Area Code 603-367 located in MADISON, CARROLL, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 367 City : MADISON 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 : MADISON ZIP Code Count : 1063 ZIP Code Frequency : 76 ZIP Code : 03849 Other Information NPANXX : 603367 County Population : 0 Switch CLLI (Common Language Location Identifier) : MDSNNHYARS1 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 : MADISON Latitude : 43.8999 Longitude : -71.1454 ‹ previous : 603-367 next › : 603-368 Telephone Number List 603-367-0000 ~ 603-367-9999