burlington - The Orchard School, Licensed Child Care Centre | Burlington |
| Parkview Children's Centre, Milton - Rattlesnake Point Public School, Licensed Child Care Centre | Milton |
| Parkview Children's Centre, Oakville - The Village School, Licensed Child Care Centre | Oakville |
| Paroisse Saint-Philippe, French Church Services | Burlington |
| Parole Board of Canada, Clemency and Record Suspension | Ottawa |
| Parole Board of Canada, Victim Information Service | Ottawa |
| Patient Ombudsman | Toronto Downtown Central |
| Patronato INCA Canada, Patronato INCA Canada, Toronto Office | Toronto |
| PCHS, PCHS Brampton | Brampton |
| PCHS, PCHS Mississauga | Mississauga |
| Peace of Mind Montessori School, Licensed Child Care Centre | Oakville |
| Peak Home Health Care | Oakville |
| Peak Sleep, Burlington, Sleep Study and Consultation | Burlington |
| Peak Sleep, Oakville, Sleep Study and Consultation | Oakville |
| Pearl & Pine Retirement | Burlington |
| Pearson Community Co-operative Nursery School, Licensed Child Care Centre | Burlington |
| Pediatric Oncology Group of Ontario | Toronto Downtown Central |
| Pediatric Urgent Care, Walk-in Medical Clinic | Oakville |
| Peel Halton Workforce Development Group | Mississauga |
| Peel/Halton Co-operative Housing Federation, Mississauga, Co-operative Housing Supports and Services | Mississauga |
| Peel-Halton-Dufferin Adult Learning Network, Literacy and Basic Skills Support Program | Mississauga |
| Period Pin | Ontario |
| Personal Aid Nurse and Home Care, Mailing Address, In Home Care Services | Burlington |
| Pet FBI, Lost and Found Pets Reporting | Ontario |
| Pflag Canada, Pflag Halton | Milton |
| PharmaChoice, Georgetown - 99 Sinclair Ave (Professional Arts Pharmacy), Pharmacy Services | Halton Hills |
| PharmaChoice, Oakville (Palermo Pharmacy), Pharmacy Services | Oakville |
| PharmaChoice, Milton - Bronte St S (Main and Bronte Pharmacy), Pharmacy Services | Milton |
| PharmaChoice - Acton (Acton-Halton Pharmacy), Pharmacy Services | Halton Hills |
| PharmaEssence Drug Mart, Pharmacy Services | Halton Hills |
| Pharmasave, Burlington - Burloak Dr, Pharmacy Services | Burlington |
| Pharmasave, Burlington - Plains Rd W, Pharmacy Services | Burlington |
| Pharmasave, Burlington - Thomas Alton Blvd, Pharmacy Services | Burlington |
| Pharmasave, Georgetown (MedTrust Pharmacy), Pharmacy Services | Halton Hills |
| Pharmasave, Milton (Holly Pharmacy), Pharmacy Services | Milton |
| Pharmasave, Oakville - Upper Middle Rd W (Fairways Pharmasave), Pharmacy Services | Oakville |
| Pharmasave, Oakville (Dundas Neyagawa), Pharmacy Services | Oakville |
| Pharmasave, Milton (Tremaine Pharmacy), Pharmacy Services | Milton |
| Pharmasave, Oakville (Speers Pharmacy), Pharmacy Services | Oakville |
| Pharmasave, Acton, Pharmacy Services | Halton Hills |
| Pharmasave, Milton (LiveYoung Pharmacy), Pharmacy Services | Milton |
| Pharmasave Walkers New Pharmacy & Compounding Centre, Burlington - Walkers Line, Pharmacy Services | Burlington |
| Pharmasave WinCare Pharmacy & Compounding Centre, Burlington - Guelph Line, Pharmacy Services | Burlington |
| PharmaSense, Oakville - Westoak Trails Blvd, Pharmacy Services | Oakville |
| Pharmex Direct, Pharmacy Services | Oakville |
| Phoenix Medical Centre | Clarkson |
| Phoenix Pharmacy, Pharmacy Services | Clarkson |
| Pineland Baptist Church | Burlington |
| PKD Foundation of Canada | Etobicoke Central |
| Plainsview Pharmacy, Pharmacy Services | Burlington |
| Plan International Canada | Toronto |
| Playbox Nursery School, Licensed Child Care Centre | Oakville |
| Plenty Canada | Lanark Highlands |
| Polish National Union of Canada | Burlington |
| Polycultural Immigrant and Community Services, Polycultural Immigrant and Community Services, Mississauga Office | Mississauga |
| Port Nelson United Church | Burlington |
| Portico Community Church | Milton |
| Positive Health Network, Oakville - Kerr St, Supports, Education and Training | Oakville |
| Positive Minds Daycare, Licensed Child Care Centre | Oakville |
| Postmaster Medical Clinic, Family Practice and Walk-in Clinic | Oakville |
| Postpartum Support International, Greater Toronto Chapter, Postpartum Mood Disorder Services | Toronto |
| Poverty Free Halton, Poverty Action Group | Burlington |
| Precious Pearls Child Care Centre, Licensed Child Care Centre | Oakville |
| Pregnancy and Infant Loss (PAIL) Network | |
| Preschool Petit Bateau Milton, Licensed Child Care Centre | Milton |
| Prestige Montessori School, Licensed Child Care Centre | Oakville |
| Prime Care After Hours Walk-in Clinic | Milton |
| Prime Care Family Health Team | Milton |
| Prime Care Family Health Team, Milton - 470 Bronte St S, Suite 200, Family and Community Health | Milton |
| Prime Care Family Health Team, Milton - 470 Bronte St S, Suite 206, Family and Community Health | Milton |
| Prime Care Family Health Team, Milton - 6990 Derry Rd, Suite 102, Family and Community Health | Milton |
| Prime Care Family Health Team, Milton - 6990 Derry Rd, Suite 201, Family and Community Health | Milton |
| Prime Care Family Health Team, Milton - Commercial St, Family and Community Health | Milton |
| Prime Care Family Health Team, Milton - Laurier Ave, Family and Community Health | Milton |
| Prime Earth, Youth Empowerment & Environmental Conservation Organization | Burlington |
| Prince of Peace Lutheran Church | Burlington |
| PrinceRx Kingsridge Pharmacy, Pharmacy Services | Oakville |
| Pro Bono Ontario, Canadian Legal Support for Ukrainians | Toronto |
| Pro Bono Ontario, Medical Legal Partnership for Children | Toronto |
| Pro Bono Ontario | Toronto |
| Pro Bono Students Canada, The Family Justice Centre | Kingston |
| Probus Canada, Online Service, Find a Probus Club | Ontario |
| Project Autism Canada | Halton Region |
| Project Linus Canada, Burlington Chapter - No Physical Address | Burlington |
| ProResp/Trillium Health Partners, Oakville, Community Respiratory Care | Oakville |
| Prosper Canada, Toronto | Toronto |
| Prostate Cancer Support - Brampton, Wellspring Chinguacousy Cancer Support Centre | Brampton |
| Prostate Cancer Support Canada, Burlington/Hamilton Support Group | Burlington |
| Prostate Cancer Support Oakville/Mississauga | Oakville |
| Protecting Escarpment Rural Land | Burlington |
| Providence Baptist Church, Burlington | Burlington |
| Provis-Rudd Clinic, Oakville, Endoscopy and Gastroenterology | Oakville |
| PSW to the Rescue | Oakville |
| Psychiatric Patient Advocate Office, Patient Advocacy, Education and Information | Toronto |
| pt Health, Burlington - Advance Physiotherapy, Physiotherapy Services | Burlington |
| Public Computer Access, Fax, Scanner and Wireless Internet, Burlington | Burlington |
| Public Computer Access, Fax, Scanner and Wireless Internet, Milton | Milton |
| Public Health Agency of Canada, Stop Family Violence | Ottawa |
