- Kinsman
- Kinswept Subdivision
- Kirkland
- Kirksville
- Kirkwood
- Kisch
- Kise Crossing
- Kishwaukee
- Kishwaukee Glen
- Kittredge
- Klines Corner
- Klondike
- Klondike
- Knapp
- Knapps Island
- Knob Hill
- Knoll Creek West
- Knollwood
- Knollwood
- Knollwood Estates Mobile Home Park
- Knox
- Knoxville
- Koops Island
- Koster
- Kritesville
- Kuhn Station
- Kumler
- Kusie Island
- Kylemore
- Kyte Side Estates