Data / Rankings / Population under 18 / Counties in South Carolina

Counties in South Carolina by population under 18, 2025

Dillon County had the highest population under 18 of 46 counties in 2025, at 24.4%. McCormick County had the lowest, at 10%. The median was 20.9% and the figure for South Carolina was 20.6%. Source: the U.S. Census Bureau.

Highest24.4Dillon County
Lowest10McCormick County
Median20.946 counties
South Carolina20.6History

All counties, 2025

Dillon County: 24.4 %Dillon County24.4Dorchester County: 23.5 %Dorchester County23.5Barnwell County: 23.2 %Barnwell County23.2York County: 23.1 %York County23.1Berkeley County: 22.9 %Berkeley County22.9Spartanburg County: 22.9 %Spartanburg County22.9Kershaw County: 22.8 %Kershaw County22.8Florence County: 22.6 %Florence County22.6Sumter County: 22.5 %Sumter County22.5Chesterfield County: 22.4 %Chesterfield County22.4Lexington County: 22.3 %Lexington County22.3Darlington County: 22.2 %Darlington County22.2Lancaster County: 22.1 %Lancaster County22.1Cherokee County: 22.1 %Cherokee County22.1Greenville County: 22 %Greenville County22Saluda County: 21.8 %Saluda County21.8Anderson County: 21.7 %Anderson County21.7Colleton County: 21.5 %Colleton County21.5Aiken County: 21.3 %Aiken County21.3Chester County: 21.1 %Chester County21.1Marion County: 21.1 %Marion County21.1Laurens County: 21.1 %Laurens County21.1Greenwood County: 21 %Greenwood County21Hampton County: 20.8 %Hampton County20.8Newberry County: 20.7 %Newberry County20.7Orangeburg County: 20.3 %Orangeburg County20.3Union County: 20 %Union County20Richland County: 19.6 %Richland County19.6Abbeville County: 19.4 %Abbeville County19.4Marlboro County: 19.2 %Marlboro County19.2Charleston County: 18.7 %Charleston County18.7Bamberg County: 18.6 %Bamberg County18.6Calhoun County: 18.3 %Calhoun County18.3Clarendon County: 18 %Clarendon County18Pickens County: 18 %Pickens County18Oconee County: 18 %Oconee County18Williamsburg County: 18 %Williamsburg County18Lee County: 17.9 %Lee County17.9Edgefield County: 17.3 %Edgefield County17.3Jasper County: 17.2 %Jasper County17.2Fairfield County: 16.9 %Fairfield County16.9Horry County: 16.1 %Horry County16.1Allendale County: 16 %Allendale County16Beaufort County: 15.9 %Beaufort County15.9Georgetown County: 15.8 %Georgetown County15.8McCormick County: 10 %McCormick County10
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2025 (%)Change on 2024
1Dillon County24.4-0.1 pts
2Dorchester County23.5-0.4 pts
3Barnwell County23.2+0.2 pts
4York County23.1-0.2 pts
5Berkeley County22.9-0.4 pts
6Spartanburg County22.9-0.2 pts
7Kershaw County22.8-0.2 pts
8Florence County22.6-0.3 pts
9Sumter County22.5-0.2 pts
10Chesterfield County22.40 pts
11Lexington County22.3-0.4 pts
12Darlington County22.2-0.2 pts
13Lancaster County22.1-0 pts
14Cherokee County22.1-0.3 pts
15Greenville County22-0.4 pts
16Saluda County21.8-0.4 pts
17Anderson County21.7-0.3 pts
18Colleton County21.5-0.3 pts
19Aiken County21.30 pts
20Chester County21.1-0.2 pts
21Marion County21.1-0.3 pts
22Laurens County21.1-0.3 pts
23Greenwood County21-0.4 pts
24Hampton County20.80 pts
25Newberry County20.7-0.4 pts
26Orangeburg County20.3-0.4 pts
27Union County20-0.5 pts
28Richland County19.6-0.4 pts
29Abbeville County19.4-0.2 pts
30Marlboro County19.2+0.1 pts
31Charleston County18.7-0.3 pts
32Bamberg County18.6-0 pts
33Calhoun County18.3-0.1 pts
34Clarendon County18-0.3 pts
35Pickens County18-0.1 pts
36Oconee County18-0.3 pts
37Williamsburg County18-0.4 pts
38Lee County17.9-0.1 pts
39Edgefield County17.30 pts
40Jasper County17.2-0.5 pts
41Fairfield County16.9-0.1 pts
42Horry County16.1-0.3 pts
43Allendale County16-0 pts
44Beaufort County15.9-0.6 pts
45Georgetown County15.8-0.3 pts
46McCormick County100 pts

Other periods

About this ranking

Residents aged 0 to 17 as a percentage of total population on 1 July. United States: Census Bureau county population estimates by age; states and the nation are sums of their counties.

Uses the US age of majority. Not comparable with population_0_14_share, which stops at 14.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties (Counties in South Carolina by population under 18, 2025) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in South Carolina by population under 18, 2025. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-under-18/south-carolina-counties. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Counties in South Carolina by population under 18, 2025. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/population-under-18/south-carolina-counties.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in South Carolina by population under 18, 2025 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/south-carolina-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_carolina_2025,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in South Carolina by population under 18, 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/population-under-18/south-carolina-counties. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in South Carolina by population under 18, 2025
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/population-under-18/south-carolina-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/south-carolina-counties.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest population under 18?

Dillon County, with 24.4% in 2025, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

McCormick County, with 10% in 2025.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex: residents aged 0 to 17 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Retrieved 2026-10-12.

Population under 18: other rankings

Counties in South Carolina: more rankings