- Havre
- Havre North
- Haxby
- Hays
- Heads Trailer Court
- Heart Butte
- Heath
- Hebgen Lake Estates
- Hedgesville
- Helena
- Helena Valley Northeast
- Helena Valley Northwest
- Helena Valley Southeast
- Helena Valley West Central
- Helena West Side
- Helmville
- Henderson
- Heron
- Herron
- Hesper
- Hidden Lake Colony
- Hidden Valley Mobile Estates
- Higgins
- Highland Mobile Home Park
- Highview
- Highwood
- Highwoods Mobile Home Park
- Hildreth
- Hilger
- Hiline Trailer Park