Area Code 603-512 located in WINDHAM, ROCKINGHAM, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 512 City : WINDHAM County : ROCKINGHAM State : NH (New Hampshire) NXX Use Type : Wireless NXX Intro Version : 1999-05-10 FIPS (Federal Information Processing Standards) : 33015 LATA (Local Access Transport Area) : 122 Rate Center : MANCHESTER ZIP Code Count : 1 ZIP Code Frequency : 33 ZIP Code : 03087 Other Information NPANXX : 603512 County Population : 0 Switch CLLI (Common Language Location Identifier) : LDRYNHEMCM0 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 : SPRINT SPECTRUM L.P. OCN (Operating Company Number) : 6664 Coverage Area Name : MANCHESTER Latitude : 42.9935 Longitude : -71.4608 ‹ previous : 603-512 next › : 603-513 Telephone Number List 603-512-0000 ~ 603-512-9999