Fordyce is a city in Dallas County, Arkansas, United States. The population was 4,300 at the 2010 census, down from 4,799 at the 2000 census.The city is the county seat, home to the 1911 Dallas County Courthouse.Within Fordyce there are 19 sites listed on the National Register of Historic Places, including the Fordyce Home Accident Insurance Company. The town was named for Samuel W. Fordyce.