Area Code 240-257 located in NANJEMOY, CHARLES, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 257 City : NANJEMOY County : CHARLES State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 1999-02-27 FIPS (Federal Information Processing Standards) : 24017 LATA (Local Access Transport Area) : 236 Rate Center : NANJEMOY ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 20662 Other Information NPANXX : 240257 County Population : 0 Switch CLLI (Common Language Location Identifier) : WASHDCTTDS0 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 : TELEPORT COMMUNICATIONS AMERICA, LLC - DC OCN (Operating Company Number) : 7529 Coverage Area Name : NANJEMOY Latitude : 38.4503 Longitude : -77.2163 ‹ previous : 240-256 next › : 240-258 Telephone Number List 240-257-0000 ~ 240-257-9999