Establish a local presence by purchasing a phone number in area code 603. Phone numbers in area code 603 are associated with the state of New Hampshire. There are currently at least 8 U.S. cities and 172 U.S. ZIP Codes associated with this telephone area code. In addition, there are at least 800 NXX's (the three-digit code that makes up digits 4-6 of a standard 10-digit U.S. phone number) available for use along with area code 603.
Phone numbers in area code 603 are associated with the state of New Hampshire.
The 603 area code currently has at least 8 cities in New Hampshire associated with it: East Concord, NH; Derry, NH; Dover, NH; Keene, NH; Manchester, NH; Nashua, NH; Portsmouth, NH; and Rochester, NH.
There are at least 172 U.S. ZIP codes associated with the area code 603 at this time (view all here).
The ZIP Code 03103 is the ZIP Code most frequently connected to the 603 area code. The 03103 ZIP Code is primarily associated with Hillsborough County in the state of New Hampshire.
There are 10 counties associated with the 603 area code: Rockingham County; Hillsborough; Grafton County; Cheshire County; Coos County; Merrimack County; Carroll County; Strafford County; Belknap County; Sullivan County.
An NXX, which is also known as the a "central office code" or an "exchange", is the three-digit sequence that comprises digits 4-6 of a standard 10-digit U.S. phone number. The NXX is the second main part of a phone number that comes directly after the area code, e.g. (603)-288-xxxx.
Detailed information about area code 603 phone numbers. Establish a New Hampshire presence with a 603 number.