Area Code 978-373 located in HAVERHILL, ESSEX, MA, more detail is as below. Place NPA (Numbering Plan Area) : 978 NXX (Local Number Prefix) : 373 City : HAVERHILL County : ESSEX State : MA (Massachusetts) NXX Use Type : Landline NXX Intro Version : 1997-10-11 FIPS (Federal Information Processing Standards) : 25009 LATA (Local Access Transport Area) : 128 Rate Center : HAVERHILL ZIP Code Count : 1448 ZIP Code Frequency : 28 ZIP Code : 01832 Other Information NPANXX : 978373 Switch CLLI (Common Language Location Identifier) : HVHLMAWIDS1 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 : HAVERHILL Latitude : 42.7774 Longitude : -71.0760 ‹ previous : 978-372 next › : 978-373 Telephone Number List 978-373-0000 ~ 978-373-9999