Area Code 339-599 located in WALTHAM, MIDDLESEX, MA, more detail is as below. Place NPA (Numbering Plan Area) : 339 NXX (Local Number Prefix) : 599 City : WALTHAM County : MIDDLESEX State : MA (Massachusetts) NXX Use Type : Landline NXX Intro Version : 2006-06-01 FIPS (Federal Information Processing Standards) : 25017 Rate Center : WALTHAM ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 02452 Other Information NPANXX : 339599 County Population : 0 Switch CLLI (Common Language Location Identifier) : NWTNMAWADSZ 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 Latitude : None Longitude : None ‹ previous : 339-599 next › : 339-600 Telephone Number List 339-599-0000 ~ 339-599-9999