Area Code 240-535 located in PRINCE FREDERICK, CALVERT, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 535 City : PRINCE FREDERICK County : CALVERT State : MD (Maryland) NXX Use Type : Wireless NXX Intro Version : 2001-06-30 FIPS (Federal Information Processing Standards) : 24009 LATA (Local Access Transport Area) : 236 Rate Center : WSHNGTNZN3 ZIP Code Count : 1 ZIP Code Frequency : 100 ZIP Code : 20678 Other Information NPANXX : 240535 County Population : 0 Switch CLLI (Common Language Location Identifier) : WASHDCDTX6X 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 : NEW CINGULAR WIRELESS PCS, LLC - DC OCN (Operating Company Number) : 4036 Coverage Area Name : SILVER SPRING Latitude : 39.0115 Longitude : -77.0405 ‹ previous : 240-534 next › : 240-536 Telephone Number List 240-535-0000 ~ 240-535-9999