Area Code 423-378 located in MOUNT CARMEL, HAWKINS, TN, more detail is as below. Place NPA (Numbering Plan Area) : 423 NXX (Local Number Prefix) : 378 City : MOUNT CARMEL County : HAWKINS State : TN (Tennessee) NXX Use Type : Landline NXX Intro Version : 1996-01-10 FIPS (Federal Information Processing Standards) : 47073 LATA (Local Access Transport Area) : 956 Rate Center : KINGSPORT ZIP Code Count : 21 ZIP Code Frequency : 2 ZIP Code : 37645 Other Information NPANXX : 423378 County Population : 0 Switch CLLI (Common Language Location Identifier) : KGPTTNXADS0 MSA CBSA (Core Based Statistical Area) : Kingsport-Bristol-Bristol, TN-VA MSA CBSA Code (Core Based Statistical Area) : 28700 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN OCN (Operating Company Number) : 4510 Coverage Area Name : KINGSPORT Latitude : 36.5449 Longitude : -82.5604 ‹ previous : 423-378 next › : 423-378 Telephone Number List 423-378-0000 ~ 423-378-9999