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Homefacts City Report. Duncan is located in Spartanburg County, SC. The population is 3,173, making Duncan the 8th largest city in Spartanburg County. There are 7 public schools in Duncan with an average Homefacts rating of B+. The total crime rate for Duncan is low, and there are 17 registered sex offenders residing in the city.
Duncan is located at 34Â°56â²6â³N 82Â°8â²5â³W / 34.93500Â°N 82.13472Â°W / 34.93500; -82.13472 (34.934983, -82.134801). According to the United States Census Bureau, the town has a total area of 3.5 square miles (9.1 km2), all of it land. The town is named after its founder, Zachary Barnett Duncan. As 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/kmÂ²).