56 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Champaign City | 1 | 93,192 | 88,396 | 1.34% | 4,047 | 23 | Township |
| Champaign | 2 | 92,852 | 88,396 | 0.97% | 4,032 | 23 | City |
| Homer | 3 | 41,865 | 40,748 | 0.91% | 1,163 | 36 | Township |
| Cunningham | 4 | 40,207 | 38,867 | 0.94% | 3,396 | 12 | Township |
| Urbana | 5 | 40,072 | 38,867 | 0.61% | 3,384 | 12 | City |
| Mahomet | 6 | 15,110 | 13,731 | 1.53% | 459 | 33 | Township |
| Rantoul | 7 | 12,253 | 12,325 | -0.12% | 1,443 | 8 | Village |
| Champaign | 8 | 11,777 | 11,288 | 1.66% | 657 | 18 | Township |
| Mahomet | 9 | 10,901 | 9,491 | 2.66% | 1,121 | 10 | Village |
| Rantoul | 10 | 10,590 | 10,561 | 0.74% | 214 | 50 | Township |
| Savoy | 11 | 9,358 | 8,865 | 1.06% | 2,848 | 3 | Village |
| Urbana | 12 | 7,662 | 7,524 | 0.96% | 322 | 24 | Township |
| Tolono | 13 | 6,475 | 6,282 | 1.41% | 182 | 36 | Township |
| St. Joseph | 14 | 5,605 | 5,576 | 0.77% | 154 | 36 | Township |
| Ludlow | 15 | 4,200 | 4,180 | 0.77% | 115 | 37 | Township |
| St. Joseph | 16 | 3,766 | 3,794 | -0.16% | 1,808 | 2 | Village |
| Tolono | 17 | 3,580 | 3,583 | -0.03% | 1,737 | 2 | Village |
| Lake Woods | 18 | 2,209 | 2,515 | -2.08% | 1,313 | 2 | CDP |
| Brown | 19 | 2,181 | 2,095 | 2.44% | 60 | 36 | Township |
| Fisher | 20 | 2,102 | 2,051 | 0.48% | 1,580 | 1 | Village |
| Philo | 21 | 1,904 | 1,891 | 0.95% | 52 | 37 | Township |
| Sidney | 22 | 1,702 | 1,699 | 0.71% | 47 | 36 | Township |
| Ogden | 23 | 1,551 | 1,539 | 0.85% | 41 | 38 | Township |
| South Homer | 24 | 1,509 | 1,482 | 1.48% | 54 | 28 | Township |
| Newcomb | 25 | 1,385 | 1,364 | 1.02% | 38 | 36 | Township |
| Philo | 26 | 1,384 | 1,389 | -0.07% | 1,669 | 1 | Village |
| Compromise | 27 | 1,324 | 1,312 | 0.99% | 28 | 48 | Township |
| Sidney | 28 | 1,192 | 1,202 | -0.17% | 1,910 | 1 | Village |
| Homer | 29 | 1,076 | 1,073 | 0% | 1,098 | 1 | Village |
| Hensley | 30 | 1,035 | 1,026 | 0.78% | 34 | 30 | Township |
| Thomasboro | 31 | 1,021 | 1,030 | -0.2% | 1,021 | 1 | Village |
| Scott | 32 | 1,002 | 992 | 0.91% | 28 | 36 | Township |
| Sadorus | 33 | 933 | 924 | 0.97% | 25 | 38 | Township |
| Somer | 34 | 925 | 907 | 0.98% | 28 | 33 | Township |
| Gifford | 35 | 906 | 906 | 0% | 2,041 | 0 | Village |
| Pesotum | 36 | 888 | 878 | 0.79% | 25 | 35 | Township |
| Ogden | 37 | 729 | 731 | -0.14% | 1,240 | 1 | Village |
| Harwood | 38 | 641 | 628 | 1.1% | 17 | 37 | Township |
| East Bend | 39 | 639 | 633 | 0.79% | 18 | 36 | Township |
| Pesotum | 40 | 554 | 549 | 0.18% | 974 | 1 | Village |
| Stanton | 41 | 507 | 501 | 0.8% | 15 | 35 | Township |
| Condit | 42 | 480 | 472 | 1.27% | 13 | 36 | Township |
| Ayers | 43 | 425 | 428 | 0.24% | 19 | 23 | Township |
| Sadorus | 44 | 400 | 398 | 0% | 389 | 1 | Village |
| Bondville | 45 | 381 | 385 | -0.26% | 1,518 | 0 | Village |
| Crittenden | 46 | 335 | 334 | 0.6% | 9 | 36 | Township |
| Broadlands | 47 | 311 | 315 | -0.32% | 966 | 0 | Village |
| Ludlow | 48 | 300 | 304 | -0.33% | 756 | 0 | Village |
| Royal | 49 | 287 | 290 | -0.35% | 1,568 | 0 | Village |
| Seymour | 50 | 278 | 145 | -0.71% | 2,989 | 0 | CDP |
| Ivesdale | 51 | 261 | 264 | -0.38% | 365 | 1 | Village |
| Penfield | 52 | 199 | 235 | 0% | 774 | 0 | CDP |
| Dewey | 53 | 159 | 90 | 7.43% | 1,639 | 0 | CDP |
| Kerr | 54 | 154 | 153 | 0.65% | 7 | 22 | Township |
| Longview | 55 | 111 | 113 | -0.89% | 449 | 0 | Village |
| Foosland | 56 | 75 | 75 | 0% | 1,087 | 0 | Village |
Champaign City is the largest city in Champaign County, with a population of 93,192.
Foosland is the smallest city in Champaign County, with a population of 75.
There are 56 cities in Champaign County, Illinois.