Area Code 423-257 located in LIMESTONE, WASHINGTON, TN, more detail is as below. Place NPA (Numbering Plan Area) : 423 NXX (Local Number Prefix) : 257 City : LIMESTONE County : WASHINGTON State : TN (Tennessee) NXX Use Type : Landline NXX Intro Version : 1996-01-10 FIPS (Federal Information Processing Standards) : 47179 LATA (Local Access Transport Area) : 956 Rate Center : LIMESTONE ZIP Code Count : 1238 ZIP Code Frequency : 39 ZIP Code : 37681 Other Information NPANXX : 423257 County Population : 0 Switch CLLI (Common Language Location Identifier) : LMSTTNXADS0 MSA CBSA (Core Based Statistical Area) : Johnson City, TN MSA CBSA Code (Core Based Statistical Area) : 27740 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 : LIMESTONE Latitude : 36.2256 Longitude : -82.6311 ‹ previous : 423-256 next › : 423-257 Telephone Number List 423-257-0000 ~ 423-257-9999