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Median Age in California, by County

Median Age for every county in California, ranked. The highest is Trinity County at 54.9 and the lowest is Merced County at 31.8.

California: 37.9 · United States: 38.9 · median county in California: 39.6

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#County Median Age
1Trinity County54.9
2Sierra County54.7
3Calaveras County52.0
4Plumas County52.0
5Mariposa County51.2
6Nevada County50.1
7Amador County49.7
8Tuolumne County48.4
9Modoc County47.5
10Marin County47.4
11Siskiyou County47.2
12El Dorado County46.1
13Inyo County45.5
14Lake County44.1
15Mendocino County44.1
16Napa County42.9
17Sonoma County42.9
18Placer County42.5
19Shasta County41.7
20Mono County41.5
21San Mateo County40.9
22Contra Costa County40.5
23San Luis Obispo County40.4
24San Francisco County40.0
25Tehama County40.0
26Del Norte County39.9
27Humboldt County39.9
28Alpine County39.8
29Santa Cruz County39.8
30Ventura County39.6
31Orange County39.4
32Solano County39.2
33Alameda County39.0
34Lassen County38.3
35Los Angeles County38.2
36Santa Clara County38.1
37Sacramento County37.5
38San Diego County37.3
39Riverside County37.0
40Sutter County36.5
41Butte County36.2
42Glenn County36.2
43San Benito County36.1
44Colusa County35.9
45Monterey County35.5
46San Joaquin County35.4
47Stanislaus County34.9
48San Bernardino County34.7
49Madera County34.6
50Santa Barbara County34.6
51Yuba County34.2
52Fresno County33.5
53Imperial County33.2
54Kern County32.7
55Kings County32.5
56Tulare County32.1
57Yolo County32.1
58Merced County31.8

Half of residents are older than this and half are younger.

Source: ACS 2020-2024 5-Year Estimates, 2024.

California ranks 41st of 52 states for median age.

Median Age in other states

Other statistics for California by county