- Ulmstead Acres
- Ulmstead Cove
- Ulmstead Estates
- Ulmstead Gardens
- Ulmstead Point
- Unicorn
- Unicorn Crossing
- Unicorn Manor
- Union Bridge
- Union Corner
- Union Corners
- Union Hills
- Union Mills
- Union Valley
- Uniontown
- Unionville
- Unionville
- Unionville
- Unionville Heights
- Unity
- University Park
- Upper Crest Estates
- Upper Crossroads
- Upper Fairmount
- Upper Falls
- Upper Ferry Acres
- Upper Ferry Estates
- Upper Hill
- Upper Hooper Island
- Upper Jutland