Area Code 423-584 located in KNOXVILLE, KNOX, TN, more detail is as below. Place NPA (Numbering Plan Area) : 423 NXX (Local Number Prefix) : 584 City : KNOXVILLE County : KNOX State : TN (Tennessee) NXX Use Type : Wireless NXX Intro Version : 2001-03-03 FIPS (Federal Information Processing Standards) : 47093 LATA (Local Access Transport Area) : 472 Rate Center : CLEVELAND ZIP Code Count : 1 ZIP Code Frequency : 100 ZIP Code : 37912 Other Information NPANXX : 423584 County Population : 0 Switch CLLI (Common Language Location Identifier) : CHTGTNGZ0MD MSA CBSA (Core Based Statistical Area) : Knoxville, TN MSA CBSA Code (Core Based Statistical Area) : 28940 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 : CLEVELAND Latitude : 35.1579 Longitude : -84.8675 ‹ previous : 423-582 next › : 423-585 Telephone Number List 423-584-0000 ~ 423-584-9999