Area code 341 is one of California's newest overlay codes, covering Alameda and Contra Costa counties in the East Bay directly across the water from San Francisco, including Oakland's port and downtown core, Berkeley (home to UC Berkeley), Fremont and Hayward as major suburban employment centers, the industrial city of Richmond, and the island city of Alameda. The East Bay was originally part of the 415 area code covering the whole Bay Area until regulators split off 510 on September 2, 1991; a further 1998 split created 925 for the inland area east of the Berkeley Hills, while Oakland and Berkeley stayed within 510. By the late 2010s 510 alone was running short of combinations, so rather than splitting the territory again, regulators introduced 341 as an all-services overlay covering the identical 510 footprint, with new numbers going into service on July 22, 2019 per California Public Utilities Commission filings; the shared 510/341 territory now requires mandatory 10-digit dialing for every local call, with international calls placed from a 341 number dialed as 011 plus country code plus number. The region observes Pacific Time (PST/PDT). Scam activity reported against 341 numbers includes government-impersonation calls, one-ring Wangiri callback scams, port and shipping scams that exploit Oakland's port activity with fake customs fees or delivery-hold notices, and neighbor spoofing copying a victim's own six-digit prefix; recipients should withhold personal or financial details and report suspicious calls to the FTC. A business can obtain a local 341 or 510 number through Softtop by searching California inventory, with porting of an existing number available in five to ten business days.