- Kane
- Kane Township
- Kaneville
- Kaneville Township
- Kankakee
- Kansas
- Kansas Township
- Karnak Precinct
- Karnak
- Kaskaskia
- Kaskaskia Precinct
- Keenes
- Keithsburg
- Kell
- Kempton
- Kenilworth
- Kenney
- Kent
- Kewanee
- Kewanee township
- Keyesport
- Kilbourne Township
- Kilbourne
- Kincaid
- Kinderhook
- Kinderhook township
- Kingston
- Kingston Township
- Kingston Mines
- Kinmundy
- Kinmundy Township
- Kinsman
- Kirkland
- Kirkwood
- Knoxville