U
- Utopia
- Ungalik
- (Kodiak Island Borough) Uyak
- (Prince of Wales-Hyder Census Area) Ubi Island
- (Lowndes County) Umiat
- Upper Slate Creek
- (Denali Borough) Usibelli
- (Bethel Census Area) Umkumiute
- (Kodiak Island Borough) Ushagat Island
- (Kodiak Island Borough) Uski Island
- (Dillingham Census Area) Ungalikthluk
- Unga
- (Kodiak Island Borough) Utesistoi Island
- (Yukon-Koyukuk Census Area) Utopia Creek
- (Kusilvak Census Area) Utukakarvik
- (Aleutians West Census Area) Uyak Island
- (Aleutians West Census Area) Ungluchin
- (Aleutians West Census Area) Uuyax
- (Aleutians West Census Area) Unguchiing Achidan Tanangis
- (Aleutians West Census Area) Unguchiing Hachan Tangingis
- (Aleutians West Census Area) Uchixsax
- (Aleutians West Census Area) Ungluugamax
- (Aleutians West Census Area) Uzamkum-tanasuu
- (Aleutians West Census Area) Unglux
- (Aleutians West Census Area) Unglulagan
- (Aleutians West Census Area) Ugalux
- (Campbell County) Unga Island
- (Kodiak Island Borough) Uganik (historical)
- (Sitka City and Borough) Ulinoi Island
- (Prince of Wales-Hyder Census Area) Ulloa Island