Williamson County, Illinois
Williamson County is located in southern Illinois. The county seat is Marion, a regional retail center adjacent to Crab Orchard National Wildlife Refuge.
County Information
- County seat
- Marion
Courts serving Williamson County
- Judicial circuit
- 1st Circuit, District 5
- County seat
- Marion
- Courthouse
- Williamson County Courthouse
- Courthouse address
- 200 West Jefferson Street, Suite 260, Marion, IL 62959
- Court telephone
- (618) 997-1301
- Chief judge
- Not specified
Divisions and services listed for this court: Administrative Orders, Disability Information (ADA), Drug and Veteran's Court, e-Filing, Probation and Court Services, Self Represented Litigant Resources, Williamson County Directory.
Work and industry in Williamson County
- Aisin Mfg. — three auto parts plants first established in 2002 employing 1820 employees
- VA Medical Center — established in 1942, employs 1500 workers
- Heartland Regional Medical Center — formerly Marion Memorial Hospital first established in 1953, employing 600 employees
- Pepsi / MidAmerica — soft drinks in operation since 1935 employing 600 workers
- Blue Cross/Blue Shield — claims processing center established in 1983 employing 350 employees
1,563 business establishments, led by retail trade (230), health care and social assistance (212), other services (179), accommodation and food services (156), construction (145). 2022 County Business Patterns.
Getting to and around Williamson County
Interstate 24 · Interstate 57 · U.S. Highway 45 · Illinois Route 13 · Illinois Route 37 · Illinois Route 148 · Illinois Route 149 · Illinois Route 166
County Clerk · County Treasurer · States Attorney · Circuit Clerk · County Coroner · County Sheriff
About Williamson County
- Marion Cultural and Civic Center
- Southern Illinois Roller Girls bouts
- Marion Stadium
- Crab Orchard National Wildlife Refuge
- Lake of Egypt
- Shawnee National Forest
Community information compiled from api.census.gov, en.wikipedia.org, illinoiscourts.gov, williamsoncountyil.gov and reviewed 2026-09-10.
Legal Services in Williamson County
Black, Ballard, McDonald, P.C. represents Williamson County clients in the following practice areas:
Williamson County sits in Illinois's 1st Circuit, District 5, and county matters are filed at the Williamson County Courthouse.
Contact the Firm
The office is located in Mt. Vernon, Illinois. Contact an attorney to discuss your Williamson County matter.