Marlboro County Demographics

A map of Marlboro County's Population by Race

Race	2024 Pop	2020 Pop	2024 %	2020 %
Black	12,400	13,302	47.7%	49.9%
White	9,934	10,556	38.2%	39.6%
Multiracial	1,876	959	7.2%	3.6%
Native American/Other	950	1,176	3.7%	4.4%
Hispanic	708	575	2.7%	2.2%
Asian	107	99	0.4%	0.4%

Marlboro County, South Carolina has an estimated population of 25,975, a slight decrease from the 26,667 recorded in the 2020 Census. The population is 47.7% Black, 38.2% White, 7.2% Multiracial, 3.7% Native American/Other, 2.7% Hispanic, and 0.4% Asian. This demographic dot map shows the population of Marlboro County, with one dot drawn for each person counted by the Census, color-coded by race.

Marlboro has become more racially diverse since the 2020 Census. It is considerably more diverse than South Carolina overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Marlboro County, that probability was 59.1% in 2020 and 61.9% in the most recent ACS estimates.

Marlboro County is ranked the 36th most populous county in South Carolina, out of 46 counties. Marlboro County was ranked the 35th most populous county in the 2020 Census.

Marlboro County's White Population

9,934 residents of Marlboro County, or 38.2% of the population, identify as White. The share of White residents in Marlboro County is significantly lower than in South Carolina overall, where 61.9% of the population is White. Marlboro County ranks 40th statewide in terms of White residents as a share of the population, out of 46 counties.

Since the 2020 Census, Marlboro County's White population has declined by an estimated 5.9%. White residents' share of Marlboro County's population has decreased from 39.6% to 38.2%.

Marlboro County is less White than neighboring Scotland County (40.1% White), Dillon County (44.5% White), Darlington County (53.1% White), Richmond County (54.7% White), and Chesterfield County (58.4% White).

Marlboro County's Black Population

12,400 residents of Marlboro County, or 47.7% of the population, identify as Black. The share of Black residents in Marlboro County is significantly higher than in South Carolina overall, where 24.6% of the population is Black. Marlboro County ranks 9th statewide in terms of Black residents as a share of the population, out of 46 counties.

Since the 2020 Census, Marlboro County's Black population has declined by an estimated 6.8%. Black residents' share of Marlboro County's population has decreased from 49.9% to 47.7%.

Marlboro County is more Black than neighboring Scotland County (37% Black), Dillon County (45.3% Black), Darlington County (40.6% Black), Richmond County (31.2% Black), and Chesterfield County (30% Black).

Marlboro County's Asian Population

107 residents of Marlboro County, or 0.4% of the population, identify as Asian. The share of Asian residents in Marlboro County is comparable to the share in South Carolina overall, where 1.7% of the population is Asian. Marlboro County ranks 38th statewide in terms of Asian residents as a share of the population, out of 46 counties.

Since the 2020 Census, Marlboro County's Asian population has grown by an estimated 8.1%. Asian residents' share of Marlboro County's population has remained roughly unchanged at 0.4%.

Marlboro County is more Asian than neighboring Dillon County (0% Asian). Marlboro County is less Asian than neighboring Scotland County (1.3% Asian), Darlington County (0.6% Asian), Richmond County (1% Asian), and Chesterfield County (0.5% Asian).

Marlboro County's Hispanic Population

708 residents of Marlboro County, or 2.7% of the population, identify as Hispanic. The share of Hispanic residents in Marlboro County is slightly lower than in South Carolina overall, where 7.4% of the population is Hispanic. Marlboro County ranks 39th statewide in terms of Hispanic residents as a share of the population, out of 46 counties.

Since the 2020 Census, Marlboro County's Hispanic population has grown by an estimated 23.1%. Hispanic residents' share of Marlboro County's population has increased from 2.2% to 2.7%.

Marlboro County is more Hispanic than neighboring Darlington County (2.5% Hispanic). Marlboro County is less Hispanic than neighboring Scotland County (4% Hispanic), Dillon County (3.5% Hispanic), Richmond County (7.8% Hispanic), and Chesterfield County (5.9% Hispanic).

Marlboro County's Native American/Other Population

950 residents of Marlboro County, or 3.7% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Marlboro County is slightly higher than in South Carolina overall, where 0.7% of the population is Native American/Other. Marlboro County ranks 1st statewide in terms of Native American/Other residents as a share of the population, out of 46 counties.

Since the 2020 Census, Marlboro County's Native American/Other population has declined by an estimated 19.2%. Native American/Other residents' share of Marlboro County's population has decreased from 4.4% to 3.7%.

Marlboro County is more Native American/Other than neighboring Dillon County (2% Native American/Other), Darlington County (0.4% Native American/Other), Richmond County (2.5% Native American/Other), and Chesterfield County (0.5% Native American/Other). Marlboro County is less Native American/Other than neighboring Scotland County (12.5% Native American/Other).

Marlboro County's Multiracial Population

1,876 residents of Marlboro County, or 7.2% of the population, identify as Multiracial. The share of Multiracial residents in Marlboro County is slightly higher than in South Carolina overall, where 3.7% of the population is Multiracial. Marlboro County ranks 17th statewide in terms of Multiracial residents as a share of the population, out of 46 counties.

Since the 2020 Census, Marlboro County's Multiracial population has grown by an estimated 95.6%. Multiracial residents' share of Marlboro County's population has increased from 3.6% to 7.2%.

Marlboro County is more Multiracial than neighboring Scotland County (5.2% Multiracial), Dillon County (4.7% Multiracial), Darlington County (2.8% Multiracial), Richmond County (2.8% Multiracial), and Chesterfield County (4.7% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.