Area Code 423-305 located in CHATTANOOGA, HAMILTON, TN, more detail is as below. Place NPA (Numbering Plan Area) : 423 NXX (Local Number Prefix) : 305 City : CHATTANOOGA County : HAMILTON State : TN (Tennessee) NXX Use Type : Landline NXX Intro Version : 2/23/2007 FIPS (Federal Information Processing Standards) : 47065 LATA (Local Access Transport Area) : 472 Rate Center : CHATTNOOGA ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 37403 Other Information NPANXX : 423305 County Population : 0 Switch CLLI (Common Language Location Identifier) : CHTGTNNSX1Y MSA CBSA (Core Based Statistical Area) : Chattanooga, TN-GA MSA CBSA Code (Core Based Statistical Area) : 16860 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : COMCAST PHONE OF TENNESSEE, LLC - TN OCN (Operating Company Number) : 408D Coverage Area Name : CHATTANOOGA Latitude : 35.0431 Longitude : -85.3048 ‹ previous : 423-304 next › : 423-306 Telephone Number List 423-305-0000 ~ 423-305-9999