Area Code 305-423 located in MIAMI, MIAMI-DADE, FL, more detail is as below. Place NPA (Numbering Plan Area) : 305 NXX (Local Number Prefix) : 423 City : MIAMI County : MIAMI-DADE State : FL (Florida) NXX Use Type : Landline NXX Intro Version : 1998-08-14 FIPS (Federal Information Processing Standards) : 12086 LATA (Local Access Transport Area) : 460 Rate Center : MIAMI ZIP Code Count : 1 ZIP Code Frequency : 4 ZIP Code : 33169 Other Information NPANXX : 305423 County Population : 0 Switch CLLI (Common Language Location Identifier) : MIANFLWKDS0 MSA CBSA (Core Based Statistical Area) : Miami-Fort Lauderdale-Pompano Beach, FL MSA CBSA Code (Core Based Statistical Area) : 33100 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : INTERMEDIA COMMUNICATIONS INC. - FL OCN (Operating Company Number) : 8664 Coverage Area Name : MIAMI Latitude : 25.7927 Longitude : -80.3381 ‹ previous : 305-423 next › : 305-423 Telephone Number List 305-423-0000 ~ 305-423-9999