| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Mount Sterling | 1 | 2,200 | 1,998 | 2.09% | 1,986 | 1 | City |
| Versailles | 2 | 447 | 444 | 0.22% | 479 | 1 | Village |
| Mound Station | 3 | 117 | 116 | 0% | 225 | 1 | Village |
| Ripley | 4 | 51 | 49 | 0% | 135 | 0 | Village |
Mount Sterling is the largest city in Brown County, with a population of 2,200.
Ripley is the smallest city in Brown County, with a population of 51.
There are 4 cities in Brown County, Illinois.