Area Code 301-300 located in BETHESDA, MONTGOMERY, MD, more detail is as below. Place NPA (Numbering Plan Area) : 301 NXX (Local Number Prefix) : 300 City : BETHESDA County : MONTGOMERY State : MD (Maryland) NXX Use Type : Wireless NXX Intro Version : 3/30/2007 FIPS (Federal Information Processing Standards) : 24031 LATA (Local Access Transport Area) : 236 Rate Center : WSHNGTNZN2 ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 20814 Other Information NPANXX : 301300 County Population : 0 Switch CLLI (Common Language Location Identifier) : ANJTMDAHCM2 MSA CBSA (Core Based Statistical Area) : Washington-Arlington-Alexandria, DC-VA-MD-WV MSA CBSA Code (Core Based Statistical Area) : 47900 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD OCN (Operating Company Number) : 6395 Coverage Area Name : BETHESDA Latitude : 38.9858 Longitude : -77.1065 ‹ previous : 301-299 next › : 301-302 Telephone Number List 301-300-0000 ~ 301-300-9999