Counties in South Carolina by average household size

Bamberg County had the highest average household size of 46 counties in 2021, at 2.8 persons per household. McCormick County had the lowest, at 2.3 persons per household. The median was 2.5 persons per household and the figure for South Carolina was 2.5 persons per household. Source: the U.S. Census Bureau.

Highest2.8Bamberg County

Lowest2.3McCormick County

Median2.546 counties

South Carolina2.5History

Map of counties, 2021

Under 2.4
2.4 to 2.5
2.5 to 2.6
2.6 and over

persons per household, 2021. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

persons per household. Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2021 persons per household
1	Bamberg County	2.8
2	Dillon County	2.7
3	Dorchester County	2.7
3	Marion County	2.7
5	Hampton County	2.7
6	Berkeley County	2.6
6	Cherokee County	2.6
8	Marlboro County	2.6
9	Clarendon County	2.6
10	Florence County	2.6
10	Kershaw County	2.6
12	Saluda County	2.6
12	Spartanburg County	2.6
14	Edgefield County	2.6
14	Laurens County	2.6
16	York County	2.6
17	Orangeburg County	2.6
18	Anderson County	2.5
18	Chester County	2.5
18	Lancaster County	2.5
21	Horry County	2.5
21	Sumter County	2.5
23	Colleton County	2.5
24	Jasper County	2.5
25	Abbeville County	2.5
25	Chesterfield County	2.5
25	Lexington County	2.5
28	Pickens County	2.5
29	Barnwell County	2.5
29	Williamsburg County	2.5
31	Aiken County	2.5
31	Beaufort County	2.5
31	Darlington County	2.5
31	Greenville County	2.5
35	Greenwood County	2.4
36	Calhoun County	2.4
36	Georgetown County	2.4
36	Lee County	2.4
36	Newberry County	2.4
40	Richland County	2.4
40	Union County	2.4
42	Allendale County	2.4
43	Fairfield County	2.4
44	Oconee County	2.4
45	Charleston County	2.4
46	McCormick County	2.3

Other periods

2024
2023
2022
2021

About this ranking

Average number of persons per private household. EU countries: EU-SILC. United States: American Community Survey five-year estimate of people in households divided by occupied housing units, where the period shown is the last year of the five-year span.

Covers private households only; people living in institutions or other group quarters are excluded. EU-SILC figures refer to the survey year. The EU and US surveys differ, so their figures are not strictly comparable.

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. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat. 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). American Community Survey 5-year estimates, table B25010: average household size of occupied housing units (Counties in South Carolina by average household size, 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat

MLA 9

American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, Counties in South Carolina by average household size, 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat. Invokely, https://invokely.ai/rankings/average-household-size/south-carolina-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. Counties in South Carolina by average household size, 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat. Also distributed by Invokely, https://invokely.ai/rankings/average-household-size/south-carolina-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B25010: average household size of occupied housing units, Counties in South Carolina by average household size, 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat, via Invokely: https://invokely.ai/rankings/average-household-size/south-carolina-counties?period=2021 (Accessed: 12 October 2026).

BibTeX

@misc{census_counties_in_south_carolina_2021,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B25010: average household size of occupied housing units: Counties in South Carolina by average household size, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/average-household-size/south-carolina-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. https://www2.census.gov/programs-surveys/acs/summary\_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat. Retrieved 2026-10-12.},
}

RIS

TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B25010: average household size of occupied housing units: Counties in South Carolina by average household size, 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat
L2  - https://invokely.ai/rankings/average-household-size/south-carolina-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-household-size/south-carolina-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b25010.dat. Retrieved 2026-10-12.
ER  -

Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Embed code

<iframe src="https://invokely.ai/embed/rankings/average-household-size/south-carolina-counties?period=2021" width="760" height="500" title="Counties in South Carolina by average household size, 2021, chart from Invokely" loading="lazy" style="border:0;width:100%;max-width:760px" referrerpolicy="strict-origin-when-cross-origin"></iframe>

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in South Carolina by average household size using official data, and cite the source.

rank_places {"indicator":"average_household_size","level":"province","within":"South Carolina","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=average_household_size&level=province&within=South%20Carolina&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest average household size?

Bamberg County, with 2.8 persons per household in 2021, according to the U.S. Census Bureau.

Which county has the lowest average household size?

McCormick County, with 2.3 persons per household 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, American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. Retrieved 2026-10-12.