- Mountain View
- Mountain View Estates Mobile Home Park
- Madson
- Manning
- McCoy
- Mockonema
- Moses
- Midvale
- Mabton
- Machias
- Maltby
- Maple Falls
- Maple Valley
- Marblemount
- Marcus
- Marrowstone
- Martha Lake
- Maryhill
- Marysville
- Mattawa
- May Creek
- McCleary
- Meadow Glade
- Medical Lake
- Mercer Island
- Metaline
- Metaline Falls
- Mill Creek
- Mill Plain
- Millwood