Area Code 408-234 located in MENLO PARK, SAN MATEO, CA, more detail is as below. Place NPA (Numbering Plan Area) : 408 NXX (Local Number Prefix) : 234 City : MENLO PARK County : SAN MATEO State : CA (California) NXX Use Type : Wireless NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 06081 LATA (Local Access Transport Area) : 722 Rate Center : SNJS WEST ZIP Code Count : 1 ZIP Code Frequency : 17 ZIP Code : 94025 Other Information NPANXX : 408234 Switch CLLI (Common Language Location Identifier) : SNTCCACSCM2 MSA CBSA (Core Based Statistical Area) : San Francisco-Oakland-Fremont, CA MSA CBSA Code (Core Based Statistical Area) : 41860 Time Zone : Pacific (GMT -08:00) Observes Daylight Saving Time : Yes Company : CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA OCN (Operating Company Number) : 6006 Coverage Area Name : SAN JOSE Latitude : 37.3323 Longitude : -121.8893 ‹ previous : 408-234 next › : 408-235 Telephone Number List 408-234-0000 ~ 408-234-9999