Area Code 240-235 located in BETHESDA, MONTGOMERY, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 235 City : BETHESDA County : MONTGOMERY State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 1999-10-13 FIPS (Federal Information Processing Standards) : 24031 LATA (Local Access Transport Area) : 236 Rate Center : WSHNGTNZN2 ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 20817 Other Information NPANXX : 240235 County Population : 0 Switch CLLI (Common Language Location Identifier) : CHCHMDBE6MD 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 : PAETEC COMMUNICATIONS, INC. - MD OCN (Operating Company Number) : 4716 Coverage Area Name : BETHESDA Latitude : 38.9858 Longitude : -77.1065 ‹ previous : 240-234 next › : 240-235 Telephone Number List 240-235-0000 ~ 240-235-9999