- Kendall
- Kingston
- Kahlotus
- Kalama
- Kelso
- Kenmore
- Kennewick
- Kent
- Kettle Falls
- Kingsgate
- Kirkland
- Kittitas
- Klickitat
- Kachess Resort
- Kalaloch
- Kalamut Island (historical)
- Kamilche
- Kamloops Island
- Kanaskat
- Kanaskat Junction
- Kangley
- Kapowsin
- Karamin
- Kariotis Mobile Estates
- Keller
- Kellogg Island
- Kellogg Village Mobile Home Park
- Kelly Island
- Kellys Korner
- Kenilworth