Area Code 603-859 located in NEW DURHAM, STRAFFORD, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 859 City : NEW DURHAM County : STRAFFORD State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 33017 LATA (Local Access Transport Area) : 122 Rate Center : NEW DURHAM ZIP Code Count : 1207 ZIP Code Frequency : 77 ZIP Code : 03855 Other Information NPANXX : 603859 County Population : 0 Switch CLLI (Common Language Location Identifier) : NWDRNHXADS0 MSA CBSA (Core Based Statistical Area) : Boston-Cambridge-Quincy, MA-NH MSA CBSA Code (Core Based Statistical Area) : 14460 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : UNION TELEPHONE CO. - NH OCN (Operating Company Number) : 0049 Coverage Area Name : NEW DURHAM Latitude : 43.4340 Longitude : -71.1728 ‹ previous : 603-859 next › : 603-860 Telephone Number List 603-859-0000 ~ 603-859-9999