341 Area Code: Oakland, California

Numbers carrying the 341 area code are recent additions to the East Bay's numbering, sharing footprint with the long-established 510 code that has served the region since the early 1990s. Oakland anchors the directory's records here. The city stretches from the working waterfront and container terminals along the Bay through the dense flatlands and into the wooded hills that climb toward the ridge dividing East Bay from Contra Costa County. The 341 designation, part of the North American Numbering Plan, is being filled gradually as Bay Area numbering demand pushes new allocations into the region.

A range of other California cities — Anaheim, Bakersfield, Chico, Concord, and many more — appear in the directory's records linked to 341 numbers. None of those are inside the 341 footprint. The recurrence pattern is shaped by the way phone numbers move across California through porting and prior registration, and by the routine cross-referencing that takes place in public-record sources. As an overlay still being populated, 341 has only a limited prefix presence in the directory at this stage — 3 distinct prefixes documented in detail, a small subset that should not be read as the underlying allocation total.

Oakland's median household income runs well above the US figure, reflecting the broader Bay Area wage profile, and home values come in roughly three times the national median. The median age sits a touch under the country's, and the city's population is in the mid-hundreds of thousands — large enough to function as a co-equal in the East Bay rather than as a satellite of San Francisco.