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. Much of the housing stock in Duncan was built relatively recently. The construction of new real estate can often be taken as an indication that the local Duncan economy is robust, and that jobs or other amenities are attracting an influx of new residents. This seems to be the case in Duncan, where the median household income is $58,112.00.

As is often the case in a small town, Duncan doesn't have a public transportation system that people use for their commute.

The overall 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, and the average American community has 21.84%.

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.