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California Counties by Uninsured Rate

The uninsured rate is the share of the population with no health insurance coverage — influenced heavily by Medicaid eligibility and employer coverage.

All 58 counties ranked by Uninsured Rate, from lowest to highest. Click the column header to reverse sort order. Data from the U.S. Census Bureau, ACS 5-Year Estimates, 2023.

States Counties Cities Metros ZIPs
# Counties Uninsured Rate
1 Orange County, California 0.0%
2 Plumas County, California 0.0%
3 Placer County, California 0.0%
4 Nevada County, California 0.6%
5 Alameda County, California 0.9%
6 Tulare County, California 1.1%
7 Shasta County, California 1.1%
8 Contra Costa County, California 1.2%
9 Tuolumne County, California 1.5%
10 Humboldt County, California 1.5%
11 Glenn County, California 1.7%
12 Los Angeles County, California 1.9%
13 San Benito County, California 2.0%
14 San Diego County, California 2.1%
15 Lake County, California 2.1%
16 San Bernardino County, California 2.2%
17 Mariposa County, California 2.6%
18 Inyo County, California 2.6%
19 Fresno County, California 2.6%
20 Kings County, California 2.6%
21 Solano County, California 2.7%
22 Sierra County, California 2.8%
23 Riverside County, California 3.1%
24 San Francisco County, California 3.5%
25 Lassen County, California 3.5%
26 Santa Clara County, California 3.8%
27 Marin County, California 3.8%
28 El Dorado County, California 4.0%
29 Ventura County, California 4.6%
30 Siskiyou County, California 4.6%
31 Yolo County, California 4.6%
32 San Mateo County, California 4.8%
33 Madera County, California 4.8%
34 Alpine County, California 5.0%
35 Kern County, California 5.1%
36 Calaveras County, California 5.3%
37 Santa Cruz County, California 5.3%
38 Sonoma County, California 5.4%
39 Napa County, California 5.7%
40 Monterey County, California 5.7%
41 San Luis Obispo County, California 5.8%
42 Amador County, California 5.9%
43 Del Norte County, California 5.9%
44 Stanislaus County, California 6.0%
45 Sutter County, California 6.0%
46 Sacramento County, California 6.3%
47 Tehama County, California 6.3%
48 San Joaquin County, California 6.4%
49 Butte County, California 6.4%
50 Imperial County, California 6.8%
51 Yuba County, California 6.9%
52 Mono County, California 7.1%
53 Mendocino County, California 8.2%
54 Colusa County, California 9.0%
55 Merced County, California 9.0%
56 Santa Barbara County, California 9.2%
57 Modoc County, California 9.8%
58 Trinity County, California 11.3%