Area Code 240-800 located in BETHESDA, MONTGOMERY, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 800 City : BETHESDA County : MONTGOMERY State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 6/22/2012 FIPS (Federal Information Processing Standards) : 24031 LATA (Local Access Transport Area) : 236 Rate Center : WSHNGTNZN2 ZIP Code Count : 0 ZIP Code Frequency : 0 ZIP Code : 20814 Other Information NPANXX : 240800 County Population : 0 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 : CORE COMMUNICATIONS, INC. - MD OCN (Operating Company Number) : 2593 Coverage Area Name : CHEVY CHASE Latitude : 38.9779 Longitude : -77.0919 ‹ previous : 240-794 next › : 240-801 Telephone Number List 240-800-0000 ~ 240-800-9999