P
- (Rainy River District) Pinewood
- (Simcoe County) Pinkerton
- (Ottawa) Piperville
- (United Counties of Leeds and Grenville) Pittston
- (Comtés unis de Prescott et Russell) Plantagenet Station
- (Ottawa) Playfair Park
- (Lanark County) Playfairville
- (Comtés unis de Prescott et Russell) Pleasant Corners
- (Renfrew County) Pleasant Valley
- (Manitoulin District) Pleasant Valley
- (Renfrew County) Pleasant View
- (Middlesex County) Plover Mills
- (United Counties of Leeds and Grenville) Plum Hollow
- (Algoma) Plummer
- (Bruce County) Point Clark
- (Parry Sound District) Pointe au Baril
- (Parry Sound District) Pointe au Baril Station
- (Algoma) Pointe aux Pins
- (Algoma) Pointe Louise
- (Simcoe County) Point of Mara Beach
- (Parry Sound District) Pomeroy Island
- (Grey County) Pomona
- (Wellington County) Ponsonby
- (Perth County) Poole
- (United Counties of Leeds and Grenville) Pooles Resort
- (Manitoulin District) Poplar
- (Middlesex County) Poplar Hill
- (Cochrane District) Porcupine
- (Parry Sound District) Port Anson
- (Elgin County) Port Burwell