Area Code 603-290 located in CONCORD, MERRIMACK, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 290 City : CONCORD County : MERRIMACK State : NH (New Hampshire) NXX Use Type : Wireless NXX Intro Version : 1998-05-18 FIPS (Federal Information Processing Standards) : 33013 LATA (Local Access Transport Area) : 122 Rate Center : CONCORD ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 03303 Other Information NPANXX : 603290 County Population : 0 Switch CLLI (Common Language Location Identifier) : MRMCNHGICM0 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 : UNITED STATES CELLULAR CORP. - NEW HAMPSHIRE OCN (Operating Company Number) : 6290 Coverage Area Name : CONCORD Latitude : 43.2007 Longitude : -71.5348 ‹ previous : 603-289 next › : 603-291 Telephone Number List 603-290-0000 ~ 603-290-9999