Area Code 603-543 located in CHARLESTOWN, SULLIVAN, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 543 City : CHARLESTOWN County : SULLIVAN State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 33019 LATA (Local Access Transport Area) : 122 Rate Center : CLAREMONT ZIP Code Count : 152 ZIP Code Frequency : 7 ZIP Code : 03603 Other Information NPANXX : 603543 County Population : 0 Switch CLLI (Common Language Location Identifier) : CLMTNHBRRS1 MSA CBSA (Core Based Statistical Area) : Claremont, NH MSA CBSA Code (Core Based Statistical Area) : 17200 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 : CLAREMONT Latitude : 43.3686 Longitude : -72.3398 ‹ previous : 603-542 next › : 603-543 Telephone Number List 603-543-0000 ~ 603-543-9999