Rank County Percentage of Seniors
1 Sierra County, California 23.7%
2 Calaveras County, California 23.3%
3 Amador County, California 23.0%
4 Mariposa County, California 23.0%
5 Plumas County, California 22.9%
6 Trinity County, California 22.0%
7 Tuolumne County, California 22.0%
8 Nevada County, California 21.5%
9 Modoc County, California 21.2%
10 Siskiyou County, California 21.1%
11 Inyo County, California 19.9%
12 Lake County, California 19.1%
13 Marin County, California 18.2%
14 Shasta County, California 18.1%
15 Alpine County, California 17.4%
16 Mendocino County, California 17.2%
17 Tehama County, California 16.8%
18 Placer County, California 16.6%
19 El Dorado County, California 16.4%
20 San Luis Obispo County, California 16.2%
21 Butte County, California 16.2%
22 Napa County, California 16.0%
23 Sonoma County, California 15.2%
24 Del Norte County, California 14.4%
25 Humboldt County, California 14.2%
26 San Francisco County, California 14.0%
27 San Mateo County, California 14.0%
28 Glenn County, California 14.0%
29 Sutter County, California 13.4%
30 Contra Costa County, California 13.3%
31 Santa Barbara County, California 13.3%
32 Ventura County, California 12.6%
33 Solano County, California 12.4%
34 Riverside County, California 12.4%
35 Orange County, California 12.3%
36 Santa Cruz County, California 12.2%
37 Colusa County, California 12.2%
38 Madera County, California 12.2%
39 San Diego County, California 12.0%
40 Sacramento County, California 11.9%
41 Alameda County, California 11.8%
42 Santa Clara County, California 11.6%
43 Los Angeles County, California 11.5%
44 Stanislaus County, California 11.3%
45 Monterey County, California 11.2%
46 San Joaquin County, California 11.0%
47 Lassen County, California 11.0%
48 Imperial County, California 11.0%
49 Yuba County, California 10.7%
50 Mono County, California 10.7%
51 Yolo County, California 10.6%
52 Fresno County, California 10.6%
53 San Benito County, California 10.4%
54 Merced County, California 9.9%
55 Tulare County, California 9.9%
56 San Bernardino County, California 9.6%
57 Kern County, California 9.4%
58 Kings County, California 8.5%

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