City | 2024 Population |
|---|---|
| Kampsville | 295 |
| Kane | 280 |
| Kaneville | 442 |
| Kangley | 227 |
| Kankakee | 23,335 |
| Kansas | 641 |
| Kappa | 228 |
| Karnak | 397 |
| Kaskaskia | 23 |
| Keene | 595 |
| Keenes | 48 |
| Keensburg | 167 |
| Keith | 370 |
| Keithsburg | 546 |
| Kell | 167 |
| Kelly | 344 |
| Kempton | 175 |
| Kendall | 9,985 |
| Kenilworth | 2,367 |
| Kenney | 309 |
| Kent | 608 |
| Kerr | 149 |
| Kerton | 83 |
| Kewanee | 12,143 |
| Keyesport | 402 |
| Kickapoo | 8,042 |
| Kilbourne | 253 |
| Kildeer | 4,476 |
| Kincaid | 1,301 |
| Kinderhook | 183 |
| King | 199 |
| Kings | 346 |
| Kingston | 112 |
| Kingston Mines | 258 |
| Kinkaid | 454 |
| Kinmundy | 710 |
| Kinsman | 90 |
| Kirkland | 1,608 |
| Kirkwood | 638 |
| Knight Prairie | 540 |
| Knollwood | 1,842 |
| Knox | 4,667 |
| Knoxville | 2,789 |