According to theU.S. Census Bureau, the county has a total area of 549 square miles (1,420 km2), of which 542 square miles (1,400 km2) is land and 6.2 square miles (16 km2) (1.1%) is water.[4]
As of the2020 census, the county had a population of 24,441. The median age was 40.8 years. 23.6% of residents were under the age of 18 and 19.3% of residents were 65 years of age or older. For every 100 females there were 96.0 males, and for every 100 females age 18 and over there were 94.2 males age 18 and over.[12][13]
25.5% of residents lived in urban areas, while 74.5% lived in rural areas.[14]
There were 9,520 households in the county, of which 31.3% had children under the age of 18 living in them. Of all households, 45.3% were married-couple households, 18.8% were households with a male householder and no spouse or partner present, and 31.0% were households with a female householder and no spouse or partner present. About 28.3% of all households were made up of individuals and 13.8% had someone living alone who was 65 years of age or older.[12]
There were 11,080 housing units, of which 14.1% were vacant. Among occupied housing units, 78.1% were owner-occupied and 21.9% were renter-occupied. The homeowner vacancy rate was 1.5% and the rental vacancy rate was 10.5%.[12]
Marion County is a Republican stronghold, having only voted for a Democrat once since the 1960s. Its Republican tilt has been increasingly evident in recent years, with the 2024 presidential election showing the strongest Republican support in the county since 1972.
United States presidential election results for Marion County, Mississippi[17]
Expose, an unincorporated area of Marion County that was founded by Harry Solomon Expose (born 1861), a community leader who owned a general store and served as postmaster.[18]Monroe Work'sNegro Yearbook listed it among "Negro Towns and Settlements in the United States." Football greatWalter Payton's mother Alyne Sibley Payton was born in Expose on January 14, 1926.[19]