| City | Country Codes | Area Codes | Dialing Codes |
|---|
| Kent | +1 | 206 or 253 or 425 | +1 206 or 253 or 425 |
| Kettle Falls | +1 | 509 | +1 509 |
| Keyport | +1 | 360 | +1 360 |
| Kingston | +1 | 360 | +1 360 |
| Kirkland | +1 | 206 or 425 | +1 206 or 425 |
| Kittitas | +1 | 509 | +1 509 |
| Klickitat | +1 | 509 | +1 509 |
| La Center | +1 | 360 | +1 360 |
| La Conner | +1 | 360 | +1 360 |
| La Grande | +1 | 360 | +1 360 |
| La Push | +1 | 360 | +1 360 |
| Lacey | +1 | 206 or 360 | +1 206 or 360 |
| Lacrosse | +1 | 509 | +1 509 |
| Lake Stevens | +1 | 360 or 425 | +1 360 or 425 |
| Lakebay | +1 | 253 | +1 253 |
| Lakewood | +1 | 253 | +1 253 |
| Lamona | +1 | 509 | +1 509 |
| Lamont | +1 | 509 | +1 509 |
| Langley | +1 | 360 or 425 | +1 360 or 425 |
| Latah | +1 | 509 | +1 509 |
| Laurier | +1 | 509 | +1 509 |
| Leavenworth | +1 | 360 or 509 | +1 360 or 509 |
| Lebam | +1 | 360 | +1 360 |
| Liberty Lake | +1 | 509 | +1 509 |
| Lilliwaup | +1 | 360 | +1 360 |
| Lincoln | +1 | 509 | +1 509 |
| Lind | +1 | 509 | +1 509 |
| Littlerock | +1 | 360 | +1 360 |
| Long Beach | +1 | 360 | +1 360 |
| Longbranch | +1 | 253 | +1 253 |
| Longmire | +1 | 360 | +1 360 |
| Longview | +1 | 360 | +1 360 |
| Loomis | +1 | 509 | +1 509 |
| Loon Lake | +1 | 509 | +1 509 |
| Lopez Island | +1 | 360 | +1 360 |
| Lummi Island | +1 | 360 | +1 360 |
| Lyle | +1 | 509 | +1 509 |
| Lyman | +1 | 360 | +1 360 |
| Lynden | +1 | 360 | +1 360 |
| Lynnwood | +1 | 206 or 425 | +1 206 or 425 |
| Mabton | +1 | 509 | +1 509 |
| Malaga | +1 | 509 | +1 509 |
| Malden | +1 | 509 | +1 509 |
| Malo | +1 | 509 | +1 509 |
| Malone | +1 | 360 | +1 360 |
| Malott | +1 | 509 | +1 509 |
| Manchester | +1 | 360 | +1 360 |
| Mansfield | +1 | 509 | +1 509 |
| Manson | +1 | 509 | +1 509 |
| Maple Falls | +1 | 360 | +1 360 |
Others Dialing Codes, Country Codes and Area Codes
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