Duncan is a very small town located in the state of South Carolina. With a population of 4,276 people and two associated neighborhoods, Duncan is the 89th largest community in South Carolina. There's nothing like the smell of a brand new house, and in Duncan, you'll find that a large proportion of houses were recently built. New growth in residential real estate is an indication that people are choosing to move to Duncan, and putting down their money on brand new construction. Duncan’s real estate is, on average, some of the newest in the nation. Duncan does seem to be experiencing an influx of affluent people, because the median household income is $58,112.00.

Being a small town, Duncan does not have a public transit system used by locals to get to and from work.

The education level of Duncan citizens is substantially higher than the typical US community, as 31.56% of adults in Duncan have at least a bachelor's degree.

The per capita income in Duncan in 2022 was $26,367, which is middle income relative to South Carolina, and lower middle income relative to the rest of the US. This equates to an annual income of $105,468 for a family of four.

Duncan is an extremely ethnically-diverse town. The people who call Duncan home describe themselves as belonging to a variety of racial and ethnic groups. The greatest number of Duncan residents report their race to be White, followed by Black or African-American. Important ancestries of people in Duncan include English, German, Irish, African, and Italian.

The most common language spoken in Duncan is English. Other important languages spoken here include Italian and Hungarian.