Population6,387 (2020 Census)
Mississippi River Towns Keep Their Own Pace
Henderson County, IllinoisOquawka serves as the county seat along the Mississippi River. The county’s small communities connect western Illinois with the Burlington region across the state line. This guide brings together a starting point for county information, public services and local connections. Begin with Oquawka, then use the resource links to plan the details of a visit or an everyday errand. Check directly with each provider for current hours, access and service availability before setting out.
Henderson County at a Glance
Population6,387 (2020 Census)
County SeatOquawka
Largest MunicipalityOquawka
Established1841
ZIP Codes12 ZIP codes wholly or partly within the county (checked October 4, 2026)
Total Area395.2 sq mi (land and water; 2020 Census geography)
Major RoutesU.S. Highway 34; Illinois Route 94; Illinois Route 96; Illinois Route 116; Illinois Route 164
Area Codes309 / 861 (common local area codes)
Meet Your County Advertisers
Local Connections for Everyday Needs
Explore Jones Septic Services for septic services.
Discover Henderson County
Henderson County
The county separated from Warren County in 1841. Its name traces through Henderson County in Kentucky, linking its early identity to migration into western Illinois. Today, Oquawka remains the county seat, while Oquawka is its largest municipality. The 2020 Census counted 6,387 residents across the county. Its towns and surrounding countryside offer different ways to understand the same place: through public buildings, transportation routes and the communities that connect them. Local records and historical collections provide a starting point for exploring how those connections changed over time.
Life in Henderson County extends beyond a single town center. Mississippi River communities are part of the local setting, alongside the routine needs of households, schools and businesses. Use county offices for the services they administer and contact municipal or township offices when a question concerns a specific address. Planning around the actual destination helps make visits, appointments and local errands more practical, especially when travel crosses town or county boundaries.
What Shapes Us
Local Heritage
Established in 1841, Henderson County has a history recorded in its communities and public institutions. Start with local collections to explore specific people, buildings and events.
Landscape and Connections
Mississippi River communities help distinguish Henderson County. Its county seat, Oquawka, provides a useful starting point for understanding how nearby communities connect across the area.
Everyday Community
County and local offices connect residents with practical services. Follow the linked providers for details specific to your destination, address and purpose in Henderson County.
Explore the towns, follow the stories, make local connections.
A Look Around
Scenes from Henderson County
Places and details that tell a local story.
Radio Monmouth, IL
Henderson County Health Department Hosting ‘Be Your Own Superhero’ Wellness Fair Saturday, Oct. 17
Read the full story at Radio Monmouth, IL.
Read the Story Oct 16, 2026 • Local news
Around Henderson County
Stories from every corner of Henderson County.
Henderson County Health Department Hosting ‘Be Your Own Superhero’ Wellness Fair Saturday, Oct. 17
Read the full story at Radio Monmouth, IL.
Oct 16, 2026 • Local news
Henderson County Volunteers Help Sunflower Showmanship Contest Shine at the Illinois State Fair
Read the full story at Radio Monmouth, IL.
Sep 8, 2026 • Local news
Henderson County 4-H and Jr. Sheep Show
Read the full story at Radio Monmouth, IL.
Jul 30, 2026 • Local news
Meet the 2026 Henderson County Fair Queens
Read the full story at Radio Monmouth, IL.
Jul 29, 2026 • Local news
Keep These Businesses in Mind
Start with a Direct Conversation
Contact Jones Septic Services directly to ask about current options, availability and the services you need.
County Resources
Find the Right Local Connection
Start with the responsible public agency or service provider. Statewide links are labeled so you can locate the office that serves your address.
Government
County & Local Resources
Supervisor of Assessments
Property assessments, exemptions and assessment office information.
Phone (309) 867-3291
Schools
County & Local Resources
Hospitals and Health
County & Local Resources
Osf Holy Family Medical Center
Regional option in Warren County
Address 1000 W HARLEM AVENUE, Monmouth
Phone (309) 734-3141
Mc Donough District Hospital
Regional option in McDonough County
Address 525 EAST GRANT STREET, Macomb
Phone (309) 833-4101
Genesis Medical Center, Aledo
Regional option in Mercer County
Address 409 NW 9TH AVENUE, Aledo
Phone (309) 582-9100
Memorial Hospital
Regional option in Hancock County
Address 1454 N COUNTY ROAD 2050 E, Carthage
Phone (217) 357-8500
St Mary Medical Center
Regional option in Knox County
Address 3333 NORTH SEMINARY, Galesburg
Phone (309) 344-3161
Public Safety
County & Local Resources
Illinois State Police
Statewide or federal resource; select the office or service for your address.
Illinois State Police contacts
Find the appropriate State Police contact; call 911 for emergencies.
FBI Internet Crime Complaint Center
Report cyber-enabled crime through the federal complaint portal; emergencies require 911.
Emergency Services
County & Local Resources
Illinois Emergency Management Agency and Office of Homeland Security
Statewide or federal resource; select the office or service for your address.
National Weather Service
Statewide or federal resource; select the office or service for your address.
State Parks
County & Local Resources
Argyle Lake State Park
Colchester — regional option in McDonough County. Check facilities and access notices.
Nauvoo State Park
Nauvoo — regional option in Hancock County. Check facilities and access notices.
Weinberg-King State Park
Augusta — regional option in Hancock County. Check facilities and access notices.
Snakeden Hollow State Fish and Wildlife Area
Victoria — regional option in Knox County. Check facilities and access notices.
Rice Lake State Fish and Wildlife Area
Canton — regional option in Fulton County. Check facilities and access notices.
Trails
County & Local Resources
Argyle Lake State Park
Colchester — regional option in McDonough County. Check trail access and permitted uses.
Horn Field Campus
Macomb — regional option in McDonough County. Check trail access and permitted uses.
Spring Lake Park
Macomb — regional option in McDonough County. Check trail access and permitted uses.
Nauvoo State Park
Nauvoo — regional option in Hancock County. Check trail access and permitted uses.
Weinberg-King State Park
Augusta — regional option in Hancock County. Check trail access and permitted uses.
Utilities
County & Local Resources
Illinois Commerce Commission
Statewide or federal resource; select the office or service for your address.
Illinois 811 — JULIE
Statewide or federal resource; select the office or service for your address.
Illinois energy assistance
Find utility-bill assistance and the local administering agency.
Libraries
County & Local Resources
Henderson County Public Library District
Address 110 Hill Crest Drive Biggsville , IL 61418-9106
Phone 309-627-2450
Warren County Public Library District
Regional library in Warren County; check borrowing eligibility
Address 62 Public Square Monmouth , IL 61462-1756
Phone 309-734-3166
Bushnell Public Library District
Regional library in McDonough County; check borrowing eligibility
Address 455 North Dean Street Bushnell , IL 61422-1228
Phone 309-772-2060
Colchester District Library
Regional library in McDonough County; check borrowing eligibility
Address 203 Macomb Street Post Office Box 237 Colchester , IL 62326-0237
Phone 309-776-4861
Macomb Public Library District
Regional library in McDonough County; check borrowing eligibility
Address 235 South Lafayette Street Macomb , IL 61455-2231
Phone 309-833-2714
Courts
County & Local Resources
Henderson County Circuit Clerk
contact the office for its service
Address 309-867-3121
Phone 309-867-3121
Henderson County Probation
contact the office for its service
Address 309-867-6811
Phone 309-867-6811
Henderson County Public Defender
contact the office for its service
Address 309-924-1211
Phone 309-924-1211
Illinois Courts
Statewide or federal resource; select the office or service for your address.
Illinois Courts — Forms
Statewide or federal resource; select the office or service for your address.
Illinois Court Help
Court-process information and help for people without an attorney.
DMV
County & Local Resources
Transportation
County & Local Resources
Illinois Department of Transportation
Statewide or federal resource; select the office or service for your address.
Getting Around Illinois
Statewide or federal resource; select the office or service for your address.
Illinois public transportation
Find public transportation information and regional agencies.
IDOT transit programs
Transit program information, including rural and intercity services.
Amtrak Illinois services
Find Illinois intercity rail routes and stations; some counties require travel to a regional station.
Postal Services
County & Local Resources
USPS Location Finder
Statewide or federal resource; select the office or service for your address.
USPS ZIP Code Lookup
Statewide or federal resource; select the office or service for your address.
USPS Informed Delivery
Statewide or federal resource; select the office or service for your address.
Veterans
County & Local Resources
Illinois Department of Veterans Affairs
Statewide or federal resource; select the office or service for your address.
VA Facility Locator
Statewide or federal resource; select the office or service for your address.
Veterans Crisis Line
Statewide or federal resource; select the office or service for your address.
Employment
County & Local Resources
IllinoisJobLink — official job-seeker help
Statewide or federal resource; select the office or service for your address.
Illinois Department of Employment Security
Statewide or federal resource; select the office or service for your address.
Illinois workNet
Statewide or federal resource; select the office or service for your address.
Work for Illinois
Statewide or federal resource; select the office or service for your address.
A Useful Starting Point
County facts and practical links for everyday questions.
Questions and Answers
Get to Know Henderson County
Find background and service information below, then follow the provider links for current details.
Oquawka is the county seat. Confirm the specific office and its current location before traveling.
Oquawka is the largest municipality listed in the county reference. Countywide statistics include other communities and unincorporated areas as well.
The 2020 Census counted 6,387 residents. This is a decennial count, not a current-year population estimate.
Henderson County was established in 1841. The county separated from Warren County in 1841. Its name traces through Henderson County in Kentucky, linking its early identity to migration into western Illinois.
The county covers approximately 395.2 sq mi (land and water; 2020 Census geography). This total includes both land and water, rather than land area alone.
Oquawka serves as the county seat along the Mississippi River. The county’s small communities connect western Illinois with the Burlington region across the state line.
Lakeview Nature Center is in Macomb, McDonough County. This is a regional option outside Henderson County. Check the provider’s current opening times and visitor information before traveling.
Use USPS ZIP Code Lookup with the full street address. A county boundary does not define a single postal delivery area.
Lakeview Nature Center is in Macomb, McDonough County. This is a regional option outside Henderson County. Check the provider’s current opening times and visitor information before traveling.
Argyle Lake State Park is in Colchester, McDonough County. This is a regional option outside Henderson County. Basic access is the free activity; extras may carry charges. Check the provider’s current opening times and visitor information before traveling.
Begin with the Illinois Department of Veterans Affairs to locate the appropriate service office, or the VA facility locator for federal facilities.
Meet Your County Advertisers
Local Connections for Everyday Needs
Explore Jones Septic Services for septic services.
My Local Guide
Find Something Fun
Explore Local PlacesPlan your next stop around current information from each place.
Kids’ Fun
- Lakeview Nature Center — Macomb — regional option in McDonough County
- Ball Fore Family Entertainment Center — Macomb — regional option in McDonough County
- Macombopoly — Macomb — regional option in McDonough County
Restaurants
- Vitale's Restaurant & Pizzeria — Macomb — regional option in McDonough County
- Old Dairy Cafe & Bakery — Macomb — regional option in McDonough County
- Larry A's Pizza — Macomb — regional option in McDonough County
Shopping & Retail
- New Copperfield's Book Service — Macomb — regional option in McDonough County
- Bergman Farm Supply — Carthage — regional option in Hancock County
- Nauvoo Nibbles — Nauvoo — regional option in Hancock County
Clothing & Boutiques
- Rural Bliss — Carthage — regional option in Hancock County
- Mother Goosebumps — Galesburg — regional option in Knox County
- Ada Laine Boutique — Princeville — regional option in Peoria County
Outdoor Fun
- Lakeview Nature Center — Macomb — regional option in McDonough County
- Spring Lake Park — Macomb — regional option in McDonough County
- Argyle Lake State Park — Colchester — regional option in McDonough County
Free Things To Do
- Argyle Lake State Park — Colchester — regional option in McDonough County; basic grounds/trail visit. Rentals, camping, special activities or events may cost extra.
- Nauvoo State Park — Nauvoo — regional option in Hancock County; basic grounds/trail visit. Rentals, camping, special activities or events may cost extra.
- Weinberg-King State Park — Augusta — regional option in Hancock County; basic grounds/trail visit. Rentals, camping, special activities or events may cost extra.
Make Time for Local DiscoveriesChoose Your Next Stop