| Information by State |
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| US Counties
| Illinois
| Union
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| Find a Lawyer in Union County: |
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| Union County, Illinois (IL) |
| Address: |
County Courthouse |
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P.O. Box H |
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Jonesboro, Illinois 62952-0478 |
| County Seat: |
Jonesboro |
| Phone: |
618-833-5711 |
| Website: |
www.shawneeheartland.com |
| Established: |
1818 |
| Area: |
416 sq mi |
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| Union County, Illinois Communities: |
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| Total Communities in Union County, Illinois: 6 |
| Population: |
| 17,290 |
17,112 |
16,985 |
16,841 |
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| 2015 * |
2016 * |
2017 * |
2018 * |
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| 17,808 |
17,695 |
17,613 |
17,545 |
17,407 |
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| 2010 |
2011 * |
2012 * |
2013 * |
2014 * |
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| * (U.S. Census Estimate) |
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