NOTE: Gray indicates insufficient data or a suppressed estimate.
The northwestern coastal areas, particularly in Marin County, exhibit the highest median ages in the metro, with several zip codes reaching above 55, while pockets near downtown Oakland and parts of San Jose dip below 25, likely reflecting areas with large student populations or younger immigrant communities. A broad band of moderate median ages (35–45) stretches through the East Bay suburbs from Richmond through Hayward and into Fremont, contrasting with the notably younger skew in central San Jose and scattered zip codes in the South Bay. The sharpest spatial contrasts appear within Oakland itself, where adjacent zip codes can differ by 15–20 years, suggesting significant demographic segmentation at a hyperlocal level.
Data: U.S. Census Bureau, 2023 ACS
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