Area Code 603-806 located in DEERFIELD, ROCKINGHAM, NH, more detail is as below. Place NPA (Numbering Plan Area) : 603 NXX (Local Number Prefix) : 806 City : DEERFIELD County : ROCKINGHAM State : NH (New Hampshire) NXX Use Type : Landline NXX Intro Version : 1999-05-10 FIPS (Federal Information Processing Standards) : 33015 Rate Center : DEERFIELD ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 03037 Other Information NPANXX : 603806 County Population : 0 Switch CLLI (Common Language Location Identifier) : MNCHNHN1FF2 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 Latitude : None Longitude : None ‹ previous : 603-805 next › : 603-807 Telephone Number List 603-806-0000 ~ 603-806-9999