Area Code 240-456 located in COLUMBIA, HOWARD, MD, more detail is as below. Place NPA (Numbering Plan Area) : 240 NXX (Local Number Prefix) : 456 City : COLUMBIA County : HOWARD State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 2000-08-20 FIPS (Federal Information Processing Standards) : 24027 LATA (Local Access Transport Area) : 236 Rate Center : LAUREL236 ZIP Code Count : 1 ZIP Code Frequency : 50 ZIP Code : 21045 Other Information NPANXX : 240456 County Population : 0 Switch CLLI (Common Language Location Identifier) : LARLMDLRDS0 MSA CBSA (Core Based Statistical Area) : Baltimore-Towson, MD MSA CBSA Code (Core Based Statistical Area) : 12580 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 : LAUREL Latitude : 39.1038 Longitude : -76.8499 ‹ previous : 240-455 next › : 240-456 Telephone Number List 240-456-0000 ~ 240-456-9999