Mount Vernon is a city in and the county seat of Posey County, Indiana, United States. Located in the state's far southwestern corner, within …Mount Vernon is a city in and the county seat of Posey County, Indiana, United States. Located in the state's far southwestern corner, within 15 miles of both the southernmost or westernmost points, it is the westernmost city in the state. The southernmost is Rockport, located along the Ohio River about 40 miles to the southeast.
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