52 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Champaign City | 1 | 94,423 | 88,396 | 1.32% | 4,101 | 23 | Township |
| Champaign | 2 | 93,743 | 88,396 | 0.96% | 4,071 | 23 | City |
| Homer | 3 | 42,244 | 40,748 | 0.91% | 1,173 | 36 | Township |
| Cunningham | 4 | 40,583 | 38,867 | 0.94% | 3,427 | 12 | Township |
| Urbana | 5 | 40,313 | 38,867 | 0.6% | 3,405 | 12 | City |
| Mahomet | 6 | 15,337 | 13,731 | 1.5% | 465 | 33 | Township |
| Rantoul | 7 | 12,239 | 12,325 | -0.11% | 1,442 | 8 | Village |
| Champaign | 8 | 11,969 | 11,288 | 1.63% | 667 | 18 | Township |
| Mahomet | 9 | 11,183 | 9,491 | 2.59% | 1,150 | 10 | Village |
| Rantoul | 10 | 10,668 | 10,561 | 0.74% | 215 | 50 | Township |
| Savoy | 11 | 9,457 | 8,865 | 1.06% | 2,878 | 3 | Village |
| Urbana | 12 | 7,735 | 7,524 | 0.95% | 325 | 24 | Township |
| Tolono | 13 | 6,565 | 6,282 | 1.39% | 184 | 36 | Township |
| St. Joseph | 14 | 5,648 | 5,576 | 0.77% | 155 | 36 | Township |
| Ludlow | 15 | 4,232 | 4,180 | 0.76% | 116 | 37 | Township |
| St. Joseph | 16 | 3,761 | 3,794 | -0.13% | 1,806 | 2 | Village |
| Tolono | 17 | 3,580 | 3,583 | 0% | 1,737 | 2 | Village |
| Brown | 18 | 2,233 | 2,095 | 2.38% | 62 | 36 | Township |
| Fisher | 19 | 2,112 | 2,051 | 0.48% | 1,588 | 1 | Village |
| Philo | 20 | 1,922 | 1,891 | 0.95% | 52 | 37 | Township |
| Sidney | 21 | 1,714 | 1,699 | 0.71% | 47 | 36 | Township |
| Ogden | 22 | 1,564 | 1,539 | 0.84% | 42 | 38 | Township |
| South Homer | 23 | 1,531 | 1,482 | 1.46% | 55 | 28 | Township |
| Newcomb | 24 | 1,399 | 1,364 | 1.01% | 39 | 36 | Township |
| Philo | 25 | 1,383 | 1,389 | -0.07% | 1,668 | 1 | Village |
| Compromise | 26 | 1,337 | 1,312 | 0.98% | 28 | 48 | Township |
| Sidney | 27 | 1,190 | 1,202 | -0.17% | 1,907 | 1 | Village |
| Homer | 28 | 1,077 | 1,073 | 0.09% | 1,099 | 1 | Village |
| Hensley | 29 | 1,043 | 1,026 | 0.77% | 35 | 30 | Township |
| Thomasboro | 30 | 1,019 | 1,030 | -0.2% | 1,019 | 1 | Village |
| Scott | 31 | 1,011 | 992 | 0.9% | 28 | 36 | Township |
| Sadorus | 32 | 942 | 924 | 0.96% | 25 | 38 | Township |
| Somer | 33 | 934 | 907 | 0.97% | 29 | 33 | Township |
| Gifford | 34 | 906 | 906 | 0% | 2,041 | 0 | Village |
| Pesotum | 35 | 895 | 878 | 0.79% | 26 | 35 | Township |
| Ogden | 36 | 729 | 731 | 0% | 1,240 | 1 | Village |
| Harwood | 37 | 648 | 628 | 1.09% | 18 | 37 | Township |
| East Bend | 38 | 644 | 633 | 0.78% | 18 | 36 | Township |
| Pesotum | 39 | 555 | 549 | 0.18% | 975 | 1 | Village |
| Stanton | 40 | 511 | 501 | 0.79% | 15 | 35 | Township |
| Condit | 41 | 486 | 472 | 1.25% | 13 | 36 | Township |
| Ayers | 42 | 426 | 428 | 0.24% | 19 | 23 | Township |
| Sadorus | 43 | 401 | 398 | 0.25% | 390 | 1 | Village |
| Bondville | 44 | 380 | 385 | -0.26% | 1,514 | 0 | Village |
| Crittenden | 45 | 337 | 334 | 0.6% | 9 | 36 | Township |
| Broadlands | 46 | 310 | 315 | -0.32% | 963 | 0 | Village |
| Ludlow | 47 | 299 | 304 | -0.33% | 753 | 0 | Village |
| Royal | 48 | 287 | 290 | 0% | 1,568 | 0 | Village |
| Ivesdale | 49 | 261 | 264 | 0% | 365 | 1 | Village |
| Kerr | 50 | 155 | 153 | 0.65% | 7 | 22 | Township |
| Longview | 51 | 111 | 113 | 0% | 449 | 0 | Village |
| Foosland | 52 | 75 | 75 | 0% | 1,087 | 0 | Village |
Champaign City is the largest city in Champaign County, with a population of 94,423.
Foosland is the smallest city in Champaign County, with a population of 75.
There are 52 cities in Champaign County, Illinois.