510 Area Code: Oakland, California

California's East Bay is served by the 510 area code, with Oakland as its primary city and the largest population center inside the footprint. Oakland sits across the bay from San Francisco, organized along a long shoreline that includes one of the busiest container ports on the West Coast, with the city itself rising from the flatlands into the wooded hills above. The 510 designation has covered this region since the early 1990s, when it was split from the long-running 415 to manage growing number demand around the bay; the footprint extends through Berkeley, Alameda, Hayward, Fremont, and the Contra Costa cities along the bay's eastern edge.

A long list of California cities — Anaheim, Bakersfield, Chico, Concord, and many more — appears in the directory's records tied to 510 numbers. None of those sit inside the 510 footprint. Their appearance reflects how phones, addresses, and registrations move across California through porting and routine public-record cross-referencing. Our records document 682 distinct prefixes within 510, a working subset rather than a complete tally of the prefixes the code currently carries.

Oakland's home values come in roughly three times the US median, in line with the broader Bay Area pricing pattern, and median household income runs well above the national figure. The city's median age sits a touch under the US reading, and the population is in the mid-hundreds of thousands — substantial enough to anchor a major metropolitan economy and big enough to hold a distinct identity from San Francisco across the bay.