- Ulster
- Union
- Uniontown
- Unionville
- Unity House
- University Park
- Upper Allen Township
- Upper Black Eddy
- Upper Chichester Township
- Upper Darby
- Upper Gwynedd
- Upper Macungie Township
- Upper Makefield Township
- Upper Mount Bethel
- Upper Mt Bethel Township
- Upper Nazareth
- Upper Nazareth Township
- Upper Providence Township
- Upper Salford Township
- Upper Saucon Township
- Upper Southampton Township
- Uwchlan Township