Duncan

County:: Spartanburg County
County Seat:: No
Area (mi²):: 6.269
State:: South Carolina

Duncan is a town located in Spartanburg County, South Carolina. Duncan has a 2025 population of 4,675. Duncan is currently growing at a rate of 2.68% annually and its population has increased by 15.01% since the most recent census, which recorded a population of 4,065 in 2020.

The average household income in Duncan is $71,800 with a poverty rate of 17.09%.The median age in Duncan is 30.9 years: 30.4 years for males, and 32.3 years for females.

Demographics

The racial composition of Duncan includes 55.93% White, 40.6% Black or African American, and smaller percentages for Two or more races, other race and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	2,335	55.93%
Black or African American	1,695	40.6%
Two or more races	97	2.32%
Other race	48	1.15%

Duncan Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Duncan's average per capita income is $39,658. Household income levels show a median of $51,596. The poverty rate stands at 17.09%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$69,431	-
Families	$69,239	$75,338
Households	$51,596	$71,800
Non Families	$34,102	$63,726

$39,658

Average Income

$51,596

Median Household Income

17.09%

Poverty Rate