Area Code 240-365 located in MONROVIA, FREDERICK, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 365 City : MONROVIA County : FREDERICK State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 2000-08-20 FIPS (Federal Information Processing Standards) : 24021 LATA (Local Access Transport Area) : 236 Rate Center : DAMASCUS ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 21770 Other Information NPANXX : 240365 County Population : 0 Switch CLLI (Common Language Location Identifier) : LARLMDEH00T 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 : BALTIMORE-WASHINGTON TELEPHONE BWT OCN (Operating Company Number) : 8697 Coverage Area Name : DAMASCUS Latitude : 39.2904 Longitude : -77.2083 ‹ previous : 240-364 next › : 240-365 Telephone Number List 240-365-0000 ~ 240-365-9999