23 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Clintonia township | 1 | 7,235 | 7,315 | -0.1% | 241 | 30.07 | Township |
| Clinton | 2 | 6,854 | 6,963 | -0.32% | 1,934 | 3.54 | City |
| Santa Anna township | 3 | 2,272 | 2,279 | 0.04% | 79 | 28.89 | Township |
| Farmer City | 4 | 1,805 | 1,819 | -0.17% | 754 | 2.40 | City |
| Clinton township | 5 | 1,776 | 1,807 | -0.39% | 50 | 35.20 | Township |
| Texas township | 6 | 1,248 | 1,255 | 0% | 35 | 35.65 | Township |
| Wapella township | 7 | 899 | 914 | -0.33% | 31 | 29.06 | Township |
| Tunbridge township | 8 | 737 | 726 | 0.55% | 20 | 37.42 | Township |
| McLean | 9 | 721 | 741 | -0.55% | 613 | 1.18 | Village |
| Waynesville township | 10 | 634 | 638 | 0% | 26 | 24.39 | Township |
| Wapella | 11 | 502 | 512 | -0.4% | 911 | 0.55 | Village |
| Nixon township | 12 | 487 | 489 | 0% | 18 | 27.53 | Township |
| Creek township | 13 | 483 | 484 | 0% | 14 | 35.41 | Township |
| De Witt township | 14 | 427 | 422 | 0.47% | 13 | 31.77 | Township |
| Waynesville | 15 | 378 | 382 | -0.26% | 1,185 | 0.32 | Village |
| Weldon | 16 | 368 | 370 | 0% | 1,378 | 0.27 | Village |
| Barnett township | 17 | 365 | 366 | 0% | 10 | 37.38 | Township |
| Kenney | 18 | 310 | 304 | 0.32% | 1,099 | 0.28 | Village |
| Harp township | 19 | 300 | 296 | 0.67% | 10 | 31.19 | Township |
| De Witt | 20 | 165 | 160 | 0.61% | 696 | 0.24 | Village |
| Lane | 21 | 161 | 164 | 7.33% | 1,309 | 0.12 | CDP |
| Rutledge township | 22 | 151 | 152 | 0% | 6 | 24.47 | Township |
| Wilson township | 23 | 127 | 125 | 0.79% | 5 | 24.33 | Township |
Clintonia township is the largest city in De Witt County, with a population of 7,235.
Wilson township is the smallest city in De Witt County.
There are 23 cities in De Witt County, Illinois.