***If you are having difficulties with this site and are using Internet Explorer 10 or later, please ensure that the site is added to the compatibility view list. Microsoft provides instructions for doing this here.***. Henderson County Home.
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.
Richland County, South Carolina. Richland County is a county located in the U.S. state of South Carolina. As of the 2010 census, the population was 384,504, making it the second-most populous county in South Carolina, behind only Greenville County. The county seat is Columbia, the state capital.