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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 Clerk. Find Duncan South Carolina clerk, including county, city, and circuit clerk, and clerk of court. Clerks provide information on public court records and legal documents, criminal, jail, and arrest records, marriage licenses, divorce, judicial, and probate records, businesses liens, notary services, real estate taxes and voter registration services.