| Information by State |
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| US Counties
| Illinois
| Clay
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| Find a Lawyer in Clay County: |
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| Clay County, Illinois (IL) |
| Address: |
County Courthouse |
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P.O. Box 160 |
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Louisville, Illinois 62858-0160 |
| County Seat: |
Louisville |
| Phone: |
618-665-3626 |
| Website: |
claycountyillinois.org |
| Established: |
1824 |
| Area: |
469 sq mi |
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| Clay County, Illinois Communities: |
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| Total Communities in Clay County, Illinois: 14 |
| Population: |
| 13,402 |
13,315 |
13,272 |
13,253 |
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| 2015 * |
2016 * |
2017 * |
2018 * |
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| 13,815 |
13,725 |
13,715 |
13,556 |
13,446 |
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| 2010 |
2011 * |
2012 * |
2013 * |
2014 * |
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| * (U.S. Census Estimate) |
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