| Information by State |
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| US Counties
| Illinois
| Williamson
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| Find a Lawyer in Williamson County: |
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| Williamson County, Illinois (IL) |
| Address: |
County Courthouse |
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200 West Jefferson Street |
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Marion, Illinois 62959-3061 |
| County Seat: |
Marion |
| Phone: |
618-997-1301 |
| Fax: |
618-993-2071 |
| Website: |
www.williamsoncountyil.gov |
| Established: |
1839 |
| Area: |
424 sq mi |
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| Williamson County, Illinois Communities: |
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| Total Communities in Williamson County, Illinois: 15 |
| Population: |
| 67,440 |
67,480 |
67,107 |
67,056 |
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| 2015 * |
2016 * |
2017 * |
2018 * |
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| 66,357 |
66,726 |
66,774 |
67,447 |
67,410 |
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| 2010 |
2011 * |
2012 * |
2013 * |
2014 * |
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| * (U.S. Census Estimate) |
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Contact Us. |
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