Area Code 603-422 located in NEW CASTLE, ROCKINGHAM, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 422 City : NEW CASTLE County : ROCKINGHAM State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 33015 LATA (Local Access Transport Area) : 122 Rate Center : PORTSMOUTH ZIP Code Count : 9 ZIP Code Frequency : 3 ZIP Code : 03854 Other Information NPANXX : 603422 County Population : 0 Switch CLLI (Common Language Location Identifier) : PTMONHISDS1 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 : PORTSMOUTH Latitude : 43.0735 Longitude : -70.7636 ‹ previous : 603-422 next › : 603-422 Telephone Number List 603-422-0000 ~ 603-422-9999