Duncan is a town in Spartanburg County, South Carolina, United States. The population was 3,181 at the 2010 census.GeographyDuncan is located at . According to the United States Census Bureau, the town has a total area of 3.5sqmi, all land.EtymologyThe town is named after its founder, Zachary Barnett Duncan.DemographicsAs of the census of 2000, there were 2,870 people, 1,125 households, and 811 families residing in the town. The population density was 818.4 people per square mile (315.7/km²). There were 1,274 housing units at an average density of 363.3 per square mile (140.1/km²). The racial makeup of the town was 65.68% White, 30.84% African American, 0.14% Native American, 0.66% Asian, 1.67% from other races, and 1.01% from two or more races. Hispanic or Latino of any race were 3.41% of the population.There were 1,125 households out of which 43.6% had children under the age of 18 living with them, 38.3% were married couples living together, 29.7% had a female householder with no husband present, and 27.9% were non-families. 24.3% of all households were made up of individuals and 9.3% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 2.96.
