- Memaloose Island
- Menlo
- Menoken
- Mentor
- Mercer Heights
- Mercer Island
- Mercer Island Town
- Meredith
- Meridian
- Meridian
- Meridian Heights
- Meridian Terrace Mobile Manor
- Meridian Village Mobile Home
- Merritt
- Mesa
- Meskill
- Metaline
- Metaline Falls
- Meteor
- Methow
- Metum
- Mica
- Michigan Hill
- Middle Nemah
- Midlakes
- Midland
- Midvale
- Midvale Corner
- Midway
- Midway