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

Counties in South Carolina by population under 18

Dillon County had the highest population under 18 of 46 counties in 2024, at 24.5%. McCormick County had the lowest, at 10%. The median was 21.2% and the figure for South Carolina was 20.9%. Source: the U.S. Census Bureau.

Highest24.5Dillon County
Lowest10McCormick County
Median21.246 counties
South Carolina20.9History

All counties, 2024

Dillon County: 24.5 %Dillon County24.5Dorchester County: 23.9 %Dorchester County23.9Berkeley County: 23.3 %Berkeley County23.3York County: 23.3 %York County23.3Spartanburg County: 23.1 %Spartanburg County23.1Barnwell County: 23 %Barnwell County23Kershaw County: 23 %Kershaw County23Florence County: 22.9 %Florence County22.9Lexington County: 22.7 %Lexington County22.7Sumter County: 22.7 %Sumter County22.7Chesterfield County: 22.4 %Chesterfield County22.4Cherokee County: 22.4 %Cherokee County22.4Darlington County: 22.4 %Darlington County22.4Greenville County: 22.3 %Greenville County22.3Saluda County: 22.2 %Saluda County22.2Lancaster County: 22.1 %Lancaster County22.1Anderson County: 22 %Anderson County22Colleton County: 21.7 %Colleton County21.7Greenwood County: 21.4 %Greenwood County21.4Marion County: 21.4 %Marion County21.4Laurens County: 21.4 %Laurens County21.4Chester County: 21.3 %Chester County21.3Aiken County: 21.3 %Aiken County21.3Newberry County: 21.1 %Newberry County21.1Hampton County: 20.8 %Hampton County20.8Orangeburg County: 20.7 %Orangeburg County20.7Union County: 20.5 %Union County20.5Richland County: 20 %Richland County20Abbeville County: 19.7 %Abbeville County19.7Marlboro County: 19.1 %Marlboro County19.1Charleston County: 19 %Charleston County19Bamberg County: 18.6 %Bamberg County18.6Calhoun County: 18.4 %Calhoun County18.4Williamsburg County: 18.4 %Williamsburg County18.4Clarendon County: 18.3 %Clarendon County18.3Oconee County: 18.3 %Oconee County18.3Pickens County: 18.1 %Pickens County18.1Lee County: 18 %Lee County18Jasper County: 17.7 %Jasper County17.7Edgefield County: 17.2 %Edgefield County17.2Fairfield County: 17.1 %Fairfield County17.1Horry County: 16.5 %Horry County16.5Beaufort County: 16.4 %Beaufort County16.4Georgetown County: 16.2 %Georgetown County16.2Allendale County: 16.1 %Allendale County16.1McCormick County: 10 %McCormick County10
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Dillon County24.5-0.2 pts
2Dorchester County23.9-0.6 pts
3Berkeley County23.3-0.2 pts
4York County23.3-0.3 pts
5Spartanburg County23.1-0.2 pts
6Barnwell County23-0.1 pts
7Kershaw County23-0.2 pts
8Florence County22.9-0.3 pts
9Lexington County22.7-0.2 pts
10Sumter County22.7-0.2 pts
11Chesterfield County22.4-0 pts
12Cherokee County22.4-0.2 pts
12Darlington County22.40 pts
14Greenville County22.3-0.2 pts
15Saluda County22.2-0.2 pts
16Lancaster County22.10 pts
17Anderson County22-0.3 pts
18Colleton County21.7-0.1 pts
19Greenwood County21.4-0.3 pts
20Marion County21.4-0.1 pts
21Laurens County21.4-0.1 pts
22Chester County21.3-0.3 pts
23Aiken County21.3-0 pts
24Newberry County21.1-0.2 pts
25Hampton County20.8+0.1 pts
26Orangeburg County20.7-0.2 pts
27Union County20.5-0.4 pts
28Richland County20-0.4 pts
29Abbeville County19.7-0.2 pts
30Marlboro County19.1-0.3 pts
31Charleston County19-0.3 pts
32Bamberg County18.6-0.6 pts
33Calhoun County18.4-0.3 pts
34Williamsburg County18.4-0.4 pts
35Clarendon County18.3-0.2 pts
36Oconee County18.3-0.3 pts
37Pickens County18.10 pts
38Lee County18-0 pts
39Jasper County17.7-0.4 pts
40Edgefield County17.2+0.1 pts
41Fairfield County17.10 pts
42Horry County16.5-0.3 pts
43Beaufort County16.4-0.4 pts
44Georgetown County16.2-0.4 pts
45Allendale County16.1-0.2 pts
46McCormick County10-0.3 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, 2024) [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, 2024. 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?period=2024. 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, 2024. 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?period=2024.

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, 2024 [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?period=2024 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_carolina_2024,
  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, 2024}},
  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?period=2024. 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, 2024
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?period=2024
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/south-carolina-counties?period=2024.
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 24.5% in 2024, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

McCormick County, with 10% in 2024.

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