Area Code 304-475 located in WILLIAMSON, MINGO, WV, more detail is as below. Place NPA (Numbering Plan Area) : 304 NXX (Local Number Prefix) : 475 City : WILLIAMSON County : MINGO State : WV (West Virginia) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 54059 LATA (Local Access Transport Area) : 254 Rate Center : DELBARTON ZIP Code Count : 48 ZIP Code Frequency : 2 ZIP Code : 25661 Other Information NPANXX : 304475 County Population : 0 Switch CLLI (Common Language Location Identifier) : DLTNWVGRRS1 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : FRONTIER WEST VIRGINIA INC. OCN (Operating Company Number) : 9214 Coverage Area Name : DELBARTON Latitude : 37.7113 Longitude : -82.1847 ‹ previous : 304-475 next › : 304-475 Telephone Number List 304-475-0000 ~ 304-475-9999