St. Louis County, Missouri
St. Louis County surrounds the independent city of St. Louis in eastern Missouri. The county seat is Clayton. The firm serves Missouri clients from the Mt. Vernon, Illinois office.
County Information
- County seat
- Clayton
Courts serving St. Louis County
- Judicial circuit
- 20th Judicial Circuit
- County seat
- Clayton
- Courthouse
- St. Clair County Courthouse
- Courthouse address
- 10 Public Square, Belleville, IL 62220
- Court telephone
- (618) 277-6600
- Chief judge
- Mary Berneking
Divisions and services listed for this court: Copier, Court Disability Coordinator, Digital Recording, E-filing Kiosk, Electronic Device Policy, Food (Vending/Other), Foreclosure Mediation Program, Internet, Lactation Rooms, Language Access, Law Library, Local Rules / Orders, Mandatory Arbitration Program, Mobile Devices Allowed, Printer, Public Transportation, Remote Proceedings, Self-Help Center.
Work and industry in St. Louis County
- Washington University in St. Louis — 19,617 employees
- Boeing Defense, Space & Security — 15,796 employees
- Mercy Healthcare — 15,084 employees
- SSM Healthcare — 14,226 employees
- Schnucks Markets, Inc. — 8,768 employees
- Charter Communications — 6,230 employees
- Special School District of St. Louis County — 5,890 employees
- Edward Jones — 5,514 employees
- St. Louis County Government — 4,994 employees
- Centene Corporation — 4,677 employees
31,107 business establishments, led by health care and social assistance (6,169), professional, scientific, and technical services (3,444), retail trade (3,243), other services (2,643), finance and insurance (2,530). 2022 County Business Patterns.
Getting to and around St. Louis County
I-44 · I-55 · I-64 · I-70 · I-170 · I-255 · I-270 · US 50 · US 61 · US 67 · Route 21 · Route 30 · Route 100 · Route 115 · Route 141 · Route 180 · Route 231 · Route 267 · Route 340 · Route 364 · Route 366 · Route 367 · Route 370
St. Louis County Library · Washington University in St. Louis · St. Louis Community College
About St. Louis County
- Creve Coeur Park
- Babler State Park
- Castlewood State Park
- Route 66 State Park
- National Museum of Transportation
Community information compiled from api.census.gov, en.wikipedia.org, illinoiscourts.gov and reviewed 2026-09-10.
Legal Services in St. Louis County
Black, Ballard, McDonald, P.C. represents St. Louis County clients in the following practice areas:
St. Louis County sits in Illinois's 20th Judicial Circuit, and county matters are filed at the St. Clair County Courthouse.
Contact the Firm
The office is located in Mt. Vernon, Illinois. Contact an attorney to discuss your St. Louis County matter.