Area Code 603-585 located in FITZWILLIAM, CHESHIRE, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 585 City : FITZWILLIAM County : CHESHIRE State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 33005 LATA (Local Access Transport Area) : 122 Rate Center : FITZWILLIM ZIP Code Count : 1154 ZIP Code Frequency : 100 ZIP Code : 03447 Other Information NPANXX : 603585 County Population : 0 Switch CLLI (Common Language Location Identifier) : FTZWNHUTRS1 MSA CBSA (Core Based Statistical Area) : Keene, NH MSA CBSA Code (Core Based Statistical Area) : 28300 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 : FITZWILLIAM Latitude : 42.7819 Longitude : -72.1463 ‹ previous : 603-584 next › : 603-586 Telephone Number List 603-585-0000 ~ 603-585-9999