Area Code 603-671 located in FRANKLIN, MERRIMACK, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 671 City : FRANKLIN County : MERRIMACK State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1998-08-14 FIPS (Federal Information Processing Standards) : 33013 LATA (Local Access Transport Area) : 122 Rate Center : FRANKLIN ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 03235 Other Information NPANXX : 603671 County Population : 0 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 : BROOKS FIBER COMMUNICATIONS OF NEW HAMPSHIRE - NH OCN (Operating Company Number) : 7778 Coverage Area Name : FRANKLIN Latitude : 43.4405 Longitude : -71.6453 ‹ previous : 603-670 next › : 603-672 Telephone Number List 603-671-0000 ~ 603-671-9999