Area Code 510-816 located in ALAMO, CONTRA COSTA, CA, more detail is as below. Place NPA (Numbering Plan Area) : 510 NXX (Local Number Prefix) : 816 City : ALAMO County : CONTRA COSTA State : CA (California) NXX Use Type : Wireless NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 06013 LATA (Local Access Transport Area) : 722 Rate Center : OKLD MN-PD ZIP Code Count : 1 ZIP Code Frequency : 50 ZIP Code : 94507 Other Information NPANXX : 510816 Switch CLLI (Common Language Location Identifier) : CNCRCADOCM5 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 : NEW CINGULAR WIRELESS PCS, LLC OCN (Operating Company Number) : 6010 Coverage Area Name : OAKLAND Latitude : 37.8062 Longitude : -122.2638 ‹ previous : 510-816 next › : 510-817 Telephone Number List 510-816-0000 ~ 510-816-9999