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Thursday, August 6, 2026

Castro Valley vs South San Francisco

Castro Valley, CA compared with South San Francisco, CA · 18 miles apart

Castro Valley has 65,001 residents to South San Francisco’s 64,941. Castro Valley comes out ahead on median household income, median rent, homeownership. South San Francisco does better on average commute, unemployment.

Castro Valley, CA South San Francisco, CA
Population 65,001 64,941
Density (per sq mi) 3,858 7,056
Median household income $142,779 $136,578
Median home value $1,104,600 $1,188,800
Median rent $2,554 $2,802
Homeownership 72.5% 59%
Average commute 32.7 min 25.6 min
Median age 42.9 43.2
Bachelor's degree + 44.5% 40.8%
Poverty rate 6.7% 6.7%
Unemployment 3.8% 2.8%
Price to income 7.7× 8.7×

Highlighted where one city is clearly better on that measure. Population, density, home value and median age carry no highlight — a higher number there is good or bad depending on what you want.

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