Area Code 617-660 located in CHELSEA, SUFFOLK, MA, more detail is as below. Place NPA (Numbering Plan Area) : 617 NXX (Local Number Prefix) : 660 City : CHELSEA County : SUFFOLK State : MA (Massachusetts) NXX Use Type : Landline NXX Intro Version : 1996-01-10 FIPS (Federal Information Processing Standards) : 25025 LATA (Local Access Transport Area) : 128 Rate Center : CHELSEA ZIP Code Count : 43 ZIP Code Frequency : 96 ZIP Code : 02150 Other Information NPANXX : 617660 Switch CLLI (Common Language Location Identifier) : CHLSMACHDS0 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 : CHELSEA Latitude : 42.3942 Longitude : -71.0330 ‹ previous : 617-660 next › : 617-661 Telephone Number List 617-660-0000 ~ 617-660-9999