Population11,742 (2020 Census)
River Crossings Connect Towns and Prairie Fields
Marshall County, IllinoisThe Illinois River divides the county, connecting the settings of Lacon and Henry. Communities on either side share access to a wider central Illinois transportation network. This guide brings together a starting point for county information, public services and local connections. Begin with Lacon, 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.
Marshall County at a Glance
Population11,742 (2020 Census)
County SeatLacon
Largest MunicipalityHenry
Established1839
ZIP Codes17 ZIP codes wholly or partly within the county (checked October 4, 2026)
Total Area398.5 sq mi (land and water; 2020 Census geography)
Major RoutesInterstate 39; U.S. Highway 51; Illinois Route 17; Illinois Route 18; Illinois Route 26
Area Codes309 / 861 (common local area codes)
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Local Connections for Everyday Needs
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Discover Marshall County
Marshall County
The county was formed from Putnam County in 1839 and named for Chief Justice John Marshall. An eastern boundary extension in 1843 brought it to its present size. Today, Lacon remains the county seat, while Henry is its largest municipality. The 2020 Census counted 11,742 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 Marshall County extends beyond a single town center. Illinois River crossings 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 1839, Marshall 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
Illinois River crossings help distinguish Marshall County. Its county seat, Lacon, 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 Marshall County.
Explore the towns, follow the stories, make local connections.
A Look Around
Scenes from Marshall County
Places and details that tell a local story.
Keep These Businesses in Mind
Start with a Direct Conversation
Contact Geiger True Value Hardware 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) 246-2350
Schools
County & Local Resources
Hospitals and Health
County & Local Resources
Carle Eureka Hospital
Regional option in Woodford County
Address 101 S MAJOR ST, Eureka
Phone (309) 467-2371
Osf Saint Clare Medical Center
Regional option in Bureau County
Address 530 PARK AVENUE EAST, Princeton
Phone (815) 875-2811
Carle Health Methodist Hospital
Regional option in Peoria County
Address 221 N E GLEN OAK AVE, Peoria
Phone (309) 672-5522
Saint Francis Medical Center
Regional option in Peoria County
Address 530 NE GLEN OAK AVE, Peoria
Phone (309) 655-2000
Carle Health Proctor Hospital
Regional option in LaSalle County
Address 5409 N KNOXVILLE AVE, Peoria
Phone (309) 691-1000
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
Marshall State Fish and Wildlife Area
Lacon, Marshall County. Check facilities and access notices.
Donnelley/Depue State Fish and Wildlife Area & Complex
De Pue — regional option in Bureau County. Check facilities and access notices.
Mautino State Fish and Wildlife Area
Sheffield — regional option in Bureau County. Check facilities and access notices.
Rock Island Trail State Park
Wyoming — regional option in Stark County. Check facilities and access notices.
Jubilee College State Park
Brimfield — regional option in Peoria County. Check facilities and access notices.
Trails
County & Local Resources
Rock Island Trail State Park
Wyoming — regional option in Stark County. Check trail access and permitted uses.
Forest Park Nature Center
Peoria — regional option in Peoria County. Check trail access and permitted uses.
Grandview Drive – The "World's Most Beautiful Drive"
Peoria Heights — regional option in Peoria County. Check trail access and permitted uses.
Jubilee College State Park
Brimfield — regional option in Peoria County. Check trail access and permitted uses.
Bicycle Safety Town
Peoria — regional option in Peoria 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
Henry Public Library
Address 702 Front Street Post Office Box 183 Henry , IL 61537-0183
Phone 309-364-2516
Bradford Public Library District
Regional library in Stark County; check borrowing eligibility
Address 111 South Peoria Street Post Office Box 249 Bradford , IL 61421-0249
Phone 309-897-8400
Toulon Public Library District
Regional library in Stark County; check borrowing eligibility
Address 617 East Jefferson Street Toulon , IL 61483-8099
Phone 309-286-5791
Wyoming Public Library District
Regional library in Stark County; check borrowing eligibility
Address 119 North Seventh Street Wyoming , IL 61491-1307
Phone 309-695-2241
Courts
County & Local Resources
Marshall County Circuit Clerk SMS Terms and Conditions
Official Marshall County office information.
Marshall County Circuit Clerk SMS Privacy Policy
Official Marshall County office information.
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 Marshall County
Find background and service information below, then follow the provider links for current details.
Lacon is the county seat. Marshall County Government provides county office information; check the office destination before traveling.
Henry is the largest municipality listed in the county reference. Countywide statistics include other communities and unincorporated areas as well.
The 2020 Census counted 11,742 residents. This is a decennial count, not a current-year population estimate.
Marshall County was established in 1839. The county was formed from Putnam County in 1839 and named for Chief Justice John Marshall. An eastern boundary extension in 1843 brought it to its present size.
The county covers approximately 398.5 sq mi (land and water; 2020 Census geography). This total includes both land and water, rather than land area alone.
The Illinois River divides the county, connecting the settings of Lacon and Henry. Communities on either side share access to a wider central Illinois transportation network.
Forest Park Nature Center is in Peoria, Peoria County. This is a regional option outside Marshall 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.
Marshall State Fish and Wildlife Area is in Lacon, Marshall County. Check the provider’s current opening times and visitor information before traveling.
Marshall State Fish and Wildlife Area is in Lacon, Marshall 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 Geiger True Value Hardware for hardware and home projects.
My Local Guide
Find Something Fun
Explore Local PlacesPlan your next stop around current information from each place.
Kids’ Fun
- Forest Park Nature Center — Peoria — regional option in Peoria County
- Peoria Playhouse Children's Museum — Peoria — regional option in Peoria County
- Peoria Zoo — Peoria — regional option in Peoria County
Restaurants
- The Fox Pub & Cafe — Peoria — regional option in Peoria County
- Brickhouse BBQ Burgers & Brew — Washington — regional option in Tazewell County
- Blue Margaritas — Oglesby — regional option in LaSalle County
Shopping & Retail
- Hornbaker Gardens — Princeton — regional option in Bureau County
- Junction City Shopping Center — Peoria — regional option in Peoria County
- Lost Art Design & Print — Peoria — regional option in Peoria County
Clothing & Boutiques
- Stems by Allison — Chillicothe — regional option in Peoria County
- Ada Laine Boutique — Princeville — regional option in Peoria County
- Lucky Charlie — Washington — regional option in Tazewell County
Outdoor Fun
- Marshall State Fish and Wildlife Area — Lacon, Marshall County
- Three Sisters Park — Chillicothe — regional option in Peoria County
- Eagle Landing Park — Chillicothe — regional option in Peoria County
Free Things To Do
- Marshall State Fish and Wildlife Area — Lacon, Marshall County; basic grounds/trail visit. Rentals, camping, special activities or events may cost extra.
- Donnelley/Depue State Fish and Wildlife Area & Complex — De Pue — regional option in Bureau County; basic grounds/trail visit. Rentals, camping, special activities or events may cost extra.
- Rock Island Trail State Park — Wyoming — regional option in Stark County; basic grounds/trail visit. Rentals, camping, special activities or events may cost extra.
Make Time for Local DiscoveriesChoose Your Next Stop