Collection place
- Uncertain tomb, Cemetery 500, El Ahaiwah2
- Uncertain tomb, Cemetery 500-900, Naga-ed-Der3
- Uncertain tomb, Cemetery 7000, Naga-ed-Der391
- Uncertain tomb, Cemetery 9000, Naga-ed-Der6
- Ungava, Quebec, Canada9
- Unidentified Tusayan cave, Apache County, Arizona1
- Unincorporated central Contra Costa County, California98
- Unincorporated eastern Alameda County, California164
- Unincorporated eastern Contra Costa County, California898
- Unincorporated western Contra Costa County, California3,257
- Union County, New Mexico6
- Union Island, San Joaquin County, California96
- United Kingdom1,741
- United States415,172
- University Indian Ruin, Pima County, Arizona8
- University of British Columbia, Vancouver, British Columbia107
- University of California Santa Cruz, Santa Cruz County, California7
- Unión de San Antonio, Jalisco4
- Unknown Borough, Alaska72
- Unknown locations, United States44