Henderson County, Illinois
County seat: Oquawka · Population 5,984 (2025) · 379 sq mi
Henderson County is the 92nd most populous of Illinois's 102 counties, with 5,984 people (2025 estimate). Its county seat is Oquawka. It is part of the West Central region, one of the 10 Illinois economic development regions (DCEO). The map shows its 9 cities and towns and the 6 neighboring counties.
Henderson County facts
- County seat
- Oquawka
- Population (2025 estimate)
- 5,984 −6.4% since 2020
- Land area
- 379 sq mi 78th largest of 102
- Water area
- 16 sq mi
- Population density
- 16 per sq mi
- Established
- 1841
- Same name
- One of 5 Henderson Counties in the US
- Named after
- Richard Henderson American jurist (1734-1785)
- Largest city
- Oquawka 1,065
- Median household income
- $62,227
- Cities and towns
- 9 plus 1 CDPs
- ZIP codes
- 17
- Time zone
- Central
- FIPS code
- 17071
Cities and towns in Henderson County
Henderson County has 9 incorporated cities, towns and villages. Populations count the people living inside Henderson County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Oquawka (county seat) | Village | 1,065 | |
| Stronghurst | Village | 760 | |
| Lomax | Village | 376 | |
| Biggsville | Village | 282 | |
| Gladstone | Village | 218 | |
| Dallas City | City | 154 | Hancock County |
| Media | Village | 110 | |
| Raritan | Village | 98 | |
| Gulfport | Village | 39 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Carman | 250 |
ZIP codes in Henderson County
17 ZIP codes reach into Henderson County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 61418
- 61425
- 61437
- 61442 also Mercer County
- 61447 also Warren County
- 61450 also Hancock and McDonough counties
- 61453 also Warren County
- 61454
- 61460
- 61462 also Warren County
- 61469
- 61471
- 61475 also McDonough and Warren counties
- 61476 also Mercer County
- 61478 also Warren County
- 61480
- 62330 also Hancock County
Population of Henderson County, 2020–2025
Henderson County shrank by 408 people (−6.4%) between April 2020 and July 2025: 198 more deaths than births and a net loss of 214 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 6,340 |
| 2021 | 6,317 |
| 2022 | 6,171 |
| 2023 | 6,106 |
| 2024 | 6,031 |
| 2025 | 5,984 |
Neighboring counties
- Warren County east · 16,222 people
- Des Moines County, Iowa northwest · 38,077 people
- Hancock County southwest · 16,803 people
- Mercer County north · 15,229 people
- McDonough County southeast · 25,916 people
- Lee County, Iowa west · 32,306 people
Printable Henderson 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) (97 KB)
- PNG (2400 px) (87 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.
Back to the Illinois county map with all 102 counties. Found an error? Tell us.