603 Area Code is part of 10 counties in the state of New Hampshire. There are around 184 cities in the 603 area code. The 603 area code is located in the EST timezone. New Hampshire has an avarage population of 1,326,038 spread between the coordinates of +43.452492 Latitude and -71.563896 Longitude.
Below you will find more info about 603 Area Code and also zip codes, counties, cities and the post offices that belong to this Area Code.