Area Code 603-356 located in INTERVALE, CARROLL, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 356 City : INTERVALE County : CARROLL State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 33003 LATA (Local Access Transport Area) : 122 Rate Center : NO CONWAY ZIP Code Count : 480 ZIP Code Frequency : 10 ZIP Code : 03845 Other Information NPANXX : 603356 County Population : 0 Switch CLLI (Common Language Location Identifier) : NCWYNHKERS1 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : NO NEW ENGLAND TEL OP DBA FAIRPOINT COMM - NH OCN (Operating Company Number) : 5113 Coverage Area Name : NORTH CONWAY Latitude : 44.0528 Longitude : -71.1251 ‹ previous : 603-356 next › : 603-356 Telephone Number List 603-356-0000 ~ 603-356-9999