Area Code 978-321 located in ANDOVER, ESSEX, MA, more detail is as below. Place NPA (Numbering Plan Area) : 978 NXX (Local Number Prefix) : 321 City : ANDOVER County : ESSEX State : MA (Massachusetts) NXX Use Type : Wireless NXX Intro Version : 1997-10-11 FIPS (Federal Information Processing Standards) : 25009 Rate Center : SUDBURY ZIP Code Count : 1 ZIP Code Frequency : 100 ZIP Code : 01810 Other Information NPANXX : 978321 Switch CLLI (Common Language Location Identifier) : SDBRMABPDS0 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 : 978-320 next › : 978-322 Telephone Number List 978-321-0000 ~ 978-321-9999