Posey County is a county located in the U.S. state of Indiana. As of the most recent data available, the county has a population of approximately 27,061 people, with a population density of about 66.16 persons per square mile.
The county spans a total land area of 409.00 square miles (1,059.00 square kilometers). The administrative center and county seat is Mount Vernon, which often serves as a hub for local governance and services. The largest city within the county by population is Mount Vernon.
Geographically, Posey County experiences varied elevations, with its highest point at Cynthiana 440 ft and its lowest point at New Harmony 384 ft. The region operates in the UTC-6.