Henry County, Illinois
County seat: Cambridge · Population 48,095 (2025) · 823 sq mi
Henry County is the 29th most populous of Illinois's 102 counties, with 48,095 people (2025 estimate). Its county seat is Cambridge. It is part of the Northwest region, one of the 10 Illinois economic development regions (DCEO). The map shows its 15 cities and towns and the 6 neighboring counties.
Henry County facts
- County seat
- Cambridge
- Population (2025 estimate)
- 48,095 −2.4% since 2020
- Land area
- 823 sq mi 15th largest of 102
- Water area
- 3 sq mi
- Population density
- 58 per sq mi
- Established
- 1825
- Same name
- One of 10 Henry Counties in the US
- Named after
- Patrick Henry American Founding Father, orator and politician (1736 – 1799)
- Largest city
- Kewanee 12,115
- Median household income
- $71,911
- Cities and towns
- 15 plus 4 CDPs
- ZIP codes
- 24
- Time zone
- Central
- FIPS code
- 17073
Cities and towns in Henry County
Henry County has 15 incorporated cities, towns and villages. Populations count the people living inside Henry County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Kewanee | City | 12,115 | |
| Geneseo | City | 6,505 | |
| Colona | City | 4,938 | |
| Galva | City | 2,383 | |
| Cambridge (county seat) | Village | 2,020 | |
| Orion | Village | 1,708 | |
| Atkinson | Town | 924 | |
| Annawan | Town | 858 | Bureau County |
| Woodhull | Village | 731 | |
| Alpha | Village | 653 | |
| Andover | Village | 536 | |
| Hooppole | Village | 173 | |
| Coal Valley | Village | 168 | Rock Island County |
| Cleveland | Village | 159 | |
| Bishop Hill | Village | 112 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Ophiem | 92 | |
| Osco | 74 | |
| Nekoma | 49 | |
| Lynn Center | 36 |
ZIP codes in Henry County
24 ZIP codes reach into Henry County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 61233
- 61234
- 61235
- 61238
- 61240 also Rock Island County
- 61241
- 61250 also Whiteside County
- 61254 also Whiteside County
- 61258
- 61262 also Mercer County
- 61273 also Rock Island and Mercer counties
- 61274
- 61277 also Whiteside County
- 61283 also Whiteside and Bureau counties
- 61344 also Bureau County
- 61361 also Bureau County
- 61413
- 61414 also Knox County
- 61419
- 61434 also Knox and Stark counties
- 61443 also Stark and Bureau counties
- 61465 also Mercer County
- 61468
- 61490 also Knox County
Population of Henry County, 2020–2025
Henry County shrank by 1,189 people (−2.4%) between April 2020 and July 2025: 675 more deaths than births and a net loss of 507 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 49,174 |
| 2021 | 48,940 |
| 2022 | 48,583 |
| 2023 | 48,353 |
| 2024 | 48,193 |
| 2025 | 48,095 |
Neighboring counties
- Rock Island County west · 141,869 people
- Bureau County east · 32,510 people
- Knox County south · 47,767 people
- Whiteside County north · 54,121 people
- Stark County southeast · 5,319 people
- Mercer County west · 15,229 people
Printable Henry 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) (103 KB)
- PNG (2400 px) (79 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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