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RANKING · 2020 CENSUS · 58 SHOWN OF 58

Youngest by median age, California counties · 2020

California counties with the youngest median age (2023 ACS). This list covers the 58 counties in California that qualify, ranked against each other statewide.

Flip the list · Oldest by median age, US counties
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SAME RANKING BYCitiesStatesMetrosZIP codes
RELATEDOldest by median ageMost foreign-born residentsHighest uninsured rateMost womenMost menHighest disability rate
YEAR19902000201020202024
Youngest by median age by state
RANKPLACESTATEPOPMEDIAN AGEVS 2000
01Merced County, CACA297,26032.0+10%
02Tulare County, CACA485,14632.3+11%
03Kern County, CACA927,06832.8+7%
04Kings County, CACA154,32732.9+9%
05Fresno County, CACA1,035,45633.3+11%
06Yolo County, CACA224,41033.3+13%
07Yuba County, CACA88,69134.3+9%
08Imperial County, CACA181,41134.6+12%
09San Bernardino County, CACA2,224,09134.9+15%
10Madera County, CACA167,92735.0+7%
11Monterey County, CACA433,72935.0+10%
12San Joaquin County, CACA823,81535.4+11%
13Colusa County, CACA21,83635.5+13%
14Stanislaus County, CACA557,71935.5+12%
15Santa Barbara County, CACA442,06535.7+7%
16San Benito County, CACA70,08236.6+17%
17Riverside County, CACA2,544,91636.8+11%
18Sacramento County, CACA1,618,46036.9+9%
19Sutter County, CACA98,78736.9+8%
20San Diego County, CACA3,282,24837.1+12%
21Lassen County, CACA28,11737.2+8%
22Glenn County, CACA28,14137.5+11%
23Los Angeles County, CACA9,694,93437.5+17%
24Santa Clara County, CACA1,914,39137.5+10%
25Alameda County, CACA1,636,63037.7+9%
26Butte County, CACA209,21137.9+6%
27San Francisco County, CACA826,07938.2+5%
28Orange County, CACA3,149,50739.0+17%
29Solano County, CACA455,37639.0+15%
30Humboldt County, CACA131,64739.1+8%
31Mono County, CACA12,50539.5+10%
32Ventura County, CACA830,85139.5+15%
33San Mateo County, CACA743,56839.9+8%
34Contra Costa County, CACA1,170,07040.1+10%
35Del Norte County, CACA26,41040.2+10%
36Santa Cruz County, CACA258,85240.2+15%
37Tehama County, CACA64,66540.4+7%
38San Luis Obispo County, CACA282,36741.4+11%
39Placer County, CACA442,08142.4+12%
40Sonoma County, CACA486,44442.6+14%
41Shasta County, CACA181,64842.8+10%
42Napa County, CACA132,94942.9+12%
43Mendocino County, CACA88,12243.2+11%
44Inyo County, CACA18,15844.8+5%
45Lake County, CACA67,77245.0+5%
46El Dorado County, CACA192,32346.3+18%
47Marin County, CACA253,69446.5+13%
48Trinity County, CACA15,72047.6+7%
49Siskiyou County, CACA42,01348.5+13%
50Modoc County, CACA8,42648.7+17%
51Tuolumne County, CACA53,16048.9+14%
52Nevada County, CACA101,91149.7+15%
53Alpine County, CACA1,04350.1+27%
54Amador County, CACA41,87651.6+21%
55Calaveras County, CACA46,60551.6+16%
56Mariposa County, CACA16,91852.1+21%
57Plumas County, CACA18,58353.0+20%
58Sierra County, CACA3,09853.9+23%
SHOWING 1–58 OF 58
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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES