| County: | Simpson County |
| State: | Mississippi |
| Founded: | 1824 |
| Named For: | Josiah Simpson |
| Area Total Sq Mi: | 590 |
| Area Land Sq Mi: | 589 |
| Area Water Sq Mi: | 1.3 |
| Area Percentage: | 0.2 |
| Population As Of: | 2020 |
| Population Total: | 25949 |
| Population Density Sq Mi: | auto |
| Ex Image: | Simpson County Mississippi Courthouse.jpg |
| Ex Image Cap: | Simpson County courthouse in Mendenhall |
| District: | 3rd |
| Time Zone: | Central |
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.[1] The county seat is Mendenhall.[2] The county is named for Josiah Simpson (1787-1817),[3] a territorial judge who also served as a delegate to Mississippi's Constitutional Convention.[4]
Simpson County is part of the Jackson, MS Metropolitan Statistical Area.
According to the U.S. Census Bureau, the county has a total area of, of which is land and (0.2%) is water.[5]
| White (non-Hispanic) | 15,928 | 61.38% | |
| Black or African American (non-Hispanic) | 8,803 | 33.92% | |
| Native American | 36 | 0.14% | |
| Asian | 84 | 0.32% | |
| Pacific Islander | 2 | 0.01% | |
| Other/Mixed | 710 | 2.74% | |
| Hispanic or Latino | 386 | 1.49% |
Simpson County School District is the local school district.[7]