Area Code 603-251 located in SALEM, ROCKINGHAM, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 251 City : SALEM County : ROCKINGHAM State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1999-05-10 FIPS (Federal Information Processing Standards) : 33015 LATA (Local Access Transport Area) : 122 Rate Center : SALEM ZIP Code Count : 1 ZIP Code Frequency : 100 ZIP Code : 03079 Other Information NPANXX : 603251 County Population : 0 Switch CLLI (Common Language Location Identifier) : MNCHNHN1FF2 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 : PAETEC COMMUNICATIONS, INC. - NH OCN (Operating Company Number) : 4206 Coverage Area Name : SALEM Latitude : 42.7854 Longitude : -71.2270 ‹ previous : 603-250 next › : 603-252 Telephone Number List 603-251-0000 ~ 603-251-9999