Mullins is a city in Marion County, South Carolina, United States. As of the 2010 census, the city population was 4,663. Incorporated on March 4…Mullins is a city in Marion County, South Carolina, United States. As of the 2010 census, the city population was 4,663. Incorporated on March 4, 1872, Mullins was named after Col. William S. Mullins, who served as a representative for Marion County in the South Carolina State Legislature from 1852 to 1866.
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