Area Code 603-978 located in EXETER, ROCKINGHAM, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 978 City : EXETER County : ROCKINGHAM State : NH (New Hampshire) NXX Use Type : Wireless NXX Intro Version : 2001-06-30 FIPS (Federal Information Processing Standards) : 33015 LATA (Local Access Transport Area) : 122 Rate Center : DOVER ZIP Code Count : 1 ZIP Code Frequency : 100 ZIP Code : 03833 Other Information NPANXX : 603978 County Population : 0 Switch CLLI (Common Language Location Identifier) : DOVRNHCF0MD 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 : NEW CINGULAR WIRELESS PCS, LLC - DC OCN (Operating Company Number) : 4036 Coverage Area Name : DOVER Latitude : 43.1943 Longitude : -70.8765 ‹ previous : 603-977 next › : 603-986 Telephone Number List 603-978-0000 ~ 603-978-9999