I
- (Wellington County) Inverhaugh
- (Algoma) Iron Bridge
- (Simcoe County) Ivy
- (Hastings County) Ivanhoe
- (Middlesex County) Ivan
- (District Municipality of Muskoka) Isle of Skye
- (Frontenac County) Isle of Man
- (Haliburton County) Ironsides
- (Haliburton County) Irondale
- (Grey County) Irish Lake
- (Elgin County) Iona Station
- (Elgin County) Iona
- (Lambton County) Inwood
- (District Municipality of Muskoka) Inverness Lodge
- (Elgin County) Invererie Heights
- (Ottawa) Innes Park
- (Parry Sound District) Inholmes
- (Haliburton County) Ingoldsby
- (Grey County) Inglis Falls
- (Lennox and Addington County) Ingle
- (Peterborough County) Indian River
- (Middlesex County) Ilderton
- (Kenora District) Ignace
- (Frontenac County) Ida Hill
- (Peterborough County) Ida
- Iroquois Falls
- Innisfil
- Ingersoll