Area Code 310-999 located in LOS ANGELES, LOS ANGELES, CA, more detail is as below. Place NPA (Numbering Plan Area) : 310 NXX (Local Number Prefix) : 999 City : LOS ANGELES County : LOS ANGELES State : CA (California) NXX Use Type : Landline NXX Intro Version : 1998-11-20 FIPS (Federal Information Processing Standards) : 06037 LATA (Local Access Transport Area) : 730 Rate Center : CMTN GRDN ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 90037 Other Information NPANXX : 310999 County Population : 0 Switch CLLI (Common Language Location Identifier) : LSANCARC5KD MSA CBSA (Core Based Statistical Area) : Los Angeles-Long Beach-Santa Ana, CA MSA CBSA Code (Core Based Statistical Area) : 31100 Time Zone : Pacific (GMT -08:00) Observes Daylight Saving Time : Yes Company : PAC - WEST TELECOMM, INC. OCN (Operating Company Number) : 7379 Coverage Area Name : GREEN Latitude : 34.0462 Longitude : -118.2568 ‹ previous : 310-998 next › : 312-201 Telephone Number List 310-999-0000 ~ 310-999-9999