56 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Champaign | 1 | 89,736 | 88,368 | 0.31% | 3,897 | 23 | City |
| Champaign City | 2 | 89,403 | 88,368 | 0.12% | 3,883 | 23 | Township |
| Homer | 3 | 41,563 | 40,746 | 0.73% | 1,154 | 36 | Township |
| Urbana | 4 | 38,196 | 38,228 | -0.02% | 3,226 | 12 | City |
| Cunningham | 5 | 37,799 | 38,228 | -0.54% | 3,192 | 12 | Township |
| Mahomet | 6 | 14,802 | 13,764 | 1.29% | 449 | 33 | Township |
| Rantoul | 7 | 11,710 | 12,325 | -1.04% | 1,379 | 8 | Village |
| Champaign | 8 | 11,079 | 11,298 | -0.54% | 618 | 18 | Township |
| Mahomet | 9 | 10,775 | 9,520 | 2.39% | 1,108 | 10 | Village |
| Rantoul | 10 | 9,995 | 10,561 | -1.23% | 202 | 50 | Township |
| Savoy | 11 | 8,908 | 8,865 | 0.1% | 2,711 | 3 | Village |
| Urbana | 12 | 7,277 | 7,534 | -0.79% | 306 | 24 | Township |
| Tolono | 13 | 6,073 | 6,281 | -0.83% | 170 | 36 | Township |
| St. Joseph | 14 | 5,299 | 5,577 | -1.12% | 145 | 36 | Township |
| Ludlow | 15 | 3,968 | 4,182 | -1.17% | 108 | 37 | Township |
| St. Joseph | 16 | 3,598 | 3,795 | -1.07% | 1,727 | 2 | Village |
| Tolono | 17 | 3,412 | 3,586 | -1.02% | 1,656 | 2 | Village |
| Lake Woods | 18 | 2,209 | 2,515 | -2.08% | 1,313 | 2 | CDP |
| Brown | 19 | 1,992 | 2,096 | -1.19% | 55 | 36 | Township |
| Fisher | 20 | 1,964 | 2,056 | -0.91% | 1,477 | 1 | Village |
| Philo | 21 | 1,789 | 1,891 | -1.21% | 49 | 37 | Township |
| Sidney | 22 | 1,604 | 1,698 | -1.29% | 44 | 36 | Township |
| Ogden | 23 | 1,468 | 1,540 | -1.08% | 39 | 38 | Township |
| South Homer | 24 | 1,401 | 1,482 | -1.27% | 50 | 28 | Township |
| Philo | 25 | 1,315 | 1,389 | -1.13% | 1,586 | 1 | Village |
| Newcomb | 26 | 1,301 | 1,363 | -1.14% | 36 | 36 | Township |
| Compromise | 27 | 1,245 | 1,312 | -1.11% | 26 | 48 | Township |
| Sidney | 28 | 1,138 | 1,202 | -1.13% | 1,824 | 1 | Village |
| Homer | 29 | 1,011 | 1,071 | -1.17% | 1,032 | 1 | Village |
| Hensley | 30 | 978 | 1,026 | -1.11% | 32 | 30 | Township |
| Thomasboro | 31 | 976 | 1,030 | -1.11% | 976 | 1 | Village |
| Scott | 32 | 948 | 995 | -1.15% | 26 | 36 | Township |
| Sadorus | 33 | 883 | 921 | -0.79% | 23 | 38 | Township |
| Somer | 34 | 873 | 906 | -0.91% | 27 | 33 | Township |
| Gifford | 35 | 867 | 907 | -0.91% | 1,953 | 0 | Village |
| Pesotum | 36 | 841 | 879 | -1.06% | 24 | 35 | Township |
| Ogden | 37 | 702 | 732 | -0.85% | 1,194 | 1 | Village |
| Harwood | 38 | 615 | 629 | -0.49% | 17 | 37 | Township |
| East Bend | 39 | 609 | 639 | -1.14% | 17 | 36 | Township |
| Pesotum | 40 | 531 | 550 | -0.75% | 933 | 1 | Village |
| Stanton | 41 | 477 | 501 | -1.04% | 14 | 35 | Township |
| Condit | 42 | 456 | 479 | -1.08% | 13 | 36 | Township |
| Ayers | 43 | 402 | 427 | -1.23% | 18 | 23 | Township |
| Sadorus | 44 | 385 | 399 | -0.77% | 375 | 1 | Village |
| Bondville | 45 | 369 | 386 | -0.81% | 1,470 | 0 | Village |
| Crittenden | 46 | 317 | 335 | -1.25% | 9 | 36 | Township |
| Broadlands | 47 | 295 | 314 | -1.34% | 916 | 0 | Village |
| Ludlow | 48 | 291 | 306 | -1.02% | 733 | 0 | Village |
| Seymour | 49 | 278 | 145 | -0.71% | 2,989 | 0 | CDP |
| Royal | 50 | 274 | 291 | -1.08% | 1,497 | 0 | Village |
| Ivesdale | 51 | 248 | 263 | -1.2% | 346 | 1 | Village |
| Penfield | 52 | 199 | 235 | 0% | 774 | 0 | CDP |
| Dewey | 53 | 159 | 90 | 7.43% | 1,639 | 0 | CDP |
| Kerr | 54 | 145 | 153 | -1.36% | 7 | 22 | Township |
| Longview | 55 | 108 | 115 | -0.92% | 437 | 0 | Village |
| Foosland | 56 | 71 | 75 | -1.39% | 1,029 | 0 | Village |
Champaign is the largest city in Champaign County, with a population of 89,736.
Foosland is the smallest city in Champaign County, with a population of 71.
There are 56 cities in Champaign County, Illinois.