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- U S Marine Hospital ()
- U-plan buildings (33)
- U. S. Treasury/Mint ()
- U.S. Air Force Base ()
- U.S. Army ()
- U.S. Department of Veteran's Affairs (115)
- U.S. Navy ()
- U.S. Presidents (57)
- U.S.S. Arizona ()
- Udomwech, Parul ()
- Uhl, Charles H. ()
- Uhl, Charles ()
- Uhl, Lauren ()
- ULSG ()
- Umana, Jairo ()
- Umstattd, Lisa ()
- Underground buildings (4)
- underground buildings (4)
- underground railroad system (1)
- Underground Storage ()
- underpasses (7)
- Underpasses (7)
- Underpass ()
- Undertakers Stables ()
- Underwater Test Fac. ()
- Unfinished structures ()
- Union Church ()
- Union Hall ()
- Unit Univ Church ()
- Unitarian Church ()
- Unitarian Universalist churches (20)
- United Meth. Church ()
- United States Army Corp of Engineers ()
- United States Army ()
- Univ Pres House ()
- Universalism (2)
- Universalist Church ()
- University Buildings ()
- University Building ()
- University Classroom ()
- University Hall ()
- University Library ()
- University Pavilion ()
- University (1)
- Unknown. ()
- Unknown ()
- Unload Materials ()
- updraft kilns (1)
- Uranium Metal Manufa ()
- Uranium processing plants (9)
- uranium processing plants (9)
- Uranium Purification ()
- uranium (10)
- urban growth (3)
- Urban parks (11)
- urban parks (11)
- urban renewal (60)
- Urbas, Andrea ()
- Urda, Alan ()
- Urns ()
- US Post Office ()
- Usher, Aaron ()
- Ussler, Christine ()
- utilities (25)
- utility poles (1)
- utility rooms (6)
- Utility Shed ()
- utopias (13)