Area Code 603-343 located in DOVER, STRAFFORD, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 343 City : DOVER County : STRAFFORD State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 2000-06-13 FIPS (Federal Information Processing Standards) : 33017 LATA (Local Access Transport Area) : 122 Rate Center : DOVER ZIP Code Count : 264 ZIP Code Frequency : 87 ZIP Code : 03820 Other Information NPANXX : 603343 County Population : 0 Switch CLLI (Common Language Location Identifier) : MNCHNHIEW01 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 : COMCAST PHONE OF NEW HAMPSHIRE, LLC - NH OCN (Operating Company Number) : 4112 Coverage Area Name : DOVER Latitude : 43.1943 Longitude : -70.8765 ‹ previous : 603-343 next › : 603-344 Telephone Number List 603-343-0000 ~ 603-343-9999