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 2023, at 24.8%. McCormick County had the lowest, at 10.2%. The median was 21.3% and the figure for South Carolina was 21.2%. Source: the U.S. Census Bureau.

Highest24.8Dillon County
Lowest10.2McCormick County
Median21.346 counties
South Carolina21.2History

All counties, 2023

Dillon County: 24.8 %Dillon County24.8Dorchester County: 24.5 %Dorchester County24.5York County: 23.6 %York County23.6Berkeley County: 23.6 %Berkeley County23.6Spartanburg County: 23.3 %Spartanburg County23.3Kershaw County: 23.2 %Kershaw County23.2Florence County: 23.2 %Florence County23.2Barnwell County: 23.1 %Barnwell County23.1Lexington County: 23 %Lexington County23Sumter County: 23 %Sumter County23Greenville County: 22.6 %Greenville County22.6Cherokee County: 22.5 %Cherokee County22.5Chesterfield County: 22.5 %Chesterfield County22.5Saluda County: 22.4 %Saluda County22.4Darlington County: 22.3 %Darlington County22.3Anderson County: 22.3 %Anderson County22.3Lancaster County: 22.1 %Lancaster County22.1Colleton County: 21.8 %Colleton County21.8Greenwood County: 21.8 %Greenwood County21.8Chester County: 21.7 %Chester County21.7Laurens County: 21.5 %Laurens County21.5Marion County: 21.5 %Marion County21.5Newberry County: 21.3 %Newberry County21.3Aiken County: 21.3 %Aiken County21.3Orangeburg County: 20.9 %Orangeburg County20.9Union County: 20.8 %Union County20.8Hampton County: 20.7 %Hampton County20.7Richland County: 20.4 %Richland County20.4Abbeville County: 19.9 %Abbeville County19.9Marlboro County: 19.3 %Marlboro County19.3Bamberg County: 19.3 %Bamberg County19.3Charleston County: 19.3 %Charleston County19.3Williamsburg County: 18.8 %Williamsburg County18.8Calhoun County: 18.7 %Calhoun County18.7Oconee County: 18.6 %Oconee County18.6Clarendon County: 18.6 %Clarendon County18.6Jasper County: 18.1 %Jasper County18.1Pickens County: 18.1 %Pickens County18.1Lee County: 18 %Lee County18Edgefield County: 17.2 %Edgefield County17.2Fairfield County: 17 %Fairfield County17Beaufort County: 16.8 %Beaufort County16.8Horry County: 16.8 %Horry County16.8Georgetown County: 16.6 %Georgetown County16.6Allendale County: 16.2 %Allendale County16.2McCormick County: 10.2 %McCormick County10.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Dillon County24.8-0.1 pts
2Dorchester County24.5-0.1 pts
3York County23.6-0.3 pts
4Berkeley County23.6-0.4 pts
5Spartanburg County23.3+0.1 pts
6Kershaw County23.20 pts
7Florence County23.2-0.1 pts
8Barnwell County23.1-0.2 pts
9Lexington County23-0.1 pts
10Sumter County23-0.1 pts
11Greenville County22.6-0.2 pts
12Cherokee County22.5-0.1 pts
13Chesterfield County22.50 pts
14Saluda County22.4+0.1 pts
15Darlington County22.3-0.2 pts
16Anderson County22.3-0.1 pts
17Lancaster County22.10 pts
18Colleton County21.80 pts
19Greenwood County21.8-0.2 pts
20Chester County21.7-0.4 pts
21Laurens County21.5-0.2 pts
22Marion County21.5-0.2 pts
23Newberry County21.3-0.1 pts
24Aiken County21.3-0.1 pts
25Orangeburg County20.9-0.2 pts
26Union County20.8-0.3 pts
27Hampton County20.7-0 pts
28Richland County20.4-0.4 pts
29Abbeville County19.90 pts
30Marlboro County19.3-0.2 pts
31Bamberg County19.3-0.2 pts
32Charleston County19.3-0.2 pts
33Williamsburg County18.8-0.3 pts
34Calhoun County18.7-0.1 pts
35Oconee County18.6-0.1 pts
36Clarendon County18.6-0.5 pts
37Jasper County18.1-0.5 pts
38Pickens County18.1-0.1 pts
39Lee County18+0.2 pts
40Edgefield County17.2-0.6 pts
41Fairfield County17-0.2 pts
42Beaufort County16.8-0.7 pts
43Horry County16.8-0.3 pts
44Georgetown County16.6-0.2 pts
45Allendale County16.2-0 pts
46McCormick County10.2-0.1 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, 2023) [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, 2023. 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=2023. 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, 2023. 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=2023.

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, 2023 [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=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_carolina_2023,
  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, 2023}},
  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=2023. 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, 2023
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=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/south-carolina-counties?period=2023.
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 24.8% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

McCormick County, with 10.2% in 2023.

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