Area Code 617-992 located in WALTHAM, MIDDLESEX, MA, more detail is as below. Place NPA (Numbering Plan Area) : 617 NXX (Local Number Prefix) : 992 City : WALTHAM County : MIDDLESEX State : MA (Massachusetts) NXX Use Type : Landline NXX Intro Version : 1996-01-10 FIPS (Federal Information Processing Standards) : 25017 LATA (Local Access Transport Area) : 128 Rate Center : BROOKLINE ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 02453 Other Information NPANXX : 617992 Switch CLLI (Common Language Location Identifier) : CMBRMAORDS0 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 : MCI WORLDCOM COMMUNICATIONS, INC. - MA OCN (Operating Company Number) : 7199 Coverage Area Name : WALTHAM Latitude : 42.3990 Longitude : -71.2675 ‹ previous : 617-991 next › : 617-992 Telephone Number List 617-992-0000 ~ 617-992-9999