Area Code 301-391 located in DAMASCUS, MONTGOMERY, MD, more detail is as below. Place NPA (Numbering Plan Area) : 301 NXX (Local Number Prefix) : 391 City : DAMASCUS County : MONTGOMERY State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 1995-02-11 FIPS (Federal Information Processing Standards) : 24031 LATA (Local Access Transport Area) : 236 Rate Center : DAMASCS236 ZIP Code Count : 129 ZIP Code Frequency : 57 ZIP Code : 20872 Other Information NPANXX : 301391 County Population : 0 Switch CLLI (Common Language Location Identifier) : DMSCMDDEDS0 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 : VERIZON MARYLAND, INC. OCN (Operating Company Number) : 9212 Coverage Area Name : DAMASCUS Latitude : 39.2904 Longitude : -77.2083 ‹ previous : 301-391 next › : 301-392 Telephone Number List 301-391-0000 ~ 301-391-9999