Area Code 423-270 located in ERWIN, UNICOI, TN, more detail is as below. Place NPA (Numbering Plan Area) : 423 NXX (Local Number Prefix) : 270 City : ERWIN County : UNICOI State : TN (Tennessee) NXX Use Type : Wireless NXX Intro Version : 4/24/2013 FIPS (Federal Information Processing Standards) : 47171 LATA (Local Access Transport Area) : 956 Rate Center : ERWIN ZIP Code Count : 0 ZIP Code Frequency : 0 ZIP Code : 37650 Other Information NPANXX : 423270 County Population : 0 MSA CBSA (Core Based Statistical Area) : Johnson City, TN MSA CBSA Code (Core Based Statistical Area) : 27740 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN OCN (Operating Company Number) : 6673 Coverage Area Name : ERWIN Latitude : None Longitude : None ‹ previous : 423-269 next › : 423-271 Telephone Number List 423-270-0000 ~ 423-270-9999