Area Code 603-579 located in WINDHAM, ROCKINGHAM, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 579 City : WINDHAM County : ROCKINGHAM State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1997-07-06 FIPS (Federal Information Processing Standards) : 33015 LATA (Local Access Transport Area) : 122 Rate Center : NASHUA ZIP Code Count : 10 ZIP Code Frequency : 2 ZIP Code : 03087 Other Information NPANXX : 603579 County Population : 0 Switch CLLI (Common Language Location Identifier) : NASHNHWPDS1 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 : NO NEW ENGLAND TEL OP DBA FAIRPOINT COMM - NH OCN (Operating Company Number) : 5113 Coverage Area Name : NASHUA Latitude : 42.7575 Longitude : -71.4674 ‹ previous : 603-579 next › : 603-579 Telephone Number List 603-579-0000 ~ 603-579-9999