Area Code 240-497 located in BETHESDA, MONTGOMERY, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 497 City : BETHESDA County : MONTGOMERY State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 2000-10-31 FIPS (Federal Information Processing Standards) : 24031 LATA (Local Access Transport Area) : 236 Rate Center : WSHNGTNZN2 ZIP Code Count : 1 ZIP Code Frequency : 2 ZIP Code : 20816 Other Information NPANXX : 240497 County Population : 0 Switch CLLI (Common Language Location Identifier) : CHCHMDBEDS0 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 Overlay : L Company : VERIZON MARYLAND, INC. OCN (Operating Company Number) : 9212 Coverage Area Name : CHEVY CHASE Latitude : 38.9779 Longitude : -77.0919 ‹ previous : 240-497 next › : 240-497 Telephone Number List 240-497-0000 ~ 240-497-9999