1. Ulysses, Grant, Kansas, USA 
2. Union, Broome, New York, USA (1)
3. Union, New Jersey, USA
4. Union, Union, New Jersey, USA
5. Uniontown, Fayette, Pennsylvania, USA
6. Uniontown, Union, Kentucky, USA
7. Universal City, Bexar, Texas, USA (1)
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8. University City, St Louis, Missouri, USA
9. University Park, Dallas, Texas, USA
10. unknown
11. unknown, Bastrop or Fayette County, Texas, USA
12. unknown, Rhenish Prussia/Rheinpreußen/Rhineland/Rheinland, Prussia (Rhineland-Palatinate or Rheinland-Pfalz, Germany)) (2)
13. unknown, Rhineland-Palatinate (Rheinland-Pfalz,), Prussia
14. Unter-Langsehden, Duchy of Courland and Semigallia
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15. Upshur County, Texas, USA
16. Upton County, Texas, USA
17. Upton, Bastrop, Texas, USA (1)
18. USA
19. Uvalde, Uvalde, Texas, USA
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