36 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bourbonnais | 1 | 39,096 | 39,168 | 0.03% | 926 | 42 | Township |
| Kankakee | 2 | 23,894 | 24,469 | -0.17% | 1,331 | 18 | Township |
| Kankakee | 3 | 23,299 | 24,007 | -0.5% | 1,538 | 15 | City |
| Bourbonnais | 4 | 18,076 | 18,096 | -0.02% | 1,942 | 9 | Village |
| Bradley | 5 | 15,255 | 15,383 | -0.14% | 2,097 | 7 | Village |
| Manteno | 6 | 11,330 | 11,210 | 0.35% | 310 | 37 | Township |
| Manteno | 7 | 9,268 | 9,186 | 0.15% | 1,732 | 5 | Village |
| Limestone | 8 | 4,980 | 5,055 | -0.06% | 123 | 40 | Township |
| Aroma | 9 | 4,874 | 4,952 | 0.02% | 131 | 37 | Township |
| Momence | 10 | 3,480 | 3,554 | -0.11% | 82 | 42 | Township |
| Ganeer | 11 | 3,147 | 3,214 | -0.1% | 79 | 40 | Township |
| Momence | 12 | 3,134 | 3,239 | -0.54% | 1,985 | 2 | City |
| Yellowhead | 13 | 2,564 | 2,586 | 0.12% | 58 | 44 | Township |
| Otto | 14 | 2,058 | 2,097 | -0.19% | 43 | 48 | Township |
| Pilot | 15 | 1,956 | 1,985 | 0.05% | 40 | 49 | Township |
| St. Anne | 16 | 1,953 | 1,996 | -0.1% | 65 | 30 | Township |
| Bradley | 17 | 1,915 | 1,899 | 0.63% | 43 | 45 | Township |
| Pembroke | 18 | 1,900 | 1,840 | 1.39% | 36 | 52 | Township |
| Limestone | 19 | 1,513 | 1,546 | -0.33% | 543 | 3 | Village |
| Essex | 20 | 1,501 | 1,486 | 0.13% | 42 | 36 | Township |
| Herscher | 21 | 1,481 | 1,517 | -0.4% | 817 | 2 | Village |
| Grant Park | 22 | 1,278 | 1,289 | -0.16% | 374 | 3 | Village |
| Salina | 23 | 1,216 | 1,238 | -0.08% | 33 | 37 | Township |
| St. Anne | 24 | 1,117 | 1,156 | -0.53% | 1,346 | 1 | Village |
| Norton | 25 | 918 | 937 | -0.11% | 18 | 50 | Township |
| Essex | 26 | 860 | 839 | 0.47% | 370 | 2 | Village |
| Rockville | 27 | 773 | 785 | 0% | 21 | 36 | Township |
| Aroma Park | 28 | 648 | 663 | -0.31% | 344 | 2 | Village |
| Hopkins Park | 29 | 635 | 605 | 0.79% | 152 | 4 | Village |
| Essex | 30 | 574 | 581 | 0.17% | 16 | 36 | Township |
| Bonfield | 31 | 338 | 350 | -0.59% | 687 | 0 | Village |
| Buckingham | 32 | 236 | 241 | -0.42% | 940 | 0 | Village |
| Sammons Point | 33 | 213 | 218 | -0.47% | 115 | 2 | Village |
| Reddick | 34 | 193 | 198 | -0.52% | 808 | 0 | Village |
| Irwin | 35 | 66 | 68 | 0% | 1,467 | 0 | Village |
| Union Hill | 36 | 51 | 53 | 0% | 785 | 0 | Village |
Bourbonnais is the largest city in Kankakee County, with a population of 39,096.
Union Hill is the smallest city in Kankakee County, with a population of 51.
There are 36 cities in Kankakee County, Illinois.