G
- (United Counties of Leeds and Grenville) Groveton
- (Peterborough County) Guerin
- (Ottawa) Guildwood Estates
- (Renfrew County) Guiney
- (Lennox and Addington County) Gull Creek
- (Cochrane District) Gull Island
- (District Municipality of Muskoka) Gull Rock
- (Hastings County) Gunter
- (Nipissing District) Gunters
- (Simcoe County) Guthrie
- (Kenora District) Golden
- (Middlesex County) Glencoe
- Gananoque
- (Huron County) Goderich
- Gravenhurst
- Greater Napanee
- (Regional Municipality of Niagara) Grimsby
- (Wellington County) Guelph