Area Code 240-304 located in DISTRICT HEIGHTS, PRINCE GEORGES, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 304 City : DISTRICT HEIGHTS County : PRINCE GEORGES State : MD (Maryland) NXX Use Type : Wireless NXX Intro Version : 2003-02-09 FIPS (Federal Information Processing Standards) : 24033 LATA (Local Access Transport Area) : 236 Rate Center : WSHNGTNZN5 ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 20747 Other Information NPANXX : 240304 County Population : 0 Switch CLLI (Common Language Location Identifier) : SLSPMDEJCM1 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 : SPRINT SPECTRUM L.P. - MD OCN (Operating Company Number) : 4098 Coverage Area Name : MOUNT RAINIER Latitude : 38.9021 Longitude : -77.0233 ‹ previous : 240-304 next › : 240-305 Telephone Number List 240-304-0000 ~ 240-304-9999