Alum Rock, CA vs Foster City, CA

The cost of living difference between Alum Rock, CA and Foster City, CA is dramatic. Alum Rock is 36.9% cheaper than Foster City, a gap that translates to thousands of dollars per year in household expenses. Alum Rock has a cost index of 185 while Foster City sits at 293, making this one of the more striking comparisons on our site. Relocating between these cities would require a serious reassessment of budget and lifestyle expectations.

On the housing front, median rent in Alum Rock is $2,412/month compared to $3,501/month in Foster City — a 31% difference. Home values follow the same pattern: Alum Rock is more affordable at $880,000 median vs $1,774,500.

Median household income in Alum Rock is $111,976 compared to $193,633 in Foster City (-42.2%). While Foster City is more expensive, its higher salaries more than compensate — residents there may actually end up with more disposable income. Looking at affordability, residents of Alum Rock spend roughly 25.8% of their income on rent, more than the 21.7% in Foster City.