| P4P Planning Network, P4P | Toronto |
| PACE (Partners in Advanced Cardiac Evaluation), Barrie | Barrie |
| Painswick Garden Club | Barrie |
| Pal Counselling & Associates, Barrie | Barrie |
| Pam Peca Consulting - IBCLC - Lactation Consultant, Pam Peca Consulting | Springwater |
| Paradise Shores by AmandaFritz, Orillia | Orillia |
| ParaMed Home Health Care, Barrie | Barrie |
| Parents Against Racism Simcoe County, Black Fathers Alliance | Barrie |
| Parents Against Racism Simcoe County, Mental Health Support | Barrie |
| Parents Against Racism Simcoe County, Parent Support Group | Barrie |
| Parents Against Racism Simcoe County | Barrie |
| Parents Against Racism Simcoe County, Tutoring Support | Barrie |
| Parents for Children's Mental Health, Simcoe County Chapter | Barrie |
| Parkinson Canada, Support Groups | Barrie |
| Parkinson Canada, Collingwood, Support Groups | Collingwood |
| Parkinson Canada, Midland, Support Groups | Midland |
| Parkinson Canada, Orillia, Support Groups | Orillia |
| Parkview Singers | Barrie |
| Parry Sound Health Centre, First Nations and Inuit Health Branch | Parry Sound |
| Passport Health, Barrie, Barrie Travel Clinic | Barrie |
| Patient / Client and Family Council, Penetanguishene | Penetanguishene |
| PBO Group, Barrie, Prosthetics, Bracing, Orthotics | Barrie |
| Peace Bye Peace, Art Therapy and Counselling Services | Midland |
| Peaceful Transition Inc | Barrie |
| Pearl Vision, Orillia, One Sight Program | Severn |
| Pediatric Oncology Group of Ontario, Orillia, Simcoe County Outreach | Orillia |
| Penetanguishene Centennial Museum and Archives, Penetanguishene Centennial Museum | Penetanguishene |
| Penetanguishene Memorial Community Centre, Sports Hall of Fame, Penetanguishene Sports Hall of Fame | Penetanguishene |
| Penetanguishene Public Library | Penetanguishene |
| Penetanguishene, Town of, Fire and Emergency Services | Penetanguishene |
| Penetanguishene, Town of, Fire and Emergency Services | Penetanguishene |
| Penetanguishene, Town of, Municipal Office | Penetanguishene |
| Penetanguishene, Town of, No physical address, Rest Stations for Extreme Weather Relief | Penetanguishene |
| Penetanguishene, Town of, Parks, Recreation & Culture, Municipal Office | Penetanguishene |
| Penetanguishene, Town of, Penetanguishene Tourist Information Centre, Tourist Information Centre | Penetanguishene |
| PFLAG Canada, No Physical Location, Barrie-Simcoe Chapter | Barrie |
| Pick-L's Nursing Footcare, Mobile Service | Bradford West Gwillimbury |
| Pilipinong Migrante sa Barrie | Barrie |
| Pine River Institute | Shelburne |
| Plan International Canada | Toronto |
| Play Smart Centre, Rama | Chippewas of Rama First Nation |
| Playsmart Centre, Georgian Downs | Innisfil |
| Polish Alliance of Canada Branch 43 Barrie - Angus | Springwater |
| Polish Alliance of Canada Branch 43 Barrie - Angus, Ladies Circle | Springwater |
| Polish Alliance of Canada Branch 43 Barrie - Angus, Barrie | Springwater |
| Precious Paws Rescue | Oro-Medonte |
| Pregnancy and Infant Loss (PAIL) Network | Ontario |
| Pregnancy, Birth and Beyond | Orillia |
| Prevention of Senior Abuse Network - Simcoe County, Barrie - No Physical Address, Prevention of Senior Abuse Network Simcoe County | Barrie |
| Prime Time Club | Wasaga Beach |
| Prince of Peace Anglican Church | Wasaga Beach |
| Prisoners HIV / AIDS Support Action Network, Toronto, Prisoners HIV/AIDS Support Action Network | Toronto |
| Procyon Wildlife Rehabilitation and Education Centre, Procyon Wildlife | Beeton |
| Professional Footcare, Barrie | Barrie |
| Progressive Conservative Party of Ontario, Mailing Address, Barrie-Innisfil Provincial Riding Association | Barrie |
| Progressive Conservative Party of Ontario, Barrie-Springwater-Oro-Medonte Provincial Electoral District Association | Barrie |
| Progressive Training College of Business and Health, Barrie Campus | Barrie |
| Project Lifesaver Simcoe | Barrie |
| Prom Glitz, Barrie | Barrie |
| Property Works | Collingwood |
| Prosper Canada, Financial Empowerment | Toronto |
| Public Health Ontario, Orillia Office, Public Health Ontario, Orillia Office | Orillia |
| Public Services Health and Safety Association | Toronto Downtown |
| Purple Hills Arts & Heritage Society, Station on the Green | Clearview (Simcoe County) |