Simpson County is a county located in the U.S. state of Mississippi. Its western border is formed by the Pearl River, an important transportation route in the 19th century. As of the 2020 census, the population was 25,949. The county seat is Mendenhall. The county is named for Josiah Simpson (1787-1817), a territorial judge who also served as a delegate to Mississippi's Constitutional Convention. Simpson County is part of the Jackson, MS Metropolitan Statistical Area.

Geography

According to the U.S. Census Bureau, the county has a total area of 590 sqmi, of which 589 sqmi is land and 1.3 sqmi (0.2%) is water.

Major highways

Adjacent counties

Demographics

As of the 2020 United States census, there were 25,949 people, 9,486 households, and 6,617 families residing in the county.

Communities

Cities

Town

Village

Unincorporated communities

Ghost town

Politics

Education

Simpson County School District is the local school district. It is in the district of Copiah–Lincoln Community College, and has been since 1934. The district maintains the Simpson County Center.