Area Code 323-278 located in MONTEREY PARK, LOS ANGELES, CA, more detail is as below. Place NPA (Numbering Plan Area) : 323 NXX (Local Number Prefix) : 278 City : MONTEREY PARK County : LOS ANGELES State : CA (California) NXX Use Type : Landline NXX Intro Version : 1998-08-14 FIPS (Federal Information Processing Standards) : 06037 LATA (Local Access Transport Area) : 730 Rate Center : MONTEBELLO ZIP Code Count : 10 ZIP Code Frequency : 3 ZIP Code : 91754 Other Information NPANXX : 323278 County Population : 0 Switch CLLI (Common Language Location Identifier) : LSANCA35DS1 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 : PACIFIC BELL OCN (Operating Company Number) : 9740 Coverage Area Name : MONTEBELLO Latitude : 34.0163 Longitude : -118.1334 ‹ previous : 323-278 next › : 323-278 Telephone Number List 323-278-0000 ~ 323-278-9999