| City | Country Codes | Area Codes | Dialing Codes |
|---|
| Maple Valley | +1 | 206 or 253 or 425 | +1 206 or 253 or 425 |
| Marblemount | +1 | 360 | +1 360 |
| Marcus | +1 | 509 | +1 509 |
| Marlin | +1 | 509 | +1 509 |
| Marshall | +1 | 509 | +1 509 |
| Marysville | +1 | 360 or 425 | +1 360 or 425 |
| Matlock | +1 | 360 | +1 360 |
| Mattawa | +1 | 509 | +1 509 |
| Mazama | +1 | 509 | +1 509 |
| Mcchord Afb | +1 | 253 | +1 253 |
| Mccleary | +1 | 360 | +1 360 |
| Mckenna | +1 | 360 | +1 360 |
| Mead | +1 | 509 | +1 509 |
| Medical Lake | +1 | 509 | +1 509 |
| Medina | +1 | 425 | +1 425 |
| Menlo | +1 | 360 | +1 360 |
| Mercer Island | +1 | 206 | +1 206 |
| Mesa | +1 | 509 | +1 509 |
| Metaline | +1 | 509 | +1 509 |
| Metaline Falls | +1 | 509 | +1 509 |
| Methow | +1 | 509 | +1 509 |
| Mica | +1 | 509 | +1 509 |
| Mill Creek | +1 | 425 | +1 425 |
| Milton | +1 | 253 | +1 253 |
| Mineral | +1 | 360 | +1 360 |
| Moclips | +1 | 360 | +1 360 |
| Mohler | +1 | 509 | +1 509 |
| Monitor | +1 | 509 | +1 509 |
| Monroe | +1 | 360 or 425 | +1 360 or 425 |
| Montesano | +1 | 360 | +1 360 |
| Morton | +1 | 360 | +1 360 |
| Moses Lake | +1 | 509 | +1 509 |
| Mossyrock | +1 | 360 | +1 360 |
| Mount Vernon | +1 | 360 | +1 360 |
| Mountlake Terrace | +1 | 206 or 425 | +1 206 or 425 |
| Moxee | +1 | 509 | +1 509 |
| Mukilteo | +1 | 206 or 425 | +1 206 or 425 |
| Naches | +1 | 509 | +1 509 |
| Nahcotta | +1 | 360 | +1 360 |
| Napavine | +1 | 360 | +1 360 |
| Naselle | +1 | 360 | +1 360 |
| Neah Bay | +1 | 360 | +1 360 |
| Neilton | +1 | 360 | +1 360 |
| Nespelem | +1 | 509 | +1 509 |
| Newman Lake | +1 | 509 | +1 509 |
| Newport | +1 | 509 | +1 509 |
| Nine Mile Falls | +1 | 509 | +1 509 |
| Nooksack | +1 | 360 | +1 360 |
| Nordland | +1 | 360 | +1 360 |
| North Bend | +1 | 425 | +1 425 |
Others Dialing Codes, Country Codes and Area Codes
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