Area Code 978-577 located in WESTFORD, MIDDLESEX, MA, more detail is as below. Place NPA (Numbering Plan Area) : 978 NXX (Local Number Prefix) : 577 City : WESTFORD County : MIDDLESEX State : MA (Massachusetts) NXX Use Type : Landline NXX Intro Version : 2001-06-30 FIPS (Federal Information Processing Standards) : 25017 LATA (Local Access Transport Area) : 128 Rate Center : WESTFORD ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 01886 Other Information NPANXX : 978577 Switch CLLI (Common Language Location Identifier) : BSTNMACODS7 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 : PAETEC COMMUNICATIONS, INC. OCN (Operating Company Number) : 4084 Coverage Area Name : WESTFORD Latitude : 42.5858 Longitude : -71.4341 ‹ previous : 978-576 next › : 978-578 Telephone Number List 978-577-0000 ~ 978-577-9999