- Upper Arsnicker Keys
- Uceta
- Uceta Gardens
- Uceta Heights
- Uceta Pines
- Uleta
- Ulmerton
- Umatilla
- Umbrella Island
- Umbrella Key
- Underwood Crossing
- Union
- Union Park
- Uniquely Clever LLC
- United Trailer Park
- Unity Circle
- University
- University Lakes Mobile Home Park
- University Park
- University Park
- University Park
- University Square
- University Village
- University Village Mobile Home Park
- University West
- University Woods
- Up the Grove Beach
- Upper Captiva
- Upper Grand Lagoon
- Upper Harbor Key