Area Code 603-435 located in PITTSFIELD, MERRIMACK, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 435 City : PITTSFIELD County : MERRIMACK State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 33013 LATA (Local Access Transport Area) : 122 Rate Center : PITTSFIELD ZIP Code Count : 1461 ZIP Code Frequency : 66 ZIP Code : 03263 Other Information NPANXX : 603435 County Population : 0 Switch CLLI (Common Language Location Identifier) : PTFDNHBRRS1 MSA CBSA (Core Based Statistical Area) : Concord, NH MSA CBSA Code (Core Based Statistical Area) : 18180 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 : PITTSFIELD Latitude : 43.3067 Longitude : -71.3258 ‹ previous : 603-435 next › : 603-436 Telephone Number List 603-435-0000 ~ 603-435-9999