39 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bourbonnais | 1 | 39,086 | 39,168 | 0.03% | 925 | 42 | Township |
| Kankakee | 2 | 23,934 | 24,469 | -0.17% | 1,333 | 18 | Township |
| Kankakee | 3 | 23,417 | 24,007 | -0.5% | 1,546 | 15 | City |
| Bourbonnais | 4 | 18,079 | 18,096 | -0.02% | 1,942 | 9 | Village |
| Bradley | 5 | 15,276 | 15,383 | -0.14% | 2,204 | 7 | Village |
| Manteno | 6 | 11,290 | 11,210 | 0.36% | 309 | 37 | Township |
| Manteno | 7 | 9,254 | 9,186 | 0.14% | 1,729 | 5 | Village |
| Limestone | 8 | 4,983 | 5,055 | -0.06% | 123 | 40 | Township |
| Aroma | 9 | 4,873 | 4,952 | 0.02% | 131 | 37 | Township |
| Momence | 10 | 3,484 | 3,554 | -0.11% | 82 | 42 | Township |
| Momence | 11 | 3,151 | 3,239 | -0.57% | 1,996 | 2 | City |
| Ganeer | 12 | 3,150 | 3,214 | -0.1% | 79 | 40 | Township |
| Yellowhead | 13 | 2,561 | 2,586 | 0.12% | 58 | 44 | Township |
| Otto | 14 | 2,062 | 2,097 | -0.19% | 43 | 48 | Township |
| Pilot | 15 | 1,955 | 1,985 | 0.05% | 40 | 49 | Township |
| St. Anne | 16 | 1,955 | 1,996 | -0.1% | 65 | 30 | Township |
| Bradley | 17 | 1,903 | 1,899 | 0.63% | 42 | 45 | Township |
| Pembroke | 18 | 1,874 | 1,840 | 1.41% | 36 | 52 | Township |
| Limestone | 19 | 1,518 | 1,546 | -0.39% | 566 | 3 | Village |
| Essex | 20 | 1,499 | 1,486 | 0.13% | 42 | 36 | Township |
| Herscher | 21 | 1,487 | 1,517 | -0.4% | 820 | 2 | Village |
| Grant Park | 22 | 1,280 | 1,289 | -0.16% | 375 | 3 | Village |
| Salina | 23 | 1,217 | 1,238 | -0.08% | 33 | 37 | Township |
| St. Anne | 24 | 1,123 | 1,156 | -0.62% | 1,353 | 1 | Village |
| Norton | 25 | 919 | 937 | -0.11% | 18 | 50 | Township |
| Essex | 26 | 856 | 839 | 0.35% | 368 | 2 | Village |
| Rockville | 27 | 773 | 785 | 0% | 21 | 36 | Township |
| Aroma Park | 28 | 650 | 663 | -0.46% | 345 | 2 | Village |
| Hopkins Park | 29 | 630 | 605 | 0.8% | 151 | 4 | Village |
| Essex | 30 | 573 | 581 | 0.17% | 16 | 36 | Township |
| Bonfield | 31 | 340 | 350 | -0.58% | 691 | 0 | Village |
| Buckingham | 32 | 237 | 241 | -0.42% | 944 | 0 | Village |
| Sammons Point | 33 | 214 | 218 | -0.47% | 116 | 2 | Village |
| Reddick | 34 | 194 | 198 | -0.51% | 812 | 0 | Village |
| Eagle Lake | 35 | 145 | 61 | 7.41% | 241 | 1 | CDP |
| Irwin | 36 | 66 | 68 | -1.49% | 1,467 | 0 | Village |
| Andres | 37 | 51 | 36 | 6.25% | 429 | 0 | CDP |
| Union Hill | 38 | 51 | 53 | -1.92% | 785 | 0 | Village |
| Goodenow | 39 | 11 | 81 | 10% | 344 | 0 | CDP |
Bourbonnais is the largest city in Kankakee County, with a population of 39,086.
Goodenow is the smallest city in Kankakee County, with a population of 11.
There are 39 cities in Kankakee County, Illinois.