Area Code 603-537 located in LONDONDERRY, ROCKINGHAM, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 537 City : LONDONDERRY County : ROCKINGHAM State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1996-04-15 FIPS (Federal Information Processing Standards) : 33015 LATA (Local Access Transport Area) : 122 Rate Center : DERRY ZIP Code Count : 353 ZIP Code Frequency : 35 ZIP Code : 03053 Other Information NPANXX : 603537 County Population : 0 Switch CLLI (Common Language Location Identifier) : DRRYNHEBDS1 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 : DERRY Latitude : 42.8816 Longitude : -71.3203 ‹ previous : 603-536 next › : 603-537 Telephone Number List 603-537-0000 ~ 603-537-9999