Area Code 423-824 located in ERWIN, UNICOI, TN, more detail is as below. Place NPA (Numbering Plan Area) : 423 NXX (Local Number Prefix) : 824 City : ERWIN County : UNICOI State : TN (Tennessee) NXX Use Type : Landline NXX Intro Version : 2003-02-09 FIPS (Federal Information Processing Standards) : 47171 Rate Center : ERWIN ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 37650 Other Information NPANXX : 423824 County Population : 0 Switch CLLI (Common Language Location Identifier) : BUVLTNANDS1 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 : EAST TENNESSEE NETWORK, LLC - TN OCN (Operating Company Number) : 9721 Latitude : None Longitude : None ‹ previous : 423-823 next › : 423-825 Telephone Number List 423-824-0000 ~ 423-824-9999