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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 Municipal Court. Duncan is perhaps the smallest city of Spartanburg. there is only one Public School here. There are rumors that the city was building a new water pool and would be ready until Memorial Day. Apparently it became true that it is a rumor and the rumor did not become true.