J
- (Sitka City and Borough) John Rock
- (Sitka City and Borough) Jug Island
- (Perry County) Junction Island
- (Juneau City and Borough) Juneau Island
- (Ketchikan Gateway Borough) Just Island
- (Prince of Wales-Hyder Census Area) Jumbo Island
- (Campbell County) John Rock
- (Sumter County) Jackpot Island
- (Yukon-Koyukuk Census Area) Jackson Island
- (Lake and Peninsula Borough) Jacob Island
- (Kenai Peninsula Borough) Jakolof Bay
- (Lake and Peninsula Borough) James Island
- (Lowndes County) Jeanette Island
- (Yukon-Koyukuk Census Area) Jennie M Island
- (Sumter County) Jenny Islands
- (Yukon-Koyukuk Census Area) Jenny Island
- (Yukon-Koyukuk Census Area) Jimmy Island
- (Yukon-Koyukuk Census Area) Joe Guay Island
- (Yukon-Koyukuk Census Area) Joe Devlin Island
- (Prince of Wales-Hyder Census Area) Jackson Island
- (Kodiak Island Borough) John Island
- (Campbell County) John Rock
- Juneau