- Ulster (Population: 12,544)
- Ulysses (Population: 4,775)
- Unadilla (Population: 4,548)
- Union (Population: 56,298)
- Union Springs (Population: 1,074)
- Union Vale (Population: 4,546)
- Uniondale (Population: 23,011)
- University Gardens (Population: 4,138)
- Upper Brookville (Population: 1,801)
- Upper Nyack (Population: 1,863)
- Urbana (Population: 2,546)
- Utica (Population: 60,651)
