Area Code 603-230 located in LOUDON, MERRIMACK, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 230 City : LOUDON County : MERRIMACK State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1996-10-15 FIPS (Federal Information Processing Standards) : 33013 LATA (Local Access Transport Area) : 122 Rate Center : CONCORD ZIP Code Count : 5 ZIP Code Frequency : 2 ZIP Code : 03307 Other Information NPANXX : 603230 County Population : 0 Switch CLLI (Common Language Location Identifier) : CNCRNHSODS1 MSA CBSA (Core Based Statistical Area) : Concord, NH MSA CBSA Code (Core Based Statistical Area) : 18180 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 : CONCORD Latitude : 43.2035 Longitude : -71.5397 ‹ previous : 603-230 next › : 603-230 Telephone Number List 603-230-0000 ~ 603-230-9999