California’s economic scoreboard just got a dramatic update, and the Bay Area is grabbing the spotlight. Federal and local data show that 16 California counties have seen their economies at least triple in size since 2001, with the biggest percentage leaps clustered around the Bay. The state’s overall economy remains enormous, roughly $4 trillion in 2024, yet those statewide headline numbers hide a sharp divide between tech-fueled growth and small county percentage spikes. The latest figures highlight how concentrated industries have reshaped local tax bases, housing markets and labor markets across the state.
Federal statistics released this year provide the backbone for the county-level breakdown. According to the U.S. Bureau of Economic Analysis, BEA’s new county GDP tables for 2024 are the source data analysts used to compare long-term growth back to 2001. Those tables show wide variation in both absolute size and percent change, so percentage headlines can tell a very different story from the raw dollar totals.
A local analysis of the BEA tables by The San Diego Union-Tribune identified 16 California counties whose economies grew by at least 200% between 2001 and 2024. The Tribune’s spreadsheet flags San Mateo as the biggest percentage gainer, about 379%, with San Francisco up roughly 281% and Santa Clara up about 264%. In absolute terms, the paper’s numbers show Santa Clara’s 2024 GDP near $438 billion, San Francisco around $268 billion and San Mateo about $217 billion.
Where growth came from
Much of the Bay Area’s jump can be traced to high-value services clustered around tech, finance, and professional services. BEA reporting highlights professional, scientific, and technical services and information industries as leading contributors to recent state growth, which helps explain why counties with a heavy tech presence expanded faster than more diversified or agriculture-focused counties. That kind of industry concentration also leaves certain counties more exposed to swings in tech investment, corporate profits and equity market cycles.
Small counties, big percentages
Percentage gains can be misleading when a county starts from a very small base. The Union-Tribune’s spreadsheet shows rural places such as Modoc posting triple-digit percent increases, with Modoc up roughly 274%, yet its 2024 GDP still totaled only about $688 million. Those small base spikes underscore the gap between a flashy percent change and the real-world scale of an economy that funds local services and jobs…