10 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lincoln | 1 | 12,948 | 13,245 | -0.38% | 2,073 | 6 | City |
| Atlanta | 2 | 1,620 | 1,662 | -0.43% | 1,297 | 1 | City |
| Mount Pulaski | 3 | 1,493 | 1,531 | -0.4% | 1,317 | 1 | City |
| Emden | 4 | 449 | 464 | -0.44% | 1,911 | 0 | Village |
| Elkhart | 5 | 435 | 449 | -0.46% | 232 | 2 | Village |
| Middletown | 6 | 321 | 327 | -0.31% | 941 | 0 | Village |
| Latham | 7 | 319 | 330 | -0.62% | 1,168 | 0 | Village |
| New Holland | 8 | 264 | 272 | -0.38% | 852 | 0 | Village |
| Hartsburg | 9 | 252 | 260 | -0.4% | 1,680 | 0 | Village |
| Broadwell | 10 | 138 | 141 | 0% | 767 | 0 | Village |
Lincoln is the largest city in Logan County, with a population of 12,948.
Broadwell is the smallest city in Logan County, with a population of 138.
There are 10 cities in Logan County, Illinois.