U
- Udney
- Udora
- Uffington
- Ufford
- Uhthoff
- Ullswater
- Umfreville
- Underwood
- Uneeda
- Ungers Corners
- Union, Elgin County
- Union, Essex County
- Union, Leeds and Grenville United Counties
- Union Creek
- Union Hall
- Uniondale
- Unionville
- Uphill
- Uplands
- Upper
- Upper Paudash
- Upsala
- Uptergrove
- Ursa
- Utica
- Utopia
- Utterson
- Uttoxeter
- Uxbridge
Read more about this topic: List Of Communities In Ontario