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 2021, at 24.9%. McCormick County had the lowest, at 10.7%. The median was 21.4% and the figure for South Carolina was 21.5%. Source: the U.S. Census Bureau.

Highest24.9Dillon County
Lowest10.7McCormick County
Median21.446 counties
South Carolina21.5History

All counties, 2021

Dillon County: 24.9 %Dillon County24.9Dorchester County: 24.7 %Dorchester County24.7York County: 24.2 %York County24.2Berkeley County: 24.1 %Berkeley County24.1Barnwell County: 23.3 %Barnwell County23.3Sumter County: 23.2 %Sumter County23.2Florence County: 23.2 %Florence County23.2Lexington County: 23.2 %Lexington County23.2Spartanburg County: 23.2 %Spartanburg County23.2Kershaw County: 23.1 %Kershaw County23.1Greenville County: 22.7 %Greenville County22.7Cherokee County: 22.6 %Cherokee County22.6Darlington County: 22.5 %Darlington County22.5Anderson County: 22.4 %Anderson County22.4Chesterfield County: 22.4 %Chesterfield County22.4Chester County: 22.2 %Chester County22.2Greenwood County: 22.1 %Greenwood County22.1Saluda County: 22.1 %Saluda County22.1Lancaster County: 22.1 %Lancaster County22.1Marion County: 21.9 %Marion County21.9Laurens County: 21.9 %Laurens County21.9Colleton County: 21.6 %Colleton County21.6Newberry County: 21.4 %Newberry County21.4Aiken County: 21.4 %Aiken County21.4Union County: 21.3 %Union County21.3Orangeburg County: 21.3 %Orangeburg County21.3Richland County: 21.2 %Richland County21.2Hampton County: 20.7 %Hampton County20.7Abbeville County: 20.1 %Abbeville County20.1Charleston County: 19.6 %Charleston County19.6Marlboro County: 19.5 %Marlboro County19.5Bamberg County: 19.4 %Bamberg County19.4Williamsburg County: 19.3 %Williamsburg County19.3Clarendon County: 19.3 %Clarendon County19.3Jasper County: 19.2 %Jasper County19.2Calhoun County: 19 %Calhoun County19Oconee County: 18.9 %Oconee County18.9Pickens County: 18.4 %Pickens County18.4Edgefield County: 18.3 %Edgefield County18.3Beaufort County: 18.2 %Beaufort County18.2Fairfield County: 17.6 %Fairfield County17.6Lee County: 17.5 %Lee County17.5Horry County: 17.3 %Horry County17.3Georgetown County: 17.2 %Georgetown County17.2Allendale County: 16.8 %Allendale County16.8McCormick County: 10.7 %McCormick County10.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Dillon County24.9+0.1 pts
2Dorchester County24.7-0.2 pts
3York County24.2-0.3 pts
4Berkeley County24.1-0.2 pts
5Barnwell County23.3+0.4 pts
6Sumter County23.2-0.1 pts
7Florence County23.20 pts
8Lexington County23.2-0.2 pts
9Spartanburg County23.2-0 pts
10Kershaw County23.1-0.1 pts
11Greenville County22.7-0.2 pts
12Cherokee County22.6-0 pts
13Darlington County22.5+0.2 pts
14Anderson County22.4-0.1 pts
15Chesterfield County22.40 pts
16Chester County22.2-0.1 pts
17Greenwood County22.1-0.2 pts
18Saluda County22.1+0.1 pts
19Lancaster County22.1-0.2 pts
20Marion County21.9-0.2 pts
21Laurens County21.9-0.1 pts
22Colleton County21.6-0.1 pts
23Newberry County21.4-0.2 pts
24Aiken County21.4-0.1 pts
25Union County21.3-0.1 pts
26Orangeburg County21.3-0.2 pts
27Richland County21.2-0.4 pts
28Hampton County20.7-0.2 pts
29Abbeville County20.1-0.1 pts
30Charleston County19.6-0.2 pts
31Marlboro County19.5+0.1 pts
32Bamberg County19.4-0.3 pts
33Williamsburg County19.3-0.4 pts
34Clarendon County19.3-0.7 pts
35Jasper County19.2-1 pts
36Calhoun County19-0.1 pts
37Oconee County18.9-0.3 pts
38Pickens County18.4-0.1 pts
39Edgefield County18.3-0.5 pts
40Beaufort County18.2-0.8 pts
41Fairfield County17.6-0.4 pts
42Lee County17.5-0.3 pts
43Horry County17.3-0.3 pts
44Georgetown County17.2-0.5 pts
45Allendale County16.8-0.5 pts
46McCormick County10.7-0.1 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, 2021) [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, 2021. 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=2021. 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, 2021. 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=2021.

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, 2021 [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=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_carolina_2021,
  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, 2021}},
  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=2021. 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, 2021
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=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/south-carolina-counties?period=2021.
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 24.9% in 2021, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

McCormick County, with 10.7% in 2021.

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