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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.
The city of Duncanville is located in Dallas County. The 2010 Census gave Dallas County a population of 2,368,139 people. This means that Duncanville had 1.63% of the county's total population, making it Dallas' 12th most populous community. At the same time, Texas had a population of 25,145,561 people, meaning that Duncanville had 0.15% of the total population of Texas - making it the state's 74th most populous community.