Area Code 240-220 located in POOLESVILLE, MONTGOMERY, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 220 City : POOLESVILLE County : MONTGOMERY State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 1999-02-27 FIPS (Federal Information Processing Standards) : 24031 LATA (Local Access Transport Area) : 236 Rate Center : POOLESVL ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 20837 Other Information NPANXX : 240220 County Population : 0 Switch CLLI (Common Language Location Identifier) : RSTNVA31DS0 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 : GLOBAL NAPS SOUTH, INC. - MD OCN (Operating Company Number) : 2554 Coverage Area Name : POOLESVILLE Latitude : 39.1419 Longitude : -77.4196 ‹ previous : 240-219 next › : 240-221 Telephone Number List 240-220-0000 ~ 240-220-9999