Brown County, Illinois
County seat: Mount Sterling · Population 6,401 (2025) · 306 sq mi
Brown County is the 91st most populous of Illinois's 102 counties, with 6,401 people (2025 estimate). Its county seat is Mount Sterling. It is part of the West Central region, one of the 10 Illinois economic development regions (DCEO). The map shows its 4 cities and towns and the 5 neighboring counties.
Brown County facts
- County seat
- Mount Sterling
- Population (2025 estimate)
- 6,401 +2.5% since 2020
- Land area
- 306 sq mi 91st largest of 102
- Water area
- 2 sq mi
- Population density
- 21 per sq mi
- Established
- 1839
- Same name
- One of 9 Brown Counties in the US
- Named after
- Jacob Brown American general in the War of 1812
- Largest city
- Mount Sterling 2,155
- Median household income
- $67,917
- Cities and towns
- 4
- ZIP codes
- 5
- Time zone
- Central
- FIPS code
- 17009
Cities and towns in Brown County
Brown County has 4 incorporated cities, towns and villages. Populations count the people living inside Brown County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Mount Sterling (county seat) | City | 2,155 | |
| Versailles | Village | 446 | |
| Mound Station | Village | 117 | |
| Ripley | Village | 51 |
ZIP codes in Brown County
5 ZIP codes reach into Brown County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 62323 also Pike County
- 62324 also Adams County
- 62353 also Pike and Schuyler counties
- 62375
- 62378
Population of Brown County, 2020–2025
Brown County grew by 156 people (+2.5%) between April 2020 and July 2025: 33 more deaths than births and a net gain of 208 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 6,232 |
| 2021 | 6,437 |
| 2022 | 6,429 |
| 2023 | 6,484 |
| 2024 | 6,438 |
| 2025 | 6,401 |
Neighboring counties
- Schuyler County northeast · 6,657 people
- Pike County south · 14,231 people
- Adams County west · 64,267 people
- Cass County east · 12,463 people
- Morgan County southeast · 32,515 people
Printable Brown County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (76 KB)
- PNG (2400 px) (65 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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