Median Age of Residents by Bay Area County
2024 U.S. Census ACS 1-year estimates, released 9/2025
48.2
45
43.4 43.7
41.5
41.1
40.5 40.5
39.5 39.7
40
38.3
34
35
30
25
Monterey Santa Clara
Alameda Solano Santa Cruz
San Francisco
Contra Costa
San Mateo
Sonoma Napa Marin
Derived from sources deemed reliable, but may contain errors and are subject to revision. All numbers should be considered approximate.
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