Data / Rankings / Uninsured rate, ages 18 to 64 (US model-based estimate) / Counties in California

Counties in California by uninsured rate, ages 18 to 64 (US model-based estimate), 2024

Madera County had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 58 counties in 2024, at 12.2%. San Francisco County had the lowest, at 4.3%. The median was 7.4% and the figure for California was 8.3%. Source: the U.S. Census Bureau.

Highest12.2Madera County
Lowest4.3San Francisco County
Median7.458 counties
California8.3History

All counties, 2024

Madera County: 12.2 %Madera County12.2Monterey County: 11.3 %Monterey County11.3Tulare County: 11.3 %Tulare County11.3Colusa County: 11.2 %Colusa County11.2Merced County: 10.9 %Merced County10.9Kern County: 10.7 %Kern County10.7Santa Barbara County: 10.5 %Santa Barbara County10.5Imperial County: 10.2 %Imperial County10.2Mendocino County: 10.1 %Mendocino County10.1Kings County: 10 %Kings County10Los Angeles County: 10 %Los Angeles County10San Bernardino County: 10 %San Bernardino County10Glenn County: 9.7 %Glenn County9.7Riverside County: 9.7 %Riverside County9.7Sutter County: 9.7 %Sutter County9.7Fresno County: 9.3 %Fresno County9.3San Joaquin County: 9.3 %San Joaquin County9.3Mono County: 9 %Mono County9Lake County: 8.9 %Lake County8.9Tehama County: 8.7 %Tehama County8.7Ventura County: 8.4 %Ventura County8.4Stanislaus County: 8.3 %Stanislaus County8.3Napa County: 8 %Napa County8Orange County: 7.9 %Orange County7.9Modoc County: 7.7 %Modoc County7.7Siskiyou County: 7.7 %Siskiyou County7.7Mariposa County: 7.6 %Mariposa County7.6San Diego County: 7.5 %San Diego County7.5Del Norte County: 7.4 %Del Norte County7.4Yuba County: 7.4 %Yuba County7.4Butte County: 7.3 %Butte County7.3Shasta County: 7.2 %Shasta County7.2San Benito County: 7.1 %San Benito County7.1Santa Cruz County: 7.1 %Santa Cruz County7.1Sonoma County: 7.1 %Sonoma County7.1Humboldt County: 7 %Humboldt County7Lassen County: 7 %Lassen County7Inyo County: 6.9 %Inyo County6.9San Luis Obispo County: 6.7 %San Luis Obispo County6.7Nevada County: 6.6 %Nevada County6.6Sacramento County: 6.6 %Sacramento County6.6Sierra County: 6.5 %Sierra County6.5Calaveras County: 6.2 %Calaveras County6.2Solano County: 6.2 %Solano County6.2Yolo County: 6.2 %Yolo County6.2Trinity County: 6.1 %Trinity County6.1Amador County: 6 %Amador County6Contra Costa County: 6 %Contra Costa County6Plumas County: 5.9 %Plumas County5.9Marin County: 5.7 %Marin County5.7Tuolumne County: 5.7 %Tuolumne County5.7Alameda County: 5.3 %Alameda County5.3El Dorado County: 5.1 %El Dorado County5.1San Mateo County: 5.1 %San Mateo County5.1Santa Clara County: 5.1 %Santa Clara County5.1Alpine County: 4.6 %Alpine County4.6Placer County: 4.5 %Placer County4.5San Francisco County: 4.3 %San Francisco County4.3
%. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Full ranking

RankCounties2024 (%)Change on 2023
1Madera County12.2-1.7 pts
2Monterey County11.3-2.9 pts
2Tulare County11.3-1.4 pts
4Colusa County11.2+0.3 pts
5Merced County10.9-1.4 pts
6Kern County10.7-1.2 pts
7Santa Barbara County10.5-2 pts
8Imperial County10.2-1 pts
9Mendocino County10.10 pts
10Kings County10-1 pts
10Los Angeles County10-0.6 pts
10San Bernardino County10-0.9 pts
13Glenn County9.7-1.7 pts
13Riverside County9.7-1 pts
13Sutter County9.7-1 pts
16Fresno County9.3-1.3 pts
16San Joaquin County9.3+0.4 pts
18Mono County9-2.4 pts
19Lake County8.9-1.2 pts
20Tehama County8.7+0.1 pts
21Ventura County8.4-1.8 pts
22Stanislaus County8.3-0.4 pts
23Napa County8+0.2 pts
24Orange County7.9-0.4 pts
25Modoc County7.7-0.9 pts
25Siskiyou County7.7-0.3 pts
27Mariposa County7.6+0.2 pts
28San Diego County7.5-0.5 pts
29Del Norte County7.4-2 pts
29Yuba County7.4-1.4 pts
31Butte County7.3-0.6 pts
32Shasta County7.2-1.4 pts
33San Benito County7.1-0.9 pts
33Santa Cruz County7.1-0.7 pts
33Sonoma County7.1-0.6 pts
36Humboldt County7-1.4 pts
36Lassen County7-0.9 pts
38Inyo County6.9-0.3 pts
39San Luis Obispo County6.7-0.7 pts
40Nevada County6.6+0.2 pts
40Sacramento County6.6-0.7 pts
42Sierra County6.5-0.3 pts
43Calaveras County6.2-0.4 pts
43Solano County6.2-0.3 pts
43Yolo County6.2-1.2 pts
46Trinity County6.1-1 pts
47Amador County6-1.1 pts
47Contra Costa County6-1 pts
49Plumas County5.9-0.3 pts
50Marin County5.7+0.5 pts
50Tuolumne County5.7-1.4 pts
52Alameda County5.3-0.3 pts
53El Dorado County5.1-0.3 pts
53San Mateo County5.1-0.6 pts
53Santa Clara County5.1-0.4 pts
56Alpine County4.6-1.5 pts
57Placer County4.5-0.5 pts
58San Francisco County4.3-0.3 pts

Other periods

About this ranking

People aged 18 to 64 without health insurance coverage of any kind, as a percentage of all people aged 18 to 64. 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. Working-age adults; the rate for everyone under 65 is uninsured_rate_under_65.

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, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip. 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). Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties (Counties in California by uninsured rate, ages 18 to 64 (US model-based estimate), 2024) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip

MLA 9

Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties, Counties in California by uninsured rate, ages 18 to 64 (US model-based estimate), 2024. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Counties in California by uninsured rate, ages 18 to 64 (US model-based estimate), 2024. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties.

Harvard

U.S. Census Bureau (2026) Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties, Counties in California by uninsured rate, ages 18 to 64 (US model-based estimate), 2024 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_california_by_2024,
  author = {{U.S. Census Bureau}},
  title = {{Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties: Counties in California by uninsured rate, ages 18 to 64 (US model-based estimate), 2024}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties. Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties: Counties in California by uninsured rate, ages 18 to 64 (US model-based estimate), 2024
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-2024-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties.
N1  - Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest uninsured rate, ages 18 to 64 (US model-based estimate)?

Madera County, with 12.2% in 2024, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, ages 18 to 64 (US model-based estimate)?

San Francisco County, with 4.3% in 2024.

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, ages 18 to 64, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Uninsured rate, ages 18 to 64 (US model-based estimate): other rankings

Counties in California: more rankings