- Umiat
- Umkumiute
- Unga
- Ungalik
- Ungalikthluk
- Upper Slate Creek
- Usibelli
- Utopia
- Uyak
- Uchixsax
- Ugalux
- Ugidak Island
- Ulak Island
- Ulak Island
- Uliaga Island
- Umak Island
- Umnak Island
- Unalaska Island
- Unalga Island
- Ungluchin
- Unglulagan
- Ungluugamax
- Unglux
- Unguchiing Achidan Tanangis
- Unguchiing Hachan Tangingis
- Uuyax
- Uyak Island
- Uzamkum-tanasuu
- Ukak
- Uknavik