With 4,310 people, Duncan is a city in South Carolina. The population has risen by half since 2000, adding 1,440 people. This skews young, with a median age of 34.4. The typical home is worth $211,400, having roughly tripled since 2000. Households here earn about 24% less than in South Carolina as a whole. 57% of homes are owner-occupied.
At a glance
Lower income
median household income $52,500, below the US median
US median: $82,259
Younger
median age 34.4
US median: 38.9
Less educated
29% hold a bachelor's degree
US average: 36%
Less affordable
home values up 65%, inflation adjusted
US median home: $376,019
Unique to this place
What stands out about Duncan
What changed most since 1990
Population2,152 → 4,310(+100%)US over the same years: +35%
Black share20.2% → 32.6%(+12.5 pts)US over the same years: +0.2 pts
Adults with a bachelor's degree4.4% → 29.5%(+25.1 pts)US over the same years: +15.3 pts
Shares are "alone or in combination": a person with both Medicare and Medicaid counts in each, so categories overlap and do not sum to 100%.
Section 09 · Service history
Veterans
Veterans by period of service, 2024
Gulf War (2001 or later)81.3%(113)
US avg: 26.4%
Gulf War (1990s)0%(0)
US avg: 24.3%
Vietnam era18.7%(26)
US avg: 33.1%
Korean War0%(0)
US avg: 4.5%
World War II0%(0)
US avg: 1%
Share of the 139 veterans here. A veteran who served across eras counts in each, so shares can total more than 100%. Peacetime-only service is included in the total but not shown as an era.
BAR + DOT: THIS PLACE · TICK: US AVERAGE
Over time
Duncan, decade by decade
Duncan population, inflation-adjusted income and home value, education, and diversity by year
Year
Population
Median household income
Median home value
Bachelor's degree+
Diversity score
1990
2,152
$55,406
$114,723
4.4%
42.0
2000
2,870
$50,959
$127,880
7.2%
61.8
2010
3,181
$50,950
$147,166
11.4%
72.2
2020
4,041
$60,602
$141,687
20.1%
77.7
2024
4,310
$52,500
$211,400
29.5%
73.8
Census years come from the decennial census and the latest year from the American Community Survey, so part of any change between those two rows can reflect the different surveys. Dollar figures are adjusted for inflation to 2024 dollars; a figure ending in "+" was at the Census Bureau's reporting cap that year. The diversity score runs from 0 to 100; see how it's calculated.
