Area Code 617-250 located in CAMBRIDGE, MIDDLESEX, MA, more detail is as below. Place NPA (Numbering Plan Area) : 617 NXX (Local Number Prefix) : 250 City : CAMBRIDGE County : MIDDLESEX State : MA (Massachusetts) NXX Use Type : Landline NXX Intro Version : 1997-04-01 FIPS (Federal Information Processing Standards) : 25017 LATA (Local Access Transport Area) : 128 Rate Center : CAMBRIDGE ZIP Code Count : 3 ZIP Code Frequency : 30 ZIP Code : 02142 Other Information NPANXX : 617250 Switch CLLI (Common Language Location Identifier) : CMBRMA01DS5 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 : TELEPORT COMMUNICATIONS GROUP - BOSTON OCN (Operating Company Number) : 7135 Coverage Area Name : CAMBRIDGE Latitude : 42.3676 Longitude : -71.0867 ‹ previous : 617-250 next › : 617-251 Telephone Number List 617-250-0000 ~ 617-250-9999