Area Code 603-364 located in GILMANTON IRON WORKS, BELKNAP, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 364 City : GILMANTON IRON WORKS County : BELKNAP State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 33001 LATA (Local Access Transport Area) : 122 Rate Center : GLNTNIRWRS ZIP Code Count : 590 ZIP Code Frequency : 63 ZIP Code : 03837 Other Information NPANXX : 603364 County Population : 0 Switch CLLI (Common Language Location Identifier) : GLTNNHXADS0 MSA CBSA (Core Based Statistical Area) : Laconia, NH MSA CBSA Code (Core Based Statistical Area) : 29060 Time Zone : Eastern (GMT -05:00) Observes Daylight Saving Time : Yes Company : UNION TELEPHONE CO. - NH OCN (Operating Company Number) : 0049 Coverage Area Name : GILMANTON Latitude : 43.4185 Longitude : -71.2964 ‹ previous : 603-364 next › : 603-365 Telephone Number List 603-364-0000 ~ 603-364-9999