Area Code 617-551 located in MEDFORD, MIDDLESEX, MA, more detail is as below. Place NPA (Numbering Plan Area) : 617 NXX (Local Number Prefix) : 551 City : MEDFORD County : MIDDLESEX State : MA (Massachusetts) NXX Use Type : Landline NXX Intro Version : 1998-01-25 FIPS (Federal Information Processing Standards) : 25017 LATA (Local Access Transport Area) : 128 Rate Center : CAMBRIDGE ZIP Code Count : 1 ZIP Code Frequency : 8 ZIP Code : 02155 Other Information NPANXX : 617551 Switch CLLI (Common Language Location Identifier) : CMBRMABEDS1 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 : CAMBRIDGE Latitude : 42.3648 Longitude : -71.0819 ‹ previous : 617-551 next › : 617-551 Telephone Number List 617-551-0000 ~ 617-551-9999