Demographics of Marlboro County, South Carolina

Marlboro County, South Carolina had 25,488 people on July 1, 2025, by the Census Bureau’s estimate: −1,006 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Marlboro County, in four figures

25,488
Population: July 1, 2025, Vintage 2025 estimate.; −3.8%
Change since July 2020: −1,006 people.; 41.7 ±0.4
Median age: ACS 2020–⁠2024.; $34,301 ±$2,981
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Marlboro County, South Carolina's population shrank 3.8% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Marlboro County, South Carolina's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

Source: The Census Bureau

About this chart

The figures

Marlboro County, South Carolina's population shrank 3.8% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Marlboro County, South Carolina's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	26,494	100.0	100.0
2021	26,077	98.4	100.2
2022	25,952	98.0	100.7
2023	25,745	97.2	101.6
2024	25,544	96.4	102.5
2025	25,488	96.2	103.1

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Population of Marlboro County, South Carolina on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	26,494	−173	−27	0	−127
2021	26,077	−417	−199	−2	−222
2022	25,952	−125	−178	+3	+64
2023	25,745	−207	−155	+17	−62
2024	25,544	−201	−101	+13	−111
2025	25,488	−56	−88	−10	+41

Age, 2020–2024

The median age is 41.7 ±0.4: for men 40.1 ±0.7 and for women 44.8 ±0.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Marlboro County by age, ACS 2020–2024
Age	People	Share	South Carolina	United States
Under 5	1,335 ±74	5.1% ±0.3	5.5% ±<0.1	5.6% ±<0.1
5 to 17	3,836 ±342	14.8% ±1.3	16.0% ±0.1	16.3% ±<0.1
18 to 24	2,035 ±346	7.8% ±1.3	9.1% ±0.1	9.1% ±<0.1
25 to 44	6,965 ±278	26.8% ±1.1	25.3% ±0.1	26.9% ±<0.1
45 to 64	6,845 ±359	26.4% ±1.4	25.2% ±0.1	24.8% ±<0.1
65 and over	4,959 ±378	19.1% ±1.5	18.9% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $34,301 ±$2,981, and income per person $21,486 ±$1,597, in 2024 dollars. The median is $69,324 ±$570 in South Carolina and $80,734 ±$166 in the United States.

Households by income

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Households in Marlboro County by income, ACS 2020–2024
Household income	Households	Share	South Carolina	United States
Under $25,000	3,755 ±427	38.4% ±4.1	17.0% ±0.2	14.6% ±<0.1
$25,000 to $49,999	2,566 ±362	26.2% ±3.6	19.6% ±0.3	16.7% ±<0.1
$50,000 to $74,999	1,239 ±216	12.7% ±2.2	17.0% ±0.3	15.5% ±<0.1
$75,000 to $99,999	911 ±208	9.3% ±2.1	13.1% ±0.2	12.6% ±<0.1
$100,000 to $149,999	823 ±171	8.4% ±1.7	16.4% ±0.2	17.5% ±<0.1
$150,000 to $199,999	308 ±137	3.1% ±1.4	8.0% ±0.2	9.6% ±<0.1
$200,000 or more	187 ±90	1.9% ±0.9	8.9% ±0.2	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Marlboro County by age, ACS 2020–2024
Age	Below poverty	Rate	South Carolina	United States
All ages	6,706 ±738	28.5% ±3.1	14.1% ±0.2	12.5% ±0.1
Under 18	2,015 ±323	39.3% ±5.1	19.4% ±0.4	16.1% ±0.1
18 to 59	2,770 ±465	23.6% ±3.7	13.1% ±0.2	11.6% ±0.1
60 and over	1,921 ±294	28.8% ±4.0	11.6% ±0.3	11.0% ±<0.1

Housing, 2020–2024

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Housing in Marlboro County, ACS 2020–2024
Measure	Marlboro County	South Carolina	United States
Housing units	12,077 ±86	2,443,039 ±311	143,775,355 ±10,234
Occupied	81.1% ±3.0	86.7% ±0.2	89.9% ±0.1
Vacant	18.9% ±2.9	13.3% ±0.2	10.1% ±0.1
Owner occupied	63.0% ±2.7	71.9% ±0.3	65.2% ±0.3
Renter occupied	37.0% ±4.1	28.1% ±0.3	34.8% ±0.1
Median home value	$82,000 ±$6,245	$259,000 ±$1,421	$332,700 ±$236
Median gross rent	$689 ±$46	$1,180 ±$9	$1,413 ±$2
Median year built	1977 ±2	1992 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Marlboro County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	South Carolina	United States
Hispanic or Latino	708 ±0	2.7% ±<0.1	7.4% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	9,934 ±191	38.2% ±0.7	61.9% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	12,400 ±364	47.7% ±1.4	24.6% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	4 to 210	< 0.1% to 0.8%	1.7% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	768 ±130	3.0% ±0.5	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 26	0% to 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	11 to 353	< 0.1% to 1.4%	0.5% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	1,876 ±388	7.2% ±1.5	3.7% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Marlboro County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	South Carolina	United States
Born in the state	17,364 ±669	66.8% ±2.6	52.6% ±0.2	57.3% ±<0.1
Born in another state	7,812 ±658	30.1% ±2.5	40.4% ±0.2	26.9% ±<0.1
Born a citizen outside the states	74 to 418	0.3% to 1.6%	1.2% ±0.1	1.7% ±<0.1
Born abroad	553 ±167	2.1% ±0.6	5.8% ±0.1	14.1% ±<0.1
Naturalized citizens	83 to 357	0.3% to 1.4%	2.6% ±0.1	7.4% ±<0.1
Not citizens	333 ±93	1.3% ±0.4	3.2% ±0.1	6.8% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Marlboro County among the counties of South Carolina

36th of 46 by population, July 2025. Every one is listed on the South Carolina page.

Counties of South Carolina near Marlboro County in population, July 2025
County	July 2025	Change since 2020
Edgefield County	29,808	+16.1%
Williamsburg County	29,662	−4.0%
Marion County	28,242	−2.9%
Dillon County	27,458	−2.9%
Union County	26,799	−1.4%
Marlboro County	25,488	−3.8%
Abbeville County	24,836	+2.3%
Barnwell County	20,653	+0.4%
Fairfield County	20,340	−2.6%
Saluda County	19,680	+4.0%
Hampton County	18,174	−1.9%

Elsewhere on the site

Rankings this appears in

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Compiled automatically from Census Bureau population estimates — counties and Puerto Rico municipios, with components of change and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026