The New Hampshire area code is 603. Area code 603 is the original area code for the state of New Hampshire and serves the majority of the state, including the cities of Manchester, Nashua, Concord, and Portsmouth.
| Name | New Hampshire |
|---|---|
| Area Code | 603 |
| ISO Code | US-NH |
| Country | United States (US) |
Counties in New Hampshire
- Belknap County
- Carroll County
- Cheshire County
- Coos County
- Grafton County
- Hillsborough County
- Merrimack County
- Rockingham County
- Strafford County
- Sullivan County
Cities an Towns in New Hampshire
- Acworth
- Alstead
- Alton
- Alton Bay
- Amherst
- Andover
- Antrim
- Ashland
- Ashuelot
- Atkinson
- Auburn
- Barnstead
- Barrington
- Bartlett
- Bath
- Bedford
- Belmont
- Bennington
- Berlin
- Bethlehem
- Bow
- Bradford
- Bretton Woods
- Bristol
- Brookline
- Campton
- Canaan
- Candia
- Canterbury
- Center Barnstead
- Center Conway
- Center Harbor
- Center Ossipee
- Center Sandwich
- Center Strafford
- Center Tuftonboro
- Charlestown
- Chester
- Chesterfield
- Chichester
- Chocorua
- Claremont
- Colebrook
- Concord
- Contoocook
- Conway
- Cornish
- Cornish Flat
- Danbury
- Danville
- Deerfield
- Derry
- Dover
- Drewsville
- Dublin
- Dunbarton
- Durham
- East Andover
- East Candia
- East Derry
- East Hampstead
- East Kingston
- East Wakefield
- Eaton Center
- Effingham
- Elkins
- Enfield
- Enfield Center
- Epping
- Epsom
- Errol
- Etna
- Exeter
- Farmington
- Fitzwilliam
- Francestown
- Franconia
- Franklin
- Freedom
- Fremont
- Georges Mills
- Gilford
- Gilmanton
- Gilmanton Iron Works
- Gilsum
- Glen
- Glencliff
- Goffstown
- Gorham
- Goshen
- Grafton
- Grantham
- Greenfield
- Greenland
- Greenville
- Groveton
- Guild
- Hampstead
- Hampton
- Hampton Falls
- Hancock
- Hanover
- Harrisville
- Haverhill
- Hebron
- Henniker
- Hill
- Hillsborough
- Hinsdale
- Holderness
- Hollis
- Hooksett
- Hudson
- Intervale
- Jackson
- Jaffrey
- Jefferson
- Kearsarge
- Keene
- Kingston
- Laconia
- Lancaster
- Lebanon
- Lee
- Lempster
- Lincoln
- Lisbon
- Litchfield
- Littleton
- Lochmere
- Londonderry
- Loudon
- Lyme
- Lyme Center
- Lyndeborough
- Madbury
- Madison
- Manchester
- Marlborough
- Marlow
- Melvin Village
- Meredith
- Meriden
- Merrimack
- Milan
- Milford
- Milton
- Milton Mills
- Mirror Lake
- Monroe
- Mont Vernon
- Moultonborough
- Mount Washington
- Nashua
- Nelson
- New Boston
- New Castle
- New Durham
- New Hampton
- New Ipswich
- New London
- Newbury
- Newfields
- Newington
- Newmarket
- Newport
- Newton
- Newton Junction
- North Conway
- North Hampton
- North Haverhill
- North Salem
- North Sandwich
- North Stratford
- North Sutton
- North Walpole
- North Woodstock
- Northwood
- Nottingham
- Orford
- Ossipee
- Pelham
- Peterborough
- Piermont
- Pike
- Pittsburg
- Pittsfield
- Plainfield
- Plaistow
- Plymouth
- Portsmouth
- Randolph
- Raymond
- Rindge
- Rochester
- Rollinsford
- Rumney
- Rye
- Rye Beach
- Salem
- Salisbury
- Sanbornton
- Sanbornville
- Sandown
- Seabrook
- Silver Lake
- Somersworth
- South Acworth
- South Newbury
- South Sutton
- South Tamworth
- Spofford
- Springfield
- Stinson Lake
- Stoddard
- Strafford
- Stratham
- Sugar Hill
- Sullivan
- Sunapee
- Suncook
- Swanzey
- Tamworth
- Temple
- Thornton
- Tilton
- Troy
- Twin Mountain
- Union
- Walpole
- Warner
- Warren
- Washington
- Waterville Valley
- Weare
- Wentworth
- West Chesterfield
- West Lebanon
- West Nottingham
- West Ossipee
- West Peterborough
- West Stewartstown
- West Swanzey
- Westmoreland
- Whitefield
- Wilmot
- Wilton
- Winchester
- Windham
- Winnisquam
- Wolfeboro
- Wolfeboro Falls
- Wonalancet
- Woodstock
- Woodsville