Area Code 240-318 located in ANDREWS AIR FORCE BASE, PRINCE GEORGES, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 318 City : ANDREWS AIR FORCE BASE County : PRINCE GEORGES State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 2000-01-14 FIPS (Federal Information Processing Standards) : 24033 LATA (Local Access Transport Area) : 236 Rate Center : WSNGTNZN16 ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 20762 Other Information NPANXX : 240318 County Population : 0 Switch CLLI (Common Language Location Identifier) : CLTNMDCLDS0 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 : VERIZON MARYLAND, INC. OCN (Operating Company Number) : 9212 Coverage Area Name : CLINTON Latitude : 38.7717 Longitude : -76.8744 ‹ previous : 240-318 next › : 240-319 Telephone Number List 240-318-0000 ~ 240-318-9999