M
- (Prince of Wales-Hyder Census Area) Mushroom Island
- (Sitka City and Borough) Myriad Islands
- (Campbell County) Macks Head Island
- (Kenai Peninsula Borough) Magnet Rock
- (Lowndes County) Maguire Islands
- (Southeast Fairbanks Census Area) Mansfield Village
- (Kodiak Island Borough) Marmot Island
- (Yukon-Koyukuk Census Area) Marten Island
- (Greene County) Martin Islands
- (Lowndes County) Martin Island
- (Campbell County) Mary Island
- (Kodiak Island Borough) Mary Island
- (Kenai Peninsula Borough) Marys Rock
- (Kenai Peninsula Borough) Matushka Island
- (Greene County) Mavis Island
- (Lowndes County) McClure Islands
- (Aleutians West Census Area) McCulloch Rock
- (Kenai Peninsula Borough) McNeil Islet
- (Greene County) Meakerville
- (Campbell County) Mean Rock
- (Yukon-Koyukuk Census Area) Megotsol Island
- (Bethel Census Area) Mellicks Trading Post
- (Yukon-Koyukuk Census Area) Melozi Island
- (Copper River Census Area) Mendeltna Lodge
- (Kenai Peninsula Borough) Mermaid Island
- (Fairbanks North Star Borough) Meridian Island
- (Kodiak Island Borough) Mesa Rocks
- (Yukon-Koyukuk Census Area) Mickey Island
- (Dillingham Census Area) Middle Island
- (Kodiak Island Borough) Middle Island