Area Code 423-258 located in MORRISTOWN, HAMBLEN, TN, more detail is as below. Place NPA (Numbering Plan Area) : 423 NXX (Local Number Prefix) : 258 City : MORRISTOWN County : HAMBLEN State : TN (Tennessee) NXX Use Type : Wireless NXX Intro Version : 2001-03-03 FIPS (Federal Information Processing Standards) : 47063 LATA (Local Access Transport Area) : 474 Rate Center : MORRISTOWN ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 37813 Other Information NPANXX : 423258 County Population : 0 Switch CLLI (Common Language Location Identifier) : KNVLTNJHCM1 MSA CBSA (Core Based Statistical Area) : Morristown, TN MSA CBSA Code (Core Based Statistical Area) : 34100 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : NEW CINGULAR WIRELESS PCS, LLC - GA OCN (Operating Company Number) : 6214 Coverage Area Name : MORRISTOWN Latitude : 36.2174 Longitude : -83.3034 ‹ previous : 423-257 next › : 423-259 Telephone Number List 423-258-0000 ~ 423-258-9999