Counties in California by uninsured rate, under 65 (US model-based estimate)
Colusa County had the highest uninsured rate, under 65 (US model-based estimate) of 58 counties in 2020, at 13%. Marin County had the lowest, at 4.2%. The median was 7.8% and the figure for California was 8.2%. Source: the U.S. Census Bureau.
Map of counties, 2020
- Under 6.1
- 6.1 to 7.1
- 7.1 to 7.8
- 7.8 to 8.7
- 8.7 to 10
- 10 and over
All counties, 2020
Full ranking
Other periods
About this ranking
People under 65 without health insurance coverage of any kind, as a percentage of all people under 65. United States: Census Bureau Small Area Health Insurance Estimates (SAHIE) for states and counties, all races, both sexes and all income levels.
A model-based single-year estimate that combines the American Community Survey with administrative records and population estimates, so every county gets a figure. Covers states and counties only, because the SAHIE dataset files have no national row. The Census Bureau advises comparing years from 2008 on only; 2013 is the updated release. People 65 and over are left out because nearly all of them have Medicare.
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 Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip. Retrieved 2026-10-12.Citation styles
APA 7
U.S. Census Bureau. (2026). Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties (Counties in California by uninsured rate, under 65 (US model-based estimate), 2020) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip
MLA 9
Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties, Counties in California by uninsured rate, under 65 (US model-based estimate), 2020. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/california-counties?period=2020. Accessed 12 Oct. 2026.
Chicago (author-date)
U.S. Census Bureau. 2026. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. Counties in California by uninsured rate, under 65 (US model-based estimate), 2020. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/california-counties?period=2020.
Harvard
U.S. Census Bureau (2026) Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties, Counties in California by uninsured rate, under 65 (US model-based estimate), 2020 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-under-65/california-counties?period=2020 (Accessed: 12 October 2026).
BibTeX
@misc{census_counties_in_california_by_2020,
author = {{U.S. Census Bureau}},
title = {{Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties: Counties in California by uninsured rate, under 65 (US model-based estimate), 2020}},
year = {2026},
howpublished = {Data set},
url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip},
urldate = {2026-10-12},
note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/california-counties?period=2020. Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip. Retrieved 2026-10-12.},
}
RIS
TY - DATA
AU - U.S. Census Bureau
TI - Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties: Counties in California by uninsured rate, under 65 (US model-based estimate), 2020
PY - 2026
DA - 2026/08/06
PB - U.S. Census Bureau
DB - Invokely
UR - https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip
L2 - https://invokely.ai/rankings/uninsured-rate-under-65/california-counties?period=2020
Y2 - 2026/10/12
N1 - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/california-counties?period=2020.
N1 - Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip. 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 uninsured rate, under 65 (US model-based estimate) using official data, and cite the source.
rank_places {"indicator":"uninsured_rate_under_65","level":"province","within":"California","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=uninsured_rate_under_65&level=province&within=California&limit=10Questions
Which county has the highest uninsured rate, under 65 (US model-based estimate)?
Colusa County, with 13% in 2020, according to the U.S. Census Bureau.
Which county has the lowest uninsured rate, under 65 (US model-based estimate)?
Marin County, with 4.2% in 2020.
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 Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.
Uninsured rate, under 65 (US model-based estimate): other rankings
Counties in California: more rankings
- Uninsured rate, all ages (US)
- Adult cigarette smoking rate, local model estimate
- Uninsured rate, ages 19 to 34 (US, ACS)
- Physical inactivity in adults, local model estimate
- Foreign-born population share
- Net international migration rate, July to June
- Net domestic migration rate, July to June
- High school graduate or higher, population 25 and over