Area Code 603-473 located in UNION, CARROLL, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 473 City : UNION 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 : MILTON ML ZIP Code Count : 471 ZIP Code Frequency : 53 ZIP Code : 03887 Other Information NPANXX : 603473 County Population : 0 Switch CLLI (Common Language Location Identifier) : MTMLNHWERS1 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 : MILTON MILLS Latitude : 43.4975 Longitude : -70.9612 ‹ previous : 603-473 next › : 603-474 Telephone Number List 603-473-0000 ~ 603-473-9999