Area Code 410-442 located in COOKSVILLE, HOWARD, MD, more detail is as below. Place NPA (Numbering Plan Area) : 410 NXX (Local Number Prefix) : 442 City : COOKSVILLE County : HOWARD State : MD (Maryland) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 24027 LATA (Local Access Transport Area) : 238 Rate Center : ELLICOTTCY ZIP Code Count : 66 ZIP Code Frequency : 3 ZIP Code : 21723 Other Information NPANXX : 410442 Switch CLLI (Common Language Location Identifier) : GLWDMDGDRS1 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 Company : VERIZON MARYLAND, INC. OCN (Operating Company Number) : 9212 Coverage Area Name : GLENWOOD Latitude : 39.3260 Longitude : -77.0250 ‹ previous : 410-442 next › : 410-442 Telephone Number List 410-442-0000 ~ 410-442-9999