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, Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Black or African American

Two or more races

Other race

Native American

Asian

Native Hawaiian or Pacific Islander

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%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%

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