Calhoun County, Illinois
County seat: Hardin · Population 4,300 (2025) · 254 sq mi
Calhoun County is the 100th most populous of Illinois's 102 counties, with 4,300 people (2025 estimate). Its county seat is Hardin. It is part of the Southwest region, one of the 10 Illinois economic development regions (DCEO). The map shows its 5 cities and towns and the 6 neighboring counties.
Calhoun County facts
- County seat
- Hardin
- Population (2025 estimate)
- 4,300 −2.9% since 2020
- Land area
- 254 sq mi 94th largest of 102
- Water area
- 30 sq mi
- Population density
- 17 per sq mi
- Established
- 1825
- Same name
- One of 11 Calhoun Counties in the US
- Named after
- John C. Calhoun vice president of the United States from 1825 to 1832 (1782–1850)
- Largest city
- Hardin 779
- Median household income
- $93,203
- Cities and towns
- 5
- ZIP codes
- 7
- Time zone
- Central
- FIPS code
- 17013
Cities and towns in Calhoun County
Calhoun County has 5 incorporated cities, towns and villages. Populations count the people living inside Calhoun County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Hardin (county seat) | Village | 779 | |
| Kampsville | Village | 294 | |
| Batchtown | Village | 166 | |
| Brussels | Village | 111 | |
| Hamburg | Village | 95 |
ZIP codes in Calhoun County
7 ZIP codes reach into Calhoun County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 62006
- 62013
- 62036
- 62045
- 62047
- 62053
- 62355 also Pike County
Population of Calhoun County, 2020–2025
Calhoun County shrank by 130 people (−2.9%) between April 2020 and July 2025: 90 more deaths than births and a net loss of 39 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 4,399 |
| 2021 | 4,389 |
| 2022 | 4,330 |
| 2023 | 4,329 |
| 2024 | 4,310 |
| 2025 | 4,300 |
Neighboring counties
- Lincoln County, Missouri southwest · 66,676 people
- Greene County northeast · 11,313 people
- Pike County, Missouri northwest · 17,955 people
- Pike County north · 14,231 people
- St. Charles County, Missouri south · 426,499 people
- Jersey County east · 21,160 people
Printable Calhoun 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) (95 KB)
- PNG (2400 px) (100 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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