Area Code 304-261 located in MARTINSBURG, BERKELEY, WV, more detail is as below. Place NPA (Numbering Plan Area) : 304 NXX (Local Number Prefix) : 261 City : MARTINSBURG County : BERKELEY State : WV (West Virginia) NXX Use Type : Wireless NXX Intro Version : 1995-07-04 FIPS (Federal Information Processing Standards) : 54003 LATA (Local Access Transport Area) : 240 Rate Center : MARTINSBG ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 25401 Other Information NPANXX : 304261 County Population : 0 Switch CLLI (Common Language Location Identifier) : HRNDVACXCM3 MSA CBSA (Core Based Statistical Area) : Hagerstown-Martinsburg, MD-WV MSA CBSA Code (Core Based Statistical Area) : 25180 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : NEW CINGULAR WIRELESS PCS, LLC - DC OCN (Operating Company Number) : 4036 Coverage Area Name : MARTINSBURG Latitude : 39.4590 Longitude : -77.9697 ‹ previous : 304-260 next › : 304-262 Telephone Number List 304-261-0000 ~ 304-261-9999