Hudson - 603 dialing code
Dialing code +1 (603) cities
- Concord
- Lincoln
- Union
- Wilton
- Ashland
- Franklin
- Greenville
- Troy
- Dover
- Farmington
- Bradford
- Conway
- Hampton
- Newport
- Winchester
- Plymouth
- Durham
- Milford
- Exeter
- Belmont
- Hillsborough
- Keene
- Lancaster
- Manchester
- Claremont
- Hudson
- Littleton
- Amherst
- Bristol
- Canaan
- New London
- Milton
- Lisbon
- Berlin
- Bethlehem
- Bennington
- Pittsfield
- Raymond
- Rochester
- Alton
- Enfield
- Gorham
- Lebanon
- Bartlett
- Hinsdale
- Hanover
- Plainfield
- Charlestown
- Laconia
- Nashua
- New Hampton
- Hancock
- Portsmouth
- Marlborough
- Walpole
- Antrim
- Blodgett Landing
- Center Ossipee
- Center Sandwich
- Colebrook
- Contoocook
- Derry
- East Merrimack
- Epping
- Goffstown
- Groveton
- Hampton Beach
- Henniker
- Hooksett
- Jaffrey
- Londonderry
- Loudon
- Melvin Village
- Meredith
- Milton Mills
- Mountain Lakes
- Newfields
- Newmarket
- North Conway
- North Walpole
- North Woodstock
- Peterborough
- Pinardville
- Sanbornville
- Seabrook Beach
- Somersworth
- South Hooksett
- Suissevale
- Suncook
- Tilton Northfield
- Warner
- West Stewartstown
- West Swanzey
- Whitefield
- Wolfeboro
- Woodsville