| Information by State |
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| US Counties
| Illinois
| Mason
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| Find a Lawyer in Mason County: |
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| Mason County, Illinois (IL) |
| Address: |
County Courthouse |
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P.O. Box 77 |
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Havana, Illinois 62644-0077 |
| County Seat: |
Havana |
| Phone: |
309-543-6661 |
| Fax: |
309-543-2085 |
| Website: |
www.masoncountyil.org |
| Established: |
1841 |
| Area: |
539 sq mi |
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| Mason County, Illinois Communities: |
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| Total Communities in Mason County, Illinois: 15 |
| Population: |
| 13,861 |
13,673 |
13,688 |
13,565 |
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| 2015 * |
2016 * |
2017 * |
2018 * |
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| 14,666 |
14,469 |
14,320 |
14,144 |
14,102 |
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| 2010 |
2011 * |
2012 * |
2013 * |
2014 * |
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| * (U.S. Census Estimate) |
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