23 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Champaign | 1 | 93,743 | 88,396 | 0.96% | 4,071 | 23 | City |
| Urbana | 2 | 40,313 | 38,867 | 0.6% | 3,405 | 12 | City |
| Rantoul | 3 | 12,239 | 12,325 | -0.11% | 1,442 | 8 | Village |
| Mahomet | 4 | 11,183 | 9,491 | 2.59% | 1,150 | 10 | Village |
| Savoy | 5 | 9,457 | 8,865 | 1.06% | 2,878 | 3 | Village |
| St. Joseph | 6 | 3,761 | 3,794 | -0.13% | 1,806 | 2 | Village |
| Tolono | 7 | 3,580 | 3,583 | 0% | 1,737 | 2 | Village |
| Fisher | 8 | 2,112 | 2,051 | 0.48% | 1,588 | 1 | Village |
| Philo | 9 | 1,383 | 1,389 | -0.07% | 1,668 | 1 | Village |
| Sidney | 10 | 1,190 | 1,202 | -0.17% | 1,907 | 1 | Village |
| Homer | 11 | 1,077 | 1,073 | 0.09% | 1,099 | 1 | Village |
| Thomasboro | 12 | 1,019 | 1,030 | -0.2% | 1,019 | 1 | Village |
| Gifford | 13 | 906 | 906 | 0% | 2,041 | 0 | Village |
| Ogden | 14 | 729 | 731 | 0% | 1,240 | 1 | Village |
| Pesotum | 15 | 555 | 549 | 0.18% | 975 | 1 | Village |
| Sadorus | 16 | 401 | 398 | 0.25% | 390 | 1 | Village |
| Bondville | 17 | 380 | 385 | -0.26% | 1,514 | 0 | Village |
| Broadlands | 18 | 310 | 315 | -0.32% | 963 | 0 | Village |
| Ludlow | 19 | 299 | 304 | -0.33% | 753 | 0 | Village |
| Royal | 20 | 287 | 290 | 0% | 1,568 | 0 | Village |
| Ivesdale | 21 | 261 | 264 | 0% | 365 | 1 | Village |
| Longview | 22 | 111 | 113 | 0% | 449 | 0 | Village |
| Foosland | 23 | 75 | 75 | 0% | 1,087 | 0 | Village |
Champaign is the largest city in Champaign County, with a population of 93,743.
Foosland is the smallest city in Champaign County, with a population of 75.
There are 23 cities in Champaign County, Illinois.