39 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bourbonnais township | 1 | 39,109 | 39,168 | 0.2% | 926 | 42.24 | Township |
| Kankakee township | 2 | 23,780 | 24,473 | -0.36% | 1,324 | 17.95 | Township |
| Kankakee | 3 | 23,168 | 24,005 | -0.72% | 1,530 | 15.14 | City |
| Bourbonnais | 4 | 18,000 | 18,104 | -0.12% | 1,934 | 9.31 | Village |
| Bradley | 5 | 15,184 | 15,381 | -0.26% | 2,191 | 6.93 | Village |
| Manteno township | 6 | 11,196 | 11,205 | 0.12% | 306 | 36.58 | Township |
| Manteno | 7 | 9,168 | 9,192 | -0.05% | 1,713 | 5.35 | Village |
| Limestone township | 8 | 4,949 | 5,051 | -0.22% | 123 | 40.38 | Township |
| Aroma township | 9 | 4,826 | 4,953 | -0.33% | 130 | 37.09 | Township |
| Momence township | 10 | 3,462 | 3,550 | -0.29% | 82 | 42.45 | Township |
| Ganeer township | 11 | 2,990 | 3,081 | -0.4% | 75 | 39.92 | Township |
| Momence | 12 | 2,982 | 3,104 | -0.8% | 1,889 | 1.58 | City |
| Yellowhead township | 13 | 2,561 | 2,591 | 0.16% | 58 | 43.90 | Township |
| Otto township | 14 | 2,063 | 2,095 | -0.05% | 43 | 48.23 | Township |
| St. Anne township | 15 | 1,940 | 1,996 | -0.36% | 64 | 30.25 | Township |
| Pilot township | 16 | 1,935 | 1,982 | -0.26% | 39 | 49.44 | Township |
| Bradley township | 17 | 1,844 | 1,900 | -0.65% | 41 | 44.87 | Township |
| Pembroke township | 18 | 1,803 | 1,834 | -0.11% | 34 | 52.34 | Township |
| Essex township | 19 | 1,507 | 1,488 | 0.53% | 42 | 35.65 | Township |
| Limestone | 20 | 1,505 | 1,547 | -0.53% | 561 | 2.68 | Village |
| Herscher | 21 | 1,468 | 1,517 | -0.68% | 810 | 1.81 | Village |
| Grant Park | 22 | 1,270 | 1,294 | -0.39% | 372 | 3.41 | Village |
| Salina township | 23 | 1,213 | 1,240 | -0.25% | 33 | 36.59 | Township |
| St. Anne | 24 | 1,111 | 1,156 | -0.8% | 1,339 | 0.83 | Village |
| Norton township | 25 | 912 | 942 | -0.55% | 18 | 49.77 | Township |
| Essex | 26 | 862 | 842 | 0.47% | 370 | 2.33 | Village |
| Rockville township | 27 | 766 | 784 | -0.26% | 21 | 36.45 | Township |
| Aroma Park | 28 | 634 | 661 | -0.78% | 337 | 1.88 | Village |
| Hopkins Park | 29 | 576 | 593 | -0.52% | 138 | 4.17 | Village |
| Essex township | 30 | 540 | 579 | -2% | 15 | 36.13 | Township |
| Bonfield | 31 | 337 | 352 | -0.88% | 685 | 0.49 | Village |
| Buckingham | 32 | 235 | 242 | -0.42% | 936 | 0.25 | Village |
| Sammons Point | 33 | 207 | 212 | -0.48% | 112 | 1.85 | Village |
| Reddick | 34 | 191 | 198 | -0.52% | 799 | 0.24 | Village |
| Eagle Lake | 35 | 145 | 61 | 7.41% | 241 | 0.60 | CDP |
| Irwin | 36 | 66 | 68 | 0% | 1,467 | 0.04 | Village |
| Union Hill | 37 | 52 | 54 | 0% | 800 | 0.07 | Village |
| Andres | 38 | 51 | 36 | 6.25% | 429 | 0.12 | CDP |
| Goodenow | 39 | 11 | 81 | 10% | 344 | 0.03 | CDP |
Bourbonnais township is the largest city in Kankakee County, with a population of 39,109.
Goodenow is the smallest city in Kankakee County.
There are 39 cities in Kankakee County, Illinois.