Hamilton County, Illinois
County seat: McLeansboro · Population 7,859 (2025) · 435 sq mi
Hamilton County is the 89th most populous of Illinois's 102 counties, with 7,859 people (2025 estimate). Its county seat is McLeansboro. It is part of the Southern region, one of the 10 Illinois economic development regions (DCEO). The map shows its 5 cities and towns and the 6 neighboring counties.
Hamilton County facts
- County seat
- McLeansboro
- Population (2025 estimate)
- 7,859 −1.7% since 2020
- Land area
- 435 sq mi 66th largest of 102
- Water area
- 1 sq mi
- Population density
- 18 per sq mi
- Established
- 1821
- Same name
- One of 10 Hamilton Counties in the US
- Named after
- Alexander Hamilton American Founding Father and statesman (1755/1757–1804)
- Largest city
- McLeansboro 2,585
- Median household income
- $65,746
- Cities and towns
- 5
- ZIP codes
- 13
- Time zone
- Central
- FIPS code
- 17065
Cities and towns in Hamilton County
Hamilton County has 5 incorporated cities, towns and villages. Populations count the people living inside Hamilton County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| McLeansboro (county seat) | City | 2,585 | |
| Dahlgren | Village | 495 | |
| Broughton | Village | 180 | |
| Belle Prairie City | Town | 47 | |
| Macedonia | Village | 15 | Franklin County |
ZIP codes in Hamilton County
13 ZIP codes reach into Hamilton County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 62810 also Jefferson and Wayne counties
- 62817
- 62828 also Wayne County
- 62829
- 62835 also White County
- 62859 also Franklin County
- 62860 also Franklin County
- 62869 also White, Saline and Gallatin counties
- 62887 also White County
- 62890 also Franklin, Williamson and Saline counties
- 62895 also Wayne County
- 62930 also Saline and Gallatin counties
- 62935 also Saline and Williamson counties
Population of Hamilton County, 2020–2025
Hamilton County shrank by 133 people (−1.7%) between April 2020 and July 2025: 150 more deaths than births and a net gain of 18 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 7,996 |
| 2021 | 7,914 |
| 2022 | 7,981 |
| 2023 | 7,895 |
| 2024 | 7,861 |
| 2025 | 7,859 |
Neighboring counties
- White County east · 13,250 people
- Saline County south · 22,772 people
- Wayne County north · 15,882 people
- Franklin County west · 36,916 people
- Jefferson County northwest · 36,147 people
- Gallatin County southeast · 4,616 people
Printable Hamilton 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) (81 KB)
- PNG (2400 px) (63 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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