Area Code 214-257 located in DALLAS, DALLAS, TX, more detail is as below. Place NPA (Numbering Plan Area) : 214 NXX (Local Number Prefix) : 257 City : DALLAS County : DALLAS State : TX (Texas) NXX Use Type : Landline NXX Intro Version : 1997-10-11 FIPS (Federal Information Processing Standards) : 48113 LATA (Local Access Transport Area) : 552 Rate Center : DALLAS ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 75226 Other Information NPANXX : 214257 County Population : 0 Switch CLLI (Common Language Location Identifier) : IRNGTXXADS0 MSA CBSA (Core Based Statistical Area) : Dallas-Fort Worth-Arlington, TX MSA CBSA Code (Core Based Statistical Area) : 19100 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : AT&T LOCAL OCN (Operating Company Number) : 7421 Coverage Area Name : DALLAS Latitude : 32.7962 Longitude : -96.7812 ‹ previous : 214-256 next › : 214-257 Telephone Number List 214-257-0000 ~ 214-257-9999