K
- (Ketchikan Gateway Borough) Kelp Island
- (Prince of Wales-Hyder Census Area) Kendrick Islands
- (Madison County) Keku Islets
- (Prince of Wales-Hyder Census Area) Keski Island
- (Ketchikan Gateway Borough) Kestrel Island
- (Yakutat City and Borough) Khantaak Island
- (Perry County) Kidney Island
- (Perry County) Killisnoo Island
- (Perry County) Kinchman Rock
- (Prince of Wales-Hyder Census Area) King Island
- (Sitka City and Borough) Kinky Island
- (Sitka City and Borough) Kirbas Island
- (Sitka City and Borough) Kirushkin Island
- (Juneau City and Borough) Kishbrock Island
- (Sitka City and Borough) Kita Island
- (Ketchikan Gateway Borough) Kite Island
- (Sitka City and Borough) Klag Island
- (Prince of Wales-Hyder Census Area) Klakas Island
- (Prince of Wales-Hyder Census Area) Klawock Island
- (Prince of Wales-Hyder Census Area) Kleiti Islands
- (Prince of Wales-Hyder Census Area) Klinau Island
- (Sitka City and Borough) Kliuchevoi Island
- (Sitka City and Borough) Klokachef Island
- (Yakutat City and Borough) Knight Island
- (Prince of Wales-Hyder Census Area) Knob Island
- (Haines Borough) Kochu Island
- (Prince of Wales-Hyder Census Area) Kluanil Island
- (Sitka City and Borough) Kolash Island
- (Sitka City and Borough) Koka Island
- (Sitka City and Borough) Korga Island