Area Code 341

Area code 341 covers Oakland and nearby cities including Fremont, Hayward, Berkeley in California, in the Pacific Time.

Is a call from 341 a scam? Who called me from 341?

Cities in area code 341

Oakland, Fremont, Hayward, Berkeley, Richmond, San Leandro, Alameda, Union City, Newark, Castro Valley, El Cerrito, San Lorenzo

Area codes by city

Carriers in area code 341

Area code 341 spans 107 prefixes, about 42% wireless. Top carriers: ONVOY, LLC - CA, NEW CINGULAR WIRELESS PCS, LLC, T-MOBILE USA, INC., CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA. Look up the carrier for a 341 number.

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Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of June 20, 2026. Refreshed monthly.