Just in time for Tax Day, all of the big papers like the SacBee and the California Post are reporting on our fine county’s wealth. It turns out that according to SmartAsset, we are number four in the nation and number one in California. The methodology is always the devil in the details, so here is theirs:
To identify the wealthiest counties, we compared all U.S. counties across three metrics: investment income, property value, and median income.
We started the analysis by calculating the Investment Index for each county by evenly weighing the Ordinary Dividends, Qualified Dividends, and Net Capital Gains. From there we calculated the Median Home Value, and the Median Income for each county, and ranked them on all three metrics.
The SacBee reports
According to SmartAsset, San Mateo County was the richest county in California in 2025 with a wealth index of 68.36 out of 100. Part of the San Francisco Bay Area, San Mateo County offers a “mix of unbeatable weather, charming seaside views and technical resiliency, Built In San Francisco said, making it a popular location for established tech companies and startups.
About 17% of San Mateo County residents work in professional, scientific, technical or administrative jobs, according to the county’s employment data. County residents had a median income of $156,000, according to SmartAsset. That’s about $56,000 more than the statewide median household income of $99,122 a year, according to data from the U.S. Census Bureau.
There are a lot of reasons for the “top line” — wealth, but as usual at the Voice, we ask what about the denominator? In this case it’s the cost to live here. We know it’s high and for a lot of items, we know why. Since gas prices are top of mind at the moment, you should check out the absolute smack down the U.S. Oil and Gas Association is applying on X to our governor, Tom Steyer and Ro Khanna among others as they blame everyone but ourselves for $6-7.50 gas. It’s embarrassing (if you are them). As they say, “the fish rots from the head”.


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