Area Code 781-321 located in MALDEN, MIDDLESEX, MA, more detail is as below. Place NPA (Numbering Plan Area) : 781 NXX (Local Number Prefix) : 321 City : MALDEN County : MIDDLESEX State : MA (Massachusetts) NXX Use Type : Landline NXX Intro Version : 1997-10-11 FIPS (Federal Information Processing Standards) : 25017 LATA (Local Access Transport Area) : 128 Rate Center : MALDEN ZIP Code Count : 4535 ZIP Code Frequency : 96 ZIP Code : 02148 Other Information NPANXX : 781321 Switch CLLI (Common Language Location Identifier) : MLDNMAELDS2 MSA CBSA (Core Based Statistical Area) : Boston-Cambridge-Quincy, MA-NH MSA CBSA Code (Core Based Statistical Area) : 14460 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : VERIZON NEW ENGLAND INC. OCN (Operating Company Number) : 9102 Coverage Area Name : MALDEN Latitude : 42.4263 Longitude : -71.0770 ‹ previous : 781-321 next › : 781-322 Telephone Number List 781-321-0000 ~ 781-321-9999