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Posey County Indiana Last Updated: 08/18/2026 |
| Posey County is located in the southernmost, southwesternmost, and westernmost parts of the state of Indiana. The county's southern border is formed by the Ohio River, and its western border by the Wabash River, a tributary of the Ohio River. As of 2020, the population was 25,222. The county seat is Mount Vernon. The county is known for its historic New Harmony estate. | |
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