Henry County, Illinois
Henry County, Illinois, has 48,095 residents (July 2025 estimate). Its county seat is Cambridge. It uses Central Time and covers 823 sq mi (2,132 km²) of land.
- Resident population, July 2025
- 48,095
- Land area
- 823 sq mi (2,132 km²)
- County seat or government
- Cambridge
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $71,911 ± $2,277
- Median home value
- $151,600 ± $6,905
- Median rent, with utilities
- $842 ± $44
- Homes lived in by their owners
- 79.9% ± 1.4 points
- County type
- County
- Metro or micro area
- Davenport-Moline-Rock Island, IA-IL metro areaOutlying county
- Water area
- 2.5 sq mi (6.48 km²)
- State
- Illinois
- County code (FIPS)
- 17073
- Coordinates (central point)
- 41.350021, -90.130838
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Henry County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Central TimeAmerica/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 6144313,456 people
- 6125412,135 people
- 612416,587 people
- 612405,795 people
- 612733,120 people
- 612773,054 people
- 614342,971 people
- 612502,781 people
- 612382,549 people
- 613611,417 people
- 612351,283 people
- 612831,269 people
All 24
24 ZIP Code areas overlap Henry County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Townships in Henry County, largest first
- Kewanee Township9,622 people
- Geneseo Township7,520 people
- Colona Township6,633 people
- Wethersfield Township3,746 people
- Western Township2,887 people
- Hanna Township2,872 people
- Galva Township2,669 people
- Cambridge Township2,255 people
- Phenix Township1,780 people
- Oxford Township1,213 people
- Annawan Township1,084 people
- Atkinson Township1,070 people
All 24
- Lynn Township917 people
- Clover Township818 people
- Andover Township606 people
- Edford Township563 people
- Yorktown Township503 people
- Osco Township386 people
- Munson Township339 people
- Weller Township290 people
- Loraine Township280 people
- Cornwall Township239 people
- Burns Township230 people
- Alba Township121 people
People counts are American Community Survey 2020–2024 5-year estimates. All townships in Illinois, by county
School districts in Henry County, largest first
- United Township High School District 3039,552 people
- Geneseo Community Unit School District 22816,210 people
- Kewanee Community Unit School District 22910,484 people
- Orion Community Unit School District 2235,794 people
- Prophetstown-Lyndon-Tampico Community Unit School District 34,500 people
- Stark County Community Unit School District 1004,249 people
- Colona School District 1903,869 people
- Wethersfield Community Unit School District 2303,593 people
- Erie Community Unit School District 13,549 people
- ROWVA Community Unit School District 2083,480 people
- Galva Community Unit School District 2243,194 people
- Cambridge Community Unit School District 2272,520 people
All 14
- Alwood Community Unit School District 2252,260 people
- Annawan Community Unit School District 2261,982 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Kewanee, Illinois (city)11,913 people
- Geneseo, Illinois (city)6,673 people
- Colona, Illinois (city)5,139 people
- Coal Valley, Illinois (village)4,229 people
- Galva, Illinois (city)2,454 people
- Cambridge, Illinois (village)2,128 people
- Orion, Illinois (village)1,812 people
- Atkinson, Illinois (town)982 people
- Annawan, Illinois (town)865 people
- Alpha, Illinois (village)831 people
- Woodhull, Illinois (village)731 people
- Andover, Illinois (village)434 people
All 19
- Cleveland, Illinois (village)208 people
- Hooppole, Illinois (village)182 people
- Bishop Hill, Illinois (village)134 people
- Ophiem, Illinois (CDP)92 people
- Osco, Illinois (CDP)74 people
- Nekoma, Illinois (CDP)49 people
- Lynn Center, Illinois (CDP)36 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Rock Island County, Illinois24 mi west
- Stark County, Illinois25 mi southeast
- Knox County, Illinois29 mi south
- Whiteside County, Illinois30 mi north
- Bureau County, Illinois31 mi east
- Mercer County, Illinois33 mi west
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county where you are now, check its ZIP area, or check the time zone where you are.
Areas that only touch the edge
These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.