Area Code 978-392 located in GROTON, MIDDLESEX, MA, more detail is as below. Place NPA (Numbering Plan Area) : 978 NXX (Local Number Prefix) : 392 City : GROTON County : MIDDLESEX State : MA (Massachusetts) NXX Use Type : Landline NXX Intro Version : 1997-10-11 FIPS (Federal Information Processing Standards) : 25017 LATA (Local Access Transport Area) : 128 Rate Center : WESTFORD ZIP Code Count : 48 ZIP Code Frequency : 3 ZIP Code : 01450 Other Information NPANXX : 978392 Switch CLLI (Common Language Location Identifier) : WSFRMADEDS1 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 : WESTFORD Latitude : 42.5958 Longitude : -71.4311 ‹ previous : 978-391 next › : 978-392 Telephone Number List 978-392-0000 ~ 978-392-9999