Counties in California by child poverty rate, under 18 (US official measure)
Modoc County had the highest child poverty rate, under 18 (US official measure) of 58 counties in 2021, at 29.8%. San Mateo County had the lowest, at 6.5%. The median was 17% and the figure for California was 15.8%. Source: the U.S. Census Bureau.
Map of counties, 2021
- Under 11
- 11 to 14
- 14 to 17
- 17 to 21
- 21 to 24
- 24 and over
All counties, 2021
Full ranking
Other periods
About this ranking
People under 18 in families or living alone with income below the official US poverty thresholds, as a percentage of people under 18 whose poverty status can be determined. United States: Census Bureau Small Area Income and Poverty Estimates (SAIPE) for the nation, states and counties.
A model-based single-year estimate; the national figure is the one-year American Community Survey estimate. The Census Bureau advises comparing years from 2006 on only. Absolute thresholds set by the US government, so not comparable with the EU at_risk_of_poverty_rate. The rate for all ages is poverty_rate.
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. Small Area Income and Poverty Estimates (SAIPE): percent of people under age 18 in poverty, nation, states and counties. https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt. Retrieved 2026-10-12.Citation styles
APA 7
U.S. Census Bureau. (2026). Small Area Income and Poverty Estimates (SAIPE): percent of people under age 18 in poverty, nation, states and counties (Counties in California by child poverty rate, under 18 (US official measure), 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt
MLA 9
Small Area Income and Poverty Estimates (SAIPE): percent of people under age 18 in poverty, nation, states and counties, Counties in California by child poverty rate, under 18 (US official measure), 2021. U.S. Census Bureau, 27 Jan. 2026, https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt. Invokely, https://invokely.ai/rankings/child-poverty-rate-under-18/california-counties?period=2021. Accessed 12 Oct. 2026.
Chicago (author-date)
U.S. Census Bureau. 2026. Small Area Income and Poverty Estimates (SAIPE): percent of people under age 18 in poverty, nation, states and counties. Counties in California by child poverty rate, under 18 (US official measure), 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt. Also distributed by Invokely, https://invokely.ai/rankings/child-poverty-rate-under-18/california-counties?period=2021.
Harvard
U.S. Census Bureau (2026) Small Area Income and Poverty Estimates (SAIPE): percent of people under age 18 in poverty, nation, states and counties, Counties in California by child poverty rate, under 18 (US official measure), 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt, via Invokely: https://invokely.ai/rankings/child-poverty-rate-under-18/california-counties?period=2021 (Accessed: 12 October 2026).
BibTeX
@misc{census_counties_in_california_by_2021,
author = {{U.S. Census Bureau}},
title = {{Small Area Income and Poverty Estimates (SAIPE): percent of people under age 18 in poverty, nation, states and counties: Counties in California by child poverty rate, under 18 (US official measure), 2021}},
year = {2026},
howpublished = {Data set},
url = {https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt},
urldate = {2026-10-12},
note = {Accessed via Invokely, https://invokely.ai/rankings/child-poverty-rate-under-18/california-counties?period=2021. Publisher attribution: U.S. Census Bureau. Small Area Income and Poverty Estimates (SAIPE): percent of people under age 18 in poverty, nation, states and counties. https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt. Retrieved 2026-10-12.},
}
RIS
TY - DATA
AU - U.S. Census Bureau
TI - Small Area Income and Poverty Estimates (SAIPE): percent of people under age 18 in poverty, nation, states and counties: Counties in California by child poverty rate, under 18 (US official measure), 2021
PY - 2026
DA - 2026/01/27
PB - U.S. Census Bureau
DB - Invokely
UR - https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt
L2 - https://invokely.ai/rankings/child-poverty-rate-under-18/california-counties?period=2021
Y2 - 2026/10/12
N1 - Accessed via Invokely, https://invokely.ai/rankings/child-poverty-rate-under-18/california-counties?period=2021.
N1 - Publisher attribution: U.S. Census Bureau. Small Area Income and Poverty Estimates (SAIPE): percent of people under age 18 in poverty, nation, states and counties. https://www2.census.gov/programs-surveys/saipe/datasets/2021/2021-state-and-county/est21all.txt. Retrieved 2026-10-12.
ER -
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 California by child poverty rate, under 18 (US official measure) using official data, and cite the source.
rank_places {"indicator":"child_poverty_rate","level":"province","within":"California","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=child_poverty_rate&level=province&within=California&limit=10Questions
Which county has the highest child poverty rate, under 18 (US official measure)?
Modoc County, with 29.8% in 2021, according to the U.S. Census Bureau.
Which county has the lowest child poverty rate, under 18 (US official measure)?
San Mateo County, with 6.5% 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, Small Area Income and Poverty Estimates (SAIPE): percent of people under age 18 in poverty, nation, states and counties. Retrieved 2026-10-12.