Area Code 304-366 located in FAIRMONT, MARION, WV, more detail is as below. Place NPA (Numbering Plan Area) : 304 NXX (Local Number Prefix) : 366 City : FAIRMONT County : MARION State : WV (West Virginia) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 54049 LATA (Local Access Transport Area) : 256 Rate Center : FAIRMONT ZIP Code Count : 6923 ZIP Code Frequency : 94 ZIP Code : 26554 Other Information NPANXX : 304366 County Population : 0 Switch CLLI (Common Language Location Identifier) : FAMTWVMNDS0 MSA CBSA (Core Based Statistical Area) : Fairmont, WV MSA CBSA Code (Core Based Statistical Area) : 21900 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : FRONTIER WEST VIRGINIA INC. OCN (Operating Company Number) : 9214 Coverage Area Name : FAIRMONT Latitude : 39.4843 Longitude : -80.1409 ‹ previous : 304-366 next › : 304-367 Telephone Number List 304-366-0000 ~ 304-366-9999