Area Code 301-384 located in SILVER SPRING, MONTGOMERY, MD, more detail is as below. Place NPA (Numbering Plan Area) : 301 NXX (Local Number Prefix) : 384 City : SILVER SPRING County : MONTGOMERY State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 24031 LATA (Local Access Transport Area) : 236 Rate Center : WSNGTNZN12 ZIP Code Count : 2120 ZIP Code Frequency : 42 ZIP Code : 20904 Other Information NPANXX : 301384 County Population : 0 Switch CLLI (Common Language Location Identifier) : SLSPMDCVDS0 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 : SILVER SPRING Latitude : 39.0794 Longitude : -77.0013 ‹ previous : 301-383 next › : 301-384 Telephone Number List 301-384-0000 ~ 301-384-9999