Area Code 603-256 located in CHESTERFIELD, CHESHIRE, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 256 City : CHESTERFIELD County : CHESHIRE State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1996-01-10 FIPS (Federal Information Processing Standards) : 33005 LATA (Local Access Transport Area) : 122 Rate Center : WCHESTEFLD ZIP Code Count : 123 ZIP Code Frequency : 11 ZIP Code : 03443 Other Information NPANXX : 603256 County Population : 0 Switch CLLI (Common Language Location Identifier) : BRBOVTMADS2 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 : WEST CHESTERFIELD Latitude : 42.8552 Longitude : -72.5587 ‹ previous : 603-256 next › : 603-256 Telephone Number List 603-256-0000 ~ 603-256-9999