Area Code 423-352 located in DUFF, CAMPBELL, TN, more detail is as below. Place NPA (Numbering Plan Area) : 423 NXX (Local Number Prefix) : 352 City : DUFF County : CAMPBELL State : TN (Tennessee) NXX Use Type : Landline NXX Intro Version : 1998-11-20 FIPS (Federal Information Processing Standards) : 47013 LATA (Local Access Transport Area) : 474 Rate Center : LAFOLLETTE ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 37729 Other Information NPANXX : 423352 County Population : 0 Switch CLLI (Common Language Location Identifier) : KNVLTN02DS1 MSA CBSA (Core Based Statistical Area) : La Follette, TN MSA CBSA Code (Core Based Statistical Area) : 29220 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : US LEC OF TENNESSEE, INC OCN (Operating Company Number) : 8356 Coverage Area Name : LA FOLLETTE Latitude : 36.3832 Longitude : -84.1177 ‹ previous : 423-352 next › : 423-353 Telephone Number List 423-352-0000 ~ 423-352-9999