- Keystone
- Koren
- Kiona
- King Hill
- Kid Valley
- King Corner
- Knapp
- Knapp Landing
- Kumtux
- Karamin
- Kirby
- Kalamut Island (historical)
- Keystone
- Keystone Ferry Landing
- Kanaskat Junction
- Kellogg Island
- Kenilworth
- Kerriston
- Killarney Woods Mobile Home Park
- Kitts Corner
- Klahanie
- Kloshe Illahee Mobile Home Park
- Krain
- Kariotis Mobile Estates
- Kitsap West Mobile Home Court
- Kachess Resort
- Klickitat Heights
- Klickitat Springs
- Klaber
- Klaus