9 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Tuscola | 1 | 4,664 | 4,646 | 0.06% | 1,582 | 3 | City |
| Arcola | 2 | 2,907 | 2,931 | -0.14% | 1,437 | 2 | City |
| Villa Grove | 3 | 2,434 | 2,482 | -0.33% | 1,621 | 2 | City |
| Arthur | 4 | 2,289 | 2,229 | 0.44% | 1,712 | 1 | Village |
| Atwood | 5 | 1,087 | 1,116 | -0.46% | 1,770 | 1 | Village |
| Newman | 6 | 770 | 779 | -0.13% | 1,256 | 1 | City |
| Camargo | 7 | 452 | 452 | 0% | 359 | 1 | Village |
| Hindsboro | 8 | 271 | 277 | -0.37% | 1,007 | 0 | Village |
| Garrett | 9 | 129 | 128 | 0% | 1,194 | 0 | Village |
Tuscola is the largest city in Douglas County, with a population of 4,664.
Garrett is the smallest city in Douglas County, with a population of 129.
There are 9 cities in Douglas County, Illinois.