| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Ma and Pas Mobile Home Park | city | Washington | United States | 46.38 | -124.05 | 3 | |
| Mabana | city | Washington | United States | 48.09 | -122.42 | 0 | |
| Mabton | city | Washington | United States | 46.21 | -120.00 | 830 | |
| Machias | city | Washington | United States | 47.98 | -122.05 | 200 | |
| Machias Mobile Manor | city | Washington | United States | 47.99 | -122.03 | 200 | |
| Mack | city | Washington | United States | 46.91 | -118.19 | 1669 | |
| Madison Park | city | Washington | United States | 47.63 | -122.28 | 6 | |
| Madrona | city | Washington | United States | 47.61 | -122.30 | 190 | |
| Madrona Beach | city | Washington | United States | 48.22 | -122.53 | 200 | |
| Madrona Beach | city | Washington | United States | 47.07 | -123.02 | 3 | |
| Madrona Heights | city | Washington | United States | 47.69 | -122.56 | 88 | |
| Madrona Mobile Home Park | city | Washington | United States | 47.14 | -123.10 | 200 | |
| Madrona Point | city | Washington | United States | 47.58 | -122.68 | 3 | |
| Madrona Ridge Mobile Home Park | city | Washington | United States | 47.65 | -122.66 | 190 | |
| Madson | city | Washington | United States | 46.82 | -117.09 | 2598 | |
| Mae | city | Washington | United States | 47.12 | -119.40 | 1158 | |
| Magallon | city | Washington | United States | 46.59 | -118.48 | 830 | |
| Magnolia Beach | city | Washington | United States | 47.38 | -122.48 | 0 | |
| Magnolia Bluff | city | Washington | United States | 47.65 | -122.40 | 200 | |
| Magnolia Heights | city | Washington | United States | 47.27 | -122.60 | 203 | |
| Majestic Mobile Manor | city | Washington | United States | 47.21 | -122.33 | 98 | |
| Malaga | city | Washington | United States | 47.37 | -120.20 | 830 | |
| Malden | city | Washington | United States | 47.23 | -117.47 | 2509 | |
| Malo | city | Washington | United States | 48.80 | -118.61 | 2509 | |
| Malo Trailer Court | city | Washington | United States | 48.81 | -118.60 | 2509 | |
| Malone | city | Washington | United States | 46.96 | -123.33 | 200 | |
| Malott | city | Washington | United States | 48.28 | -119.71 | 856 | |
| Maltby | city | Washington | United States | 47.81 | -122.11 | 400 | |
| Manchester | city | Washington | United States | 47.56 | -122.54 | 0 | |
| Manette | city | Washington | United States | 47.57 | -122.61 | 0 | |
| Manito | city | Washington | United States | 47.51 | -117.13 | 2598 | |
| Manitou | city | Washington | United States | 47.72 | -122.26 | 265 | |
| Manitou | city | Washington | United States | 47.20 | -122.49 | 291 | |
| Manitou Beach | city | Washington | United States | 47.66 | -122.51 | 0 | |
| Mann | city | Washington | United States | 47.61 | -122.30 | 213 | |
| Manning | city | Washington | United States | 46.93 | -117.41 | 1998 | |
| Manor | city | Washington | United States | 45.75 | -122.60 | 213 | |
| Manor Heights Mobile Home Park | city | Washington | United States | 47.85 | -122.29 | 830 | |
| Manor Mobile Home Park | city | Washington | United States | 47.17 | -122.48 | 298 | |
| Mansfield | city | Washington | United States | 47.81 | -119.64 | 2509 | |
| Mansford | city | Washington | United States | 48.31 | -121.52 | 830 | |
| Manson | city | Washington | United States | 47.88 | -120.16 | 1099 | |
| Manthey's Country Mobile Home Park | city | Washington | United States | 48.85 | -122.53 | 59 | |
| Manzanita | city | Washington | United States | 47.68 | -122.56 | 65 | |
| Manzanita | city | Washington | United States | 47.35 | -122.47 | 0 | |
| Maple Beach | city | Washington | United States | 49.00 | -123.04 | 3 | |
| Maple Falls | city | Washington | United States | 48.92 | -122.08 | 830 | |
| Maple Grove | city | Washington | United States | 48.08 | -123.71 | 830 | |
| Maple Grove Beach | city | Washington | United States | 48.25 | -122.52 | 400 | |
| Maple Hills | city | Washington | United States | 47.47 | -122.07 | 830 | |
| Maple Lane Mobile Home Court | city | Washington | United States | 47.36 | -122.23 | 160 | |
| Maple Leaf | city | Washington | United States | 47.69 | -122.32 | 354 | |
| Maple Valley | city | Washington | United States | 47.39 | -122.05 | 830 | |
| Maple Valley Heights | city | Washington | United States | 47.45 | -122.09 | 285 | |
| Maplecreek | city | Washington | United States | 47.79 | -120.14 | 1669 | |
| Maplewood | city | Washington | United States | 47.47 | -122.16 | 364 | |
| Maplewood | city | Washington | United States | 47.40 | -122.56 | 200 | |
| Maplewood Heights | city | Washington | United States | 47.48 | -122.15 | 200 | |
| Mar A Villa Mobile Home Park | city | Washington | United States | 47.39 | -122.29 | 387 | |
| Marble | city | Washington | United States | 48.85 | -117.90 | 1669 | |
| Marblemount | city | Washington | United States | 48.53 | -121.45 | 252 | |
| Marcellus | city | Washington | United States | 47.23 | -118.41 | 1965 | |
| Marcus | city | Washington | United States | 48.66 | -118.07 | 1669 | |
| Marengo | city | Washington | United States | 47.03 | -118.19 | 1699 | |
| Marengo | city | Washington | United States | 46.44 | -117.75 | 1765 | |
| Marietta | city | Washington | United States | 48.79 | -122.58 | 3 | |
| Marietta Mobile Home Court | city | Washington | United States | 47.95 | -124.38 | 354 | |
| Marine Drive | city | Washington | United States | 47.59 | -122.68 | 3 | |
| Mariner Village Mobile Home Park | city | Washington | United States | 47.89 | -122.24 | 830 | |
| Marketown | city | Washington | United States | 48.33 | -122.67 | 298 | |
| Markham | city | Washington | United States | 46.91 | -124.00 | 29 | |
| Marks Mobile Home Park | city | Washington | United States | 47.81 | -122.32 | 400 | |
| Marlin | city | Washington | United States | 47.41 | -118.99 | 1669 | |
| Marmac | city | Washington | United States | 47.11 | -123.14 | 236 | |
| Marrowstone | city | Washington | United States | 48.05 | -122.69 | 49 | |
| Marshall | city | Washington | United States | 47.56 | -117.50 | 2509 | |
| Marshville (historical) | city | Washington | United States | 47.05 | -122.91 | 45 | |
| Martell Mobile Manor | city | Washington | United States | 47.50 | -122.63 | 298 | |
| Martha Lake | city | Washington | United States | 47.85 | -122.24 | 830 | |
| Martha Lake Mobile Manor | city | Washington | United States | 47.86 | -122.24 | 830 | |
| Martin | city | Washington | United States | 47.28 | -121.32 | 2729 | |
| Martindale | city | Washington | United States | 46.24 | -118.96 | 337 | |
| Maryhill | city | Washington | United States | 45.69 | -120.81 | 200 | |
| Marys Corner | city | Washington | United States | 46.55 | -122.82 | 830 | |
| Marysville | city | Washington | United States | 48.05 | -122.18 | 19 | |
| Mason City | city | Washington | United States | 47.97 | -118.97 | 1991 | |
| Mason City (historical) | city | Washington | United States | 47.95 | -118.97 | 1669 | |
| Mathews Corner | city | Washington | United States | 46.46 | -119.19 | 898 | |
| Matlock | city | Washington | United States | 47.24 | -123.41 | 830 | |
| Mats Mats | city | Washington | United States | 47.94 | -122.69 | 216 | |
| Mattawa | city | Washington | United States | 46.74 | -119.90 | 830 | |
| Matthew | city | Washington | United States | 46.56 | -118.54 | 830 | |
| Matthews Beach | city | Washington | United States | 47.71 | -122.28 | 124 | |
| Matthiesen (historical) | city | Washington | United States | 47.77 | -119.66 | 2509 | |
| Maud | city | Washington | United States | 48.33 | -118.08 | 2509 | |
| Maury | city | Washington | United States | 47.39 | -122.38 | 36 | |
| Maxwelton | city | Washington | United States | 47.94 | -122.44 | 295 | |
| May Creek | city | Washington | United States | 47.85 | -121.67 | 232 | |
| May Creek | city | Washington | United States | 47.53 | -122.20 | 134 | |
| May Junction | city | Washington | United States | 46.55 | -119.39 | 830 | |
| May Valley Manor Mobile Home Park | city | Washington | United States | 47.50 | -122.12 | 830 | |
| Mayfield | city | Washington | United States | 46.51 | -122.57 | 830 | |
| Maynard | city | Washington | United States | 48.00 | -122.88 | 3 | |
| Mays (historical) | city | Washington | United States | 46.64 | -123.18 | 830 | |
| Maytown | city | Washington | United States | 46.90 | -122.94 | 209 | |
| Mayview | city | Washington | United States | 46.63 | -117.47 | 2509 | |
| Maywood | city | Washington | United States | 47.23 | -121.64 | 1669 | |
| Mazama | city | Washington | United States | 48.59 | -120.40 | 2509 |