K
- (Prince of Wales-Hyder Census Area) Kosciusko Island
- (Madison County) Kousk Island
- (Sitka City and Borough) Krestof Island
- (Sitka City and Borough) Krishka Island
- (Yakutat City and Borough) Kriwoi Island
- (Sitka City and Borough) Krugloi Islands
- (Sitka City and Borough) Krugloi Island
- (Yakutat City and Borough) Krutoi Island
- (Sitka City and Borough) Kruzof Island
- (Prince of Wales-Hyder Census Area) Kubanof Rock
- (Madison County) Kuiu Island
- (Sitka City and Borough) Kulichkof Rock
- (Madison County) Kupreanof Island
- (Prince of Wales-Hyder Census Area) Kussu Islands
- (Sitka City and Borough) Kutchuma Islands
- (Sitka City and Borough) Kutkan Island
- (Campbell County) Kagai Island
- (Aleutians West Census Area) Kagalaska Island
- (Aleutians West Census Area) Kagamil Island
- (Lake and Peninsula Borough) Kak Island
- (Kusilvak Census Area) Kakamut
- (Kusilvak Census Area) Kako Landing
- (Bethel Census Area) Kaksajookalik Island
- (Kusilvak Census Area) Kalak
- (Kenai Peninsula Borough) Kalgin Island
- (Campbell County) Kaligagan Island
- (Yukon-Koyukuk Census Area) Kalka Island
- (Kodiak Island Borough) Kalsin Island
- (Kusilvak Census Area) Kaluchagun Island
- (Aleutians West Census Area) Kamenisti