Demographics of Williamsburg County, South Carolina

Williamsburg County, South Carolina had 29,662 people on July 1, 2025, by the Census Bureau’s estimate: −1,252 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.

Williamsburg County, in four figures

29,662
Population: July 1, 2025, Vintage 2025 estimate.; −4.0%
Change since July 2020: −1,252 people.; 43.2 ±0.5
Median age: ACS 2020–⁠2024.; $46,213 ±$4,361
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.

Williamsburg County, South Carolina's population shrank 4.0% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Williamsburg 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

Williamsburg County, South Carolina's population shrank 4.0% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Williamsburg 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	30,914	100.0	100.0
2021	30,436	98.5	100.2
2022	30,154	97.5	100.7
2023	29,986	97.0	101.6
2024	29,801	96.4	102.5
2025	29,662	96.0	103.1

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Population of Williamsburg 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	30,914	−106	−61	0	−47
2021	30,436	−478	−283	+16	−223
2022	30,154	−282	−251	+36	−51
2023	29,986	−168	−186	+30	−8
2024	29,801	−185	−198	+57	−40
2025	29,662	−139	−205	+35	+28

Age, 2020–2024

The median age is 43.2 ±0.5: for men 40.1 ±1.1 and for women 46.8 ±0.9. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Williamsburg County by age, ACS 2020–2024
Age	People	Share	South Carolina	United States
Under 5	1,384 ±54	4.6% ±0.2	5.5% ±<0.1	5.6% ±<0.1
5 to 17	4,498 ±416	14.9% ±1.4	16.0% ±0.1	16.3% ±<0.1
18 to 24	2,278 ±345	7.5% ±1.1	9.1% ±0.1	9.1% ±<0.1
25 to 44	7,337 ±364	24.2% ±1.2	25.3% ±0.1	26.9% ±<0.1
45 to 64	7,918 ±365	26.1% ±1.2	25.2% ±0.1	24.8% ±<0.1
65 and over	6,867 ±466	22.7% ±1.5	18.9% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $46,213 ±$4,361, and income per person $25,713 ±$1,807, 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 Williamsburg County by income, ACS 2020–2024
Household income	Households	Share	South Carolina	United States
Under $25,000	4,011 ±485	32.6% ±3.8	17.0% ±0.2	14.6% ±<0.1
$25,000 to $49,999	2,756 ±386	22.4% ±3.1	19.6% ±0.3	16.7% ±<0.1
$50,000 to $74,999	2,401 ±386	19.5% ±3.1	17.0% ±0.3	15.5% ±<0.1
$75,000 to $99,999	1,091 ±244	8.9% ±2.0	13.1% ±0.2	12.6% ±<0.1
$100,000 to $149,999	1,222 ±265	9.9% ±2.1	16.4% ±0.2	17.5% ±<0.1
$150,000 to $199,999	431 ±127	3.5% ±1.0	8.0% ±0.2	9.6% ±<0.1
$200,000 or more	379 ±138	3.1% ±1.1	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 Williamsburg County by age, ACS 2020–2024
Age	Below poverty	Rate	South Carolina	United States
All ages	6,703 ±929	23.3% ±3.2	14.1% ±0.2	12.5% ±0.1
Under 18	1,533 ±341	26.2% ±5.4	19.4% ±0.4	16.1% ±0.1
18 to 59	2,834 ±567	20.1% ±3.8	13.1% ±0.2	11.6% ±0.1
60 and over	2,336 ±365	26.6% ±3.8	11.6% ±0.3	11.0% ±<0.1

Housing, 2020–2024

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Housing in Williamsburg County, ACS 2020–2024
Measure	Williamsburg County	South Carolina	United States
Housing units	14,907 ±38	2,443,039 ±311	143,775,355 ±10,234
Occupied	82.5% ±2.2	86.7% ±0.2	89.9% ±0.1
Vacant	17.5% ±2.2	13.3% ±0.2	10.1% ±0.1
Owner occupied	76.4% ±2.2	71.9% ±0.3	65.2% ±0.3
Renter occupied	23.6% ±3.0	28.1% ±0.3	34.8% ±0.1
Median home value	$104,500 ±$10,733	$259,000 ±$1,421	$332,700 ±$236
Median gross rent	$765 ±$45	$1,180 ±$9	$1,413 ±$2
Median year built	1985 ±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 Williamsburg County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	South Carolina	United States
Hispanic or Latino	758 ±0	2.5% ±<0.1	7.4% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	9,744 ±60	32.2% ±0.2	61.9% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	19,119 ±110	63.1% ±0.4	24.6% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	238 ±56	0.8% ±0.2	1.7% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	74 ±35	0.2% ±0.1	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 30	0% to 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	5 to 125	< 0.1% to 0.4%	0.5% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	284 ±113	0.9% ±0.4	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 Williamsburg County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	South Carolina	United States
Born in the state	24,702 ±670	81.6% ±2.2	52.6% ±0.2	57.3% ±<0.1
Born in another state	4,683 ±642	15.5% ±2.1	40.4% ±0.2	26.9% ±<0.1
Born a citizen outside the states	208 ±89	0.7% ±0.3	1.2% ±0.1	1.7% ±<0.1
Born abroad	689 ±207	2.3% ±0.7	5.8% ±0.1	14.1% ±<0.1
Naturalized citizens	55 to 261	0.2% to 0.9%	2.6% ±0.1	7.4% ±<0.1
Not citizens	531 ±220	1.8% ±0.7	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%.

Williamsburg County among the counties of South Carolina

32nd of 46 by population, July 2025. Every one is listed on the South Carolina page.

Counties of South Carolina near Williamsburg County in population, July 2025
County	July 2025	Change since 2020
Colleton County	39,382	+2.2%
Jasper County	38,533	+32.2%
Chester County	33,001	+2.2%
Clarendon County	31,043	+0.7%
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%

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