Area Code 603-710 located in ERROL, COOS, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 710 City : ERROL County : COOS State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1999-05-10 FIPS (Federal Information Processing Standards) : 33007 LATA (Local Access Transport Area) : 122 Rate Center : ERROL ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 03579 Other Information NPANXX : 603710 County Population : 0 Switch CLLI (Common Language Location Identifier) : MNCHNHN1FF2 MSA CBSA (Core Based Statistical Area) : Berlin, NH-VT MSA CBSA Code (Core Based Statistical Area) : 13620 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : MERRIMACK COUNTY TELEPHONE CO. OCN (Operating Company Number) : 0047 Coverage Area Name : CONTOOCOOK Latitude : 43.2252 Longitude : -71.7174 ‹ previous : 603-709 next › : 603-712 Telephone Number List 603-710-0000 ~ 603-710-9999