Area Code 301-222 located in BETHESDA, MONTGOMERY, MD, more detail is as below. Place NPA (Numbering Plan Area) : 301 NXX (Local Number Prefix) : 222 City : BETHESDA County : MONTGOMERY State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 1997-10-11 FIPS (Federal Information Processing Standards) : 24031 LATA (Local Access Transport Area) : 236 Rate Center : WSHNGTNZN2 ZIP Code Count : 1 ZIP Code Frequency : 33 ZIP Code : 20817 Other Information NPANXX : 301222 County Population : 0 Switch CLLI (Common Language Location Identifier) : HRNDVA13DS0 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 : CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD OCN (Operating Company Number) : 3910 Coverage Area Name : BETHESDA Latitude : 38.9858 Longitude : -77.1065 ‹ previous : 301-222 next › : 301-222 Telephone Number List 301-222-0000 ~ 301-222-9999