| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Tuscola | 1 | 4,671 | 4,641 | 0.06% | 1,584 | 3 | City |
| Arcola | 2 | 2,924 | 2,933 | -0.14% | 1,445 | 2 | City |
| Villa Grove | 3 | 2,440 | 2,477 | -0.29% | 1,625 | 2 | City |
| Arthur | 4 | 2,272 | 2,220 | 0.49% | 1,699 | 1 | Village |
| Atwood | 5 | 1,096 | 1,110 | -0.36% | 1,785 | 1 | Village |
| Newman | 6 | 768 | 777 | -0.26% | 1,253 | 1 | City |
| Camargo | 7 | 459 | 455 | 0% | 365 | 1 | Village |
| Hindsboro | 8 | 272 | 277 | -0.37% | 1,011 | 0 | Village |
| Garrett | 9 | 126 | 125 | 0% | 1,167 | 0 | Village |
Tuscola is the largest city in Douglas County, with a population of 4,671.
Garrett is the smallest city in Douglas County, with a population of 126.
There are 9 cities in Douglas County, Illinois.