J
- Jackfish
- Jack Lake, Peterborough County
- Jack Lake, Simcoe County
- Jackson
- Jacksonburg
- Jackson's Point
- Jaffa
- Jaffray Melick
- Jamestown
- Jamot
- Janetville
- Jarratt
- Jarvis
- Jasper
- Jeannette
- Jeannettes Creek
- Jefferson
- Jellicoe
- Jellyby
- Jericho
- Jermyn
- Jerseyville
- Jessopville
- Jessups Falls
- Jevins
- Jewellville
- Jocelyn
- Jockvale
- Joes Lake
- Jogues
- Johnsons Ferry
- Johnston Corners
- Johnstown, Hastings County
- Johnstown, Leeds and Grenville United Counties
- Jones
- Jones Falls
- Jordan
- Jordan Harbour
- Jordan Station
- Josephburg
- Joyceville
- Joyland Beach
- Joyvista Estates
- Juddhaven
- Judgeville
- Junetown
- Juniper Island
- Jura
Read more about this topic: List Of Communities In Ontario