- Keenbrook
- Kenton Mill
- Klinefelter
- Klondike
- Kramer
- Kramer Hills
- Kentwood-In-The-Pines
- Keddie
- Keeler
- Kelseyville
- Kennedy
- Kensington
- Kentfield
- Kernville
- Kettleman City
- Keyes
- King City
- Kings Beach
- Kingsburg
- Kirkwood
- Klamath
- Knightsen
- Kaba Island
- Kaketan Island
- Kettleman
- King Island
- Ken Mar Gardens Mobile Home Park
- Klau
- Kid Rock
- Keswick