Local answers · official sources

County of Williamson

For court-service inquiries, use the circuit clerk’s office below. This is not the county election clerk or a judge’s personal contact.

Census ID 207767 · Census county field: Williamson · Functioning in the 2025 inventory

For residents

Contact the circuit clerk

1st Judicial Circuit · Directory checked 2026-09-13

Williamson County Circuit Clerk

618-997-1301. Published mailing address: 200 West Jefferson, Suite 100, Marion, Illinois 62959-2494. Confirm office hours and where to attend or file with the clerk before visiting. This directory does not establish a hearing location, judge roster, or current officeholder term.

Illinois circuit-clerk office directory

Call the Williamson circuit clerk 618-997-1301 Check the official directory Confirm the office’s latest published details with Illinois Courts.

Sources & verification dates

Illinois circuit-clerk office directory ↗State of Illinois Office of the Illinois Courts · Checked 2026-09-13

The source record

Listed as functioning in 2025.

The Census ACTIVE field is Y for this record.

Census ID: 207767
Record type: General-purpose government
Classification: County
Status: Functioning

2025 Census snapshot

Reported contact and location fields

Reported mailing address407 N MONROE ST STE 119 · MARION, IL · 62959-2321

Reported contact roleAdministrator

A role label, not a verified person’s name.

Census county fieldWilliamson

Reported websiteOpen listed website ↗

These are inventory fields, not newly verified office contacts. A county field or mailing address does not establish the exact service boundary.

Published context

Scale and parent relationship

Population estimate66,7062023

About these sources and their limits

Evidence boundary

What each source proves—and what it does not.

Established by the published records

The entity or system appears in the 2025 Census listing.
Its Census category, identifier, and functioning/dormant field.
Only the location, function, population, enrollment, and contact fields actually published.

Not established by these records

Whether each governing or administrative role is elected, appointed, or mixed.
The exact geographic service boundary or that a reported website remains current.