Perry County is a county located in the U.S. state of Mississippi. As of the 2020 census, the population was 11,511. The county seat is New Augusta. The county is named after the War of 1812 naval hero, Oliver Hazard Perry.

New Augusta is a town in Perry County, Mississippi. It is part of the Hattiesburg, Mississippi Metropolitan Statistical Area. The population was 644 at the 2010 census. It is the county seat of Perry County. New Augusta is located about two miles south of "Old" Augusta, which was the county seat until 1906.