Area Code 219-256 located in EAST CHICAGO, LAKE, IN, more detail is as below. Place NPA (Numbering Plan Area) : 219 NXX (Local Number Prefix) : 256 City : EAST CHICAGO County : LAKE State : IN (Indiana) NXX Use Type : Wireless NXX Intro Version : 2/20/2007 FIPS (Federal Information Processing Standards) : 18089 LATA (Local Access Transport Area) : 358 Rate Center : E CHICAGO ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 46312 Other Information NPANXX : 219256 County Population : 0 Switch CLLI (Common Language Location Identifier) : CHCGILMFCM1 MSA CBSA (Core Based Statistical Area) : Chicago-Naperville-Joliet, IL-IN-WI MSA CBSA Code (Core Based Statistical Area) : 16980 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : T-MOBILE USA, INC. OCN (Operating Company Number) : 6529 Coverage Area Name : EAST CHICAGO Latitude : 41.6308 Longitude : -87.4626 ‹ previous : 219-254 next › : 219-261 Telephone Number List 219-256-0000 ~ 219-256-9999