Area Code 240-428 located in ROCKVILLE, MONTGOMERY, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 428 City : ROCKVILLE County : MONTGOMERY State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 10/14/2009 FIPS (Federal Information Processing Standards) : 24031 LATA (Local Access Transport Area) : 236 Rate Center : WSNGTNZN10 ZIP Code Count : 0 ZIP Code Frequency : 0 ZIP Code : 20851 Other Information NPANXX : 240428 County Population : 0 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 : BANDWIDTH.COM CLEC, LLC - MD OCN (Operating Company Number) : 071F Coverage Area Name : ROCKVILLE Latitude : 39.0867 Longitude : -77.1600 ‹ previous : 240-427 next › : 240-429 Telephone Number List 240-428-0000 ~ 240-428-9999
