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)

Monterey County had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 58 counties in 2022, at 14.9%. Placer County had the lowest, at 4.4%. The median was 8.6% and the figure for California was 9.1%. Source: the U.S. Census Bureau.

Highest14.9Monterey County
Lowest4.4Placer County
Median8.658 counties
California9.1History

All counties, 2022

Monterey County: 14.9 %Monterey County14.9Mendocino County: 12.8 %Mendocino County12.8Madera County: 12.6 %Madera County12.6Colusa County: 12.3 %Colusa County12.3Tulare County: 12.3 %Tulare County12.3Mono County: 11.7 %Mono County11.7Santa Barbara County: 11.4 %Santa Barbara County11.4Glenn County: 11.3 %Glenn County11.3Imperial County: 11.3 %Imperial County11.3Los Angeles County: 11.3 %Los Angeles County11.3Merced County: 11.2 %Merced County11.2San Bernardino County: 10.9 %San Bernardino County10.9Sutter County: 10.8 %Sutter County10.8Ventura County: 10.4 %Ventura County10.4Riverside County: 10.3 %Riverside County10.3Del Norte County: 10 %Del Norte County10Kern County: 10 %Kern County10Siskiyou County: 10 %Siskiyou County10Fresno County: 9.9 %Fresno County9.9San Joaquin County: 9.7 %San Joaquin County9.7Modoc County: 9.6 %Modoc County9.6Kings County: 9.3 %Kings County9.3Butte County: 9.1 %Butte County9.1Lake County: 9.1 %Lake County9.1Tehama County: 9.1 %Tehama County9.1Inyo County: 9 %Inyo County9Shasta County: 9 %Shasta County9Stanislaus County: 8.9 %Stanislaus County8.9Orange County: 8.8 %Orange County8.8San Diego County: 8.4 %San Diego County8.4Yuba County: 8.4 %Yuba County8.4Napa County: 8.3 %Napa County8.3San Benito County: 8.3 %San Benito County8.3San Luis Obispo County: 8.3 %San Luis Obispo County8.3Humboldt County: 8.2 %Humboldt County8.2Calaveras County: 8 %Calaveras County8Mariposa County: 7.9 %Mariposa County7.9Sonoma County: 7.8 %Sonoma County7.8Santa Cruz County: 7.6 %Santa Cruz County7.6Sierra County: 7.5 %Sierra County7.5Alpine County: 7.3 %Alpine County7.3Nevada County: 7.3 %Nevada County7.3Lassen County: 7.2 %Lassen County7.2Trinity County: 7.2 %Trinity County7.2Plumas County: 7.1 %Plumas County7.1Amador County: 6.8 %Amador County6.8Solano County: 6.7 %Solano County6.7Tuolumne County: 6.7 %Tuolumne County6.7Yolo County: 6.6 %Yolo County6.6Sacramento County: 6.4 %Sacramento County6.4Contra Costa County: 6.3 %Contra Costa County6.3El Dorado County: 6.1 %El Dorado County6.1Marin County: 6.1 %Marin County6.1San Mateo County: 5.3 %San Mateo County5.3Alameda County: 5.2 %Alameda County5.2Santa Clara County: 4.8 %Santa Clara County4.8San Francisco County: 4.6 %San Francisco County4.6Placer County: 4.4 %Placer County4.4
%. 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

RankCounties2022 (%)Change on 2021
1Monterey County14.9-0.6 pts
2Mendocino County12.8+1.4 pts
3Madera County12.6-1.4 pts
4Colusa County12.3-1.8 pts
4Tulare County12.3-1.7 pts
6Mono County11.7-0.2 pts
7Santa Barbara County11.4-0.9 pts
8Glenn County11.3-3.4 pts
8Imperial County11.3+0.7 pts
8Los Angeles County11.3-1 pts
11Merced County11.2-1.3 pts
12San Bernardino County10.9-1 pts
13Sutter County10.80 pts
14Ventura County10.4-1.3 pts
15Riverside County10.3-1.3 pts
16Del Norte County10-0.4 pts
16Kern County10-1.6 pts
16Siskiyou County10+1 pts
19Fresno County9.90 pts
20San Joaquin County9.70 pts
21Modoc County9.6-0.9 pts
22Kings County9.3-0.4 pts
23Butte County9.1+0.1 pts
23Lake County9.1-1.1 pts
23Tehama County9.1-0.3 pts
26Inyo County9-0.3 pts
26Shasta County90 pts
28Stanislaus County8.9-2 pts
29Orange County8.8-0.6 pts
30San Diego County8.4-0.5 pts
30Yuba County8.4-0.7 pts
32Napa County8.3-0.6 pts
32San Benito County8.3-0.9 pts
32San Luis Obispo County8.3+0.6 pts
35Humboldt County8.2-0.6 pts
36Calaveras County8+0.2 pts
37Mariposa County7.9-0.6 pts
38Sonoma County7.8-1.2 pts
39Santa Cruz County7.6-1.4 pts
40Sierra County7.50 pts
41Alpine County7.3-1 pts
41Nevada County7.30 pts
43Lassen County7.2-0.1 pts
43Trinity County7.2-0.6 pts
45Plumas County7.1+0.2 pts
46Amador County6.8+0.3 pts
47Solano County6.7-0.1 pts
47Tuolumne County6.7-0.4 pts
49Yolo County6.6-1.1 pts
50Sacramento County6.4-0.9 pts
51Contra Costa County6.3+0.2 pts
52El Dorado County6.1+0.5 pts
52Marin County6.1+0.6 pts
54San Mateo County5.3-0.2 pts
55Alameda County5.2-0.6 pts
56Santa Clara County4.8-0.5 pts
57San Francisco County4.6-0.3 pts
58Placer County4.4-0.2 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-2022-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), 2022) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2022-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), 2022. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2022-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties?period=2022. 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), 2022. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2022-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties?period=2022.

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), 2022 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2022-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties?period=2022 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_california_by_2022,
  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), 2022}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2022-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties?period=2022. 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-2022-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), 2022
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-2022-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties?period=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/california-counties?period=2022.
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-2022-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)?

Monterey County, with 14.9% in 2022, according to the U.S. Census Bureau.

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

Placer County, with 4.4% in 2022.

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