| PAL Stratford | Stratford |
| Palmerston Snow Kings | Palmerston |
| ParaMed Home Health Care, Stratford | Stratford |
| Parents for Children's Mental Health, Stratford Chapter | Stratford |
| Parks Lawn Bowling Club | St Marys |
| Partners in Employment, Listowel, Ontario Employment Services, Listowel | North Perth |
| Partners in Employment, St Marys, Ontario Employment Services, St Marys | St Marys |
| Partners in Employment, Stratford, Ontario Employment Services, Stratford | Stratford |
| Pass It On Store | St Marys |
| PC Connect, Public Transit Service | Stratford |
| Period Poverty Task Force, Various Sites | |
| Perth Adult Life Care Residences | North Perth |
| Perth Care for Kids, Before and After School Program, Milverton Public School - 68 Mill St | Perth East |
| Perth Care for Kids, Before and After School Program, Site A - 177A Frances St, Mitchell | West Perth |
| Perth Care for Kids, Child Care Centre - 177 Frances St, Mitchell, Child Care Centre | West Perth |
| Perth Care for Kids, Child Care Centre - 177 Frances St, Mitchell | West Perth |
| Perth Care for Kids, Milverton Public School - 68 Mill St, Nursery School | Perth East |
| Perth Care for Kids, Nursery School, Site A - 177A Frances St, Mitchell | West Perth |
| Perth Care for Kids, Upper Thames Elementary, Mitchell - 165 Frances St, Before and After School Program | West Perth |
| Perth Care for Kids, West Perth & Perth East EarlyON, Various Sites | |
| Perth Community Futures Development Corporation | Stratford |
| Perth County Coalition | Stratford |
| Perth County Federation of Agriculture, Mailing Address | |
| Perth County Flying Club | Stratford |
| Perth County Holstein Club | Stratford |
| Perth County Information Network | Perth East |
| Perth County Players, No Physical Address | Stratford |
| Perth County Plowmen's Association | Stratford |
| Perth County Soil and Crop Improvement Association, Environmental Farm Plan, No Physical Address | |
| Perth County Soil and Crop Improvement Association, No Physical Address | Perth County |
| Perth County Soil and Crop Improvement Association, Sustainable Canadian Agricultural Program (Sustainable CAP), No Physical Address | |
| Perth County. Municipal Office, Ontario Court of Justice. Provincial Offences Office | Stratford |
| Perth County. Municipal Office, Perth County Paramedic Services Headquarters, Perth County Paramedic Services | Stratford |
| Perth County. Municipal Office | Stratford |
| Perth East Public Library, Children's Programs, Milverton | Perth East |
| Perth East Public Library, Milverton | Perth East |
| Perth East. Municipal Office, Fire Department, Milverton - Mill St E | Perth East |
| Perth East. Municipal Office, Milverton - Mill St E, Municipal Office | Perth East |
| Perth East. Municipal Office, Perth East Recreation Complex | Perth East |
| Perth East. Municipal Office, Perth East Recreation Complex, Perth East Youth Action Council | Perth East |
| Perth Elder Abuse Committee, Online / Web Service | Stratford |
| Perth South. Municipal Office, St. Pauls - Road 122 | Perth South |
| Perth Veterinary Services | Stratford |
| Perth-Huron Builders Association, Mailing Address | Stratford |
| PFLAG Canada, Waterloo-Wellington-Perth Chapter | Ontario |
| PFLAG Canada - Stratford ON Chapter, No Physical Address | Stratford |
| Picture Perfect Learning Solutions | |
| Pine River Institute | Shelburne |
| Pineridge Snowmobile Club, No Physical Address | |
| Playmakers! Theatre School | Stratford |
| Poverty to Prosperity (P2P) | Huron County |
| Pregnancy and Infant Loss (PAIL) Network | Whitby |
| PREVNet, Promoting Relationships and Eliminating Violence Network | Canada |
| Prisoners HIV / AIDS Support Action Network, Prisoners HIV/AIDS Support Action Network | Toronto |
| Project Lifesaver | Stratford |
| Prosper Canada | Toronto |
| PTSD The Truth Behind the Smile, CMHA Huron-Perth Peer Community Drop-in - Stratford | Stratford |