Area Code 603

Area Code 603
Post Office City: Amherst, NH
County: Hillsborough County County
Timezone: America/New_York
Coordinates: -71.61, 42.86
Area Code: 603

What is the Area Code?

In the United States, the "Area Code" is a numerical prefix used in phone numbers to identify a specific geographic region within the country. These area codes are part of the telephone numbering system and are essential for the proper routing of calls.

The area code typically consists of three digits and precedes the local phone number. For example, in the phone number (212) 555-1234, "212" is the area code that corresponds to a part of New York City.

Functions of the Area Code:

Geographic Identification: Allows the determination of the region or city from which a call originates. Call Routing: Helps telephone service providers direct calls efficiently through their network. Number Distribution: Facilitates the assignment and organization of phone numbers to avoid conflicts and duplications. Billing: Sometimes, call costs can vary depending on the area code, especially for long-distance calls. In summary, area codes are fundamental to the functioning of the telephone system in the United States, ensuring that calls are connected correctly and managed in an orderly manner.

603

Cities and counties within 603 Area Code

Here are the cities and towns for Area Code 603 that the US Post Office accepts. The city listed as the main city is usually where the main post office is located. When sending a letter or package, always include your preferred city to ensure your delivery is as successful as possible

Primary CityAceptable CitiesStateCountyZIPArea codesTimezone
Amherst--New Hampshire(NH)Hillsborough County03031603America/New_York
Auburn--New Hampshire(NH)Rockingham County03032603America/New_York
Brookline--New Hampshire(NH)Hillsborough County03033603America/New_York
Candia--New Hampshire(NH)Rockingham County03034603America/New_York
Chester--New Hampshire(NH)Rockingham County03036603America/New_York
Deerfield--New Hampshire(NH)Rockingham County03037603America/New_York
DerryLondonderryNew Hampshire(NH)Rockingham County03038603America/New_York
East Candia--New Hampshire(NH)Rockingham County03040603America/New_York
East Derry--New Hampshire(NH)Rockingham County03041603America/New_York
Epping--New Hampshire(NH)Rockingham County03042603America/New_York
Francestown--New Hampshire(NH)Hillsborough County03043603America/New_York
Fremont--New Hampshire(NH)Rockingham County03044603America/New_York
Goffstown--New Hampshire(NH)Hillsborough County03045603America/New_York
Dunbarton--New Hampshire(NH)Merrimack County03046603America/New_York
Greenfield--New Hampshire(NH)Hillsborough County03047603America/New_York
GreenvilleMasonNew Hampshire(NH)Hillsborough County03048603America/New_York
Hollis--New Hampshire(NH)Hillsborough County03049603America/New_York
Hudson--New Hampshire(NH)Hillsborough County03051603America/New_York
Litchfield--New Hampshire(NH)Hillsborough County03052603America/New_York
Londonderry--New Hampshire(NH)Rockingham County03053603America/New_York
Merrimack--New Hampshire(NH)Hillsborough County03054603America/New_York
Milford--New Hampshire(NH)Hillsborough County03055603America/New_York
Mont Vernon--New Hampshire(NH)Hillsborough County03057603America/New_York
Nashua--New Hampshire(NH)Hillsborough County03060603America/New_York
Nashua--New Hampshire(NH)Hillsborough County03061603America/New_York
Nashua--New Hampshire(NH)Hillsborough County03062603, 802America/New_York
Nashua--New Hampshire(NH)Hillsborough County03063603America/New_York
Nashua--New Hampshire(NH)Hillsborough County03064603America/New_York
New Boston--New Hampshire(NH)Hillsborough County03070603America/New_York
New Ipswich--New Hampshire(NH)Hillsborough County03071603America/New_York
North Salem--New Hampshire(NH)Rockingham County03073603America/New_York
Pelham--New Hampshire(NH)Hillsborough County03076603America/New_York
Raymond--New Hampshire(NH)Rockingham County03077603America/New_York
Salem--New Hampshire(NH)Rockingham County03079603America/New_York
Lyndeborough--New Hampshire(NH)Hillsborough County03082603America/New_York
Temple--New Hampshire(NH)Hillsborough County03084603America/New_York
Wilton--New Hampshire(NH)Hillsborough County03086603America/New_York
Windham--New Hampshire(NH)Rockingham County03087603America/New_York
Manchester--New Hampshire(NH)Hillsborough County03101603America/New_York
Manchester--New Hampshire(NH)Hillsborough County03102603America/New_York
Manchester--New Hampshire(NH)Hillsborough County03103603America/New_York
Manchester--New Hampshire(NH)Hillsborough County03104603America/New_York
Manchester--New Hampshire(NH)Hillsborough County03105603America/New_York
HooksettManchesterNew Hampshire(NH)Merrimack County03106603America/New_York
Manchester--New Hampshire(NH)Hillsborough County03107603America/New_York
Manchester--New Hampshire(NH)Hillsborough County03108603America/New_York
Manchester--New Hampshire(NH)Hillsborough County03109603America/New_York
Bedford--New Hampshire(NH)Hillsborough County03110603America/New_York
Manchester--New Hampshire(NH)Hillsborough County03111603America/New_York
Waterville ValleyWatervl VlyNew Hampshire(NH)Grafton County03215603America/New_York
Andover--New Hampshire(NH)Merrimack County03216603America/New_York
Ashland--New Hampshire(NH)Grafton County03217603America/New_York
Barnstead--New Hampshire(NH)Belknap County03218603America/New_York
Belmont--New Hampshire(NH)Belknap County03220603America/New_York
Bradford--New Hampshire(NH)Merrimack County03221603America/New_York
BristolAlexandriaNew Hampshire(NH)Grafton County03222603America/New_York
CamptonEllsworth, ThorntonNew Hampshire(NH)Grafton County03223603America/New_York
Canterbury--New Hampshire(NH)Merrimack County03224603America/New_York
Center BarnsteadCtr BarnsteadNew Hampshire(NH)Belknap County03225603America/New_York
Center Harbor--New Hampshire(NH)Belknap County03226603America/New_York
Center SandwichCtr Sandwich, SandwichNew Hampshire(NH)Carroll County03227603America/New_York
ContoocookHopkintonNew Hampshire(NH)Merrimack County03229603America/New_York
Danbury--New Hampshire(NH)Merrimack County03230603America/New_York
East Andover--New Hampshire(NH)Merrimack County03231603America/New_York
Elkins--New Hampshire(NH)Merrimack County03233603America/New_York
Epsom--New Hampshire(NH)Merrimack County03234603America/New_York
Franklin--New Hampshire(NH)Merrimack County03235603America/New_York
Gilmanton--New Hampshire(NH)Belknap County03237603America/New_York
Glencliff--New Hampshire(NH)Grafton County03238603America/New_York
Grafton--New Hampshire(NH)Grafton County03240603America/New_York
HebronEast HebronNew Hampshire(NH)Grafton County03241603America/New_York
Henniker--New Hampshire(NH)Merrimack County03242603America/New_York
Hill--New Hampshire(NH)Merrimack County03243603America/New_York
HillsboroughDeering, Hillsboro, WindsorNew Hampshire(NH)Hillsborough County03244603America/New_York
Holderness--New Hampshire(NH)Grafton County03245603America/New_York
Laconia--New Hampshire(NH)Belknap County03246603America/New_York
Laconia--New Hampshire(NH)Belknap County03247603America/New_York
Gilford--New Hampshire(NH)Belknap County03249603America/New_York
Lincoln--New Hampshire(NH)Grafton County03251603America/New_York
Lochmere--New Hampshire(NH)Belknap County03252603America/New_York
Meredith--New Hampshire(NH)Belknap County03253603America/New_York
MoultonboroughMoultonboroNew Hampshire(NH)Carroll County03254603America/New_York
NewburyMount SunapeeNew Hampshire(NH)Merrimack County03255603America/New_York
New Hampton--New Hampshire(NH)Belknap County03256603America/New_York
New London--New Hampshire(NH)Merrimack County03257603America/New_York
Chichester--New Hampshire(NH)Merrimack County03258603America/New_York
North SandwichN SandwichNew Hampshire(NH)Carroll County03259603America/New_York
North Sutton--New Hampshire(NH)Merrimack County03260603America/New_York
Northwood--New Hampshire(NH)Rockingham County03261603America/New_York
North WoodstockN WoodstockNew Hampshire(NH)Grafton County03262603America/New_York
Pittsfield--New Hampshire(NH)Merrimack County03263603America/New_York
Plymouth--New Hampshire(NH)Grafton County03264603America/New_York
RumneyDorchesterNew Hampshire(NH)Grafton County03266603America/New_York
Salisbury--New Hampshire(NH)Merrimack County03268603America/New_York
Sanbornton--New Hampshire(NH)Belknap County03269603America/New_York
South Newbury--New Hampshire(NH)Merrimack County03272603America/New_York
South Sutton--New Hampshire(NH)Merrimack County03273603America/New_York
Stinson Lake--New Hampshire(NH)Grafton County03274603America/New_York
SuncookAllenstown, PembrokeNew Hampshire(NH)Merrimack County03275603America/New_York
TiltonNorthfieldNew Hampshire(NH)Belknap County03276603America/New_York
Warner--New Hampshire(NH)Merrimack County03278603America/New_York
Warren--New Hampshire(NH)Grafton County03279603America/New_York
Washington--New Hampshire(NH)Sullivan County03280603America/New_York
Weare--New Hampshire(NH)Hillsborough County03281603America/New_York
Wentworth--New Hampshire(NH)Grafton County03282603America/New_York
Springfield--New Hampshire(NH)Sullivan County03284603America/New_York
Thornton--New Hampshire(NH)Grafton County03285603America/New_York
Wilmot--New Hampshire(NH)Merrimack County03287603America/New_York
Winnisquam--New Hampshire(NH)Belknap County03289603America/New_York
Nottingham--New Hampshire(NH)Rockingham County03290603America/New_York
West NottinghamW NottinghamNew Hampshire(NH)Rockingham County03291603America/New_York
Woodstock--New Hampshire(NH)Grafton County03293603America/New_York
Tilton--New Hampshire(NH)Belknap County03298603America/New_York
Tilton--New Hampshire(NH)Belknap County03299603America/New_York
Concord--New Hampshire(NH)Merrimack County03301603America/New_York
Concord--New Hampshire(NH)Merrimack County03302603America/New_York
ConcordBoscawen, Penacook, WebsterNew Hampshire(NH)Merrimack County03303603America/New_York
Bow--New Hampshire(NH)Merrimack County03304603America/New_York
Concord--New Hampshire(NH)Merrimack County03305603America/New_York
Loudon--New Hampshire(NH)Merrimack County03307603America/New_York
KeeneNorth Swanzey, Roxbury, SurryNew Hampshire(NH)Cheshire County03431603America/New_York
Keene--New Hampshire(NH)Cheshire County03435603America/New_York
Antrim--New Hampshire(NH)Hillsborough County03440603America/New_York
Ashuelot--New Hampshire(NH)Cheshire County03441603America/New_York
Bennington--New Hampshire(NH)Hillsborough County03442603America/New_York
Chesterfield--New Hampshire(NH)Cheshire County03443603America/New_York
Dublin--New Hampshire(NH)Cheshire County03444603America/New_York
Sullivan--New Hampshire(NH)Cheshire County03445603America/New_York
Swanzey--New Hampshire(NH)Cheshire County03446603America/New_York
Fitzwilliam--New Hampshire(NH)Cheshire County03447603America/New_York
Gilsum--New Hampshire(NH)Cheshire County03448603America/New_York
Hancock--New Hampshire(NH)Hillsborough County03449603America/New_York
Harrisville--New Hampshire(NH)Cheshire County03450603America/New_York
Hinsdale--New Hampshire(NH)Cheshire County03451603America/New_York
Jaffrey--New Hampshire(NH)Cheshire County03452603America/New_York
Marlborough--New Hampshire(NH)Cheshire County03455603America/New_York
Marlow--New Hampshire(NH)Cheshire County03456603America/New_York
NelsonMunsonvilleNew Hampshire(NH)Cheshire County03457603America/New_York
PeterboroughSharonNew Hampshire(NH)Hillsborough County03458603America/New_York
Rindge--New Hampshire(NH)Cheshire County03461603America/New_York
Spofford--New Hampshire(NH)Cheshire County03462603America/New_York
Stoddard--New Hampshire(NH)Cheshire County03464603America/New_York
Troy--New Hampshire(NH)Cheshire County03465603America/New_York
West ChesterfieldW ChesterfldNew Hampshire(NH)Cheshire County03466603America/New_York
Westmoreland--New Hampshire(NH)Cheshire County03467603America/New_York
West PeterboroughW PeterboroNew Hampshire(NH)Hillsborough County03468603America/New_York
West Swanzey--New Hampshire(NH)Cheshire County03469603America/New_York
WinchesterRichmondNew Hampshire(NH)Cheshire County03470603America/New_York
Littleton--New Hampshire(NH)Grafton County03561603America/New_York
Berlin--New Hampshire(NH)Coos County03570603America/New_York
Bethlehem--New Hampshire(NH)Grafton County03574603America/New_York
Bretton Woods--New Hampshire(NH)Coos County03575603America/New_York
ColebrookDixville, StewartstownNew Hampshire(NH)Coos County03576603America/New_York
ErrolWentworths Location, Wntwrths LctnNew Hampshire(NH)Coos County03579603, 207America/New_York
Franconia--New Hampshire(NH)Grafton County03580603America/New_York
GorhamShelburneNew Hampshire(NH)Coos County03581603America/New_York
GrovetonNorthumberland, Northumberlnd, StarkNew Hampshire(NH)Coos County03582603America/New_York
Jefferson--New Hampshire(NH)Coos County03583603America/New_York
Lancaster--New Hampshire(NH)Coos County03584603America/New_York
LisbonLandaff, LymanNew Hampshire(NH)Grafton County03585603America/New_York
Sugar Hill--New Hampshire(NH)Grafton County03586603America/New_York
MilanDummerNew Hampshire(NH)Coos County03588603America/New_York
Mount WashingtonMt WashingtonNew Hampshire(NH)Coös County03589603America/New_York
North StratfordN Stratford, StratfordNew Hampshire(NH)Coos County03590603, 802America/New_York
PittsburgClarksvilleNew Hampshire(NH)Coos County03592603America/New_York
Randolph--New Hampshire(NH)Coos County03593603America/New_York
Twin Mountain--New Hampshire(NH)Coos County03595603America/New_York
West StewartstownW StewartstwnNew Hampshire(NH)Coös County03597603America/New_York
WhitefieldCarroll, DaltonNew Hampshire(NH)Coos County03598603America/New_York
Acworth--New Hampshire(NH)Sullivan County03601603America/New_York
AlsteadLangdonNew Hampshire(NH)Cheshire County03602603America/New_York
Charlestown--New Hampshire(NH)Sullivan County03603603America/New_York
Drewsville--New Hampshire(NH)Cheshire County03604603America/New_York
LempsterEast LempsterNew Hampshire(NH)Sullivan County03605603America/New_York
South Acworth--New Hampshire(NH)Sullivan County03607603America/New_York
Walpole--New Hampshire(NH)Cheshire County03608603America/New_York
North Walpole--New Hampshire(NH)Cheshire County03609603America/New_York
Bath--New Hampshire(NH)Grafton County03740603America/New_York
CanaanOrangeNew Hampshire(NH)Grafton County03741603America/New_York
Claremont--New Hampshire(NH)Sullivan County03743603America/New_York
Cornish--New Hampshire(NH)Sullivan County03745603America/New_York
Cornish Flat--New Hampshire(NH)Sullivan County03746603America/New_York
Enfield--New Hampshire(NH)Grafton County03748603America/New_York
Enfield CenterEnfield CtrNew Hampshire(NH)Grafton County03749603America/New_York
Etna--New Hampshire(NH)Grafton County03750603America/New_York
Georges Mills--New Hampshire(NH)Sullivan County03751603America/New_York
Goshen--New Hampshire(NH)Sullivan County03752603America/New_York
Grantham--New Hampshire(NH)Sullivan County03753603America/New_York
Guild--New Hampshire(NH)Sullivan County03754603America/New_York
Hanover--New Hampshire(NH)Grafton County03755603America/New_York
Lebanon--New Hampshire(NH)Grafton County03756603America/New_York
Haverhill--New Hampshire(NH)Grafton County03765603America/New_York
Lebanon--New Hampshire(NH)Grafton County03766603America/New_York
Lyme--New Hampshire(NH)Grafton County03768603America/New_York
Lyme Center--New Hampshire(NH)Grafton County03769603America/New_York
Meriden--New Hampshire(NH)Sullivan County03770603America/New_York
Monroe--New Hampshire(NH)Grafton County03771603America/New_York
NewportCroydonNew Hampshire(NH)Sullivan County03773603America/New_York
North HaverhillN HaverhillNew Hampshire(NH)Grafton County03774603America/New_York
Orford--New Hampshire(NH)Grafton County03777603America/New_York
Piermont--New Hampshire(NH)Grafton County03779603America/New_York
Pike--New Hampshire(NH)Grafton County03780603America/New_York
Plainfield--New Hampshire(NH)Sullivan County03781603America/New_York
Sunapee--New Hampshire(NH)Sullivan County03782603America/New_York
West Lebanon--New Hampshire(NH)Grafton County03784603America/New_York
WoodsvilleBentonNew Hampshire(NH)Grafton County03785603America/New_York
PortsmouthNewingtonNew Hampshire(NH)Rockingham County03801603America/New_York
Portsmouth--New Hampshire(NH)Rockingham County03802603America/New_York
Portsmouth--New Hampshire(NH)Rockingham County03803603America/New_York
Portsmouth--New Hampshire(NH)Rockingham County03804603America/New_York
NewingtonPortsmouthNew Hampshire(NH)Rockingham County03805603America/New_York
Alton--New Hampshire(NH)Belknap County03809603America/New_York
Alton Bay--New Hampshire(NH)Belknap County03810603America/New_York
Atkinson--New Hampshire(NH)Rockingham County03811603America/New_York
BartlettHarts Lctn, Harts LocationNew Hampshire(NH)Carroll County03812603America/New_York
Center ConwayChathamNew Hampshire(NH)Carroll County03813603America/New_York
Center OssipeeCtr OssipeeNew Hampshire(NH)Carroll County03814603America/New_York
Center StraffordCtr StraffordNew Hampshire(NH)Strafford County03815603, 978America/New_York
Center TuftonboroCtr TuftnboroNew Hampshire(NH)Carroll County03816603America/New_York
Chocorua--New Hampshire(NH)Carroll County03817603America/New_York
ConwayAlbanyNew Hampshire(NH)Carroll County03818603America/New_York
Danville--New Hampshire(NH)Rockingham County03819603America/New_York
Dover--New Hampshire(NH)Strafford County03820603America/New_York
Dover--New Hampshire(NH)Strafford County03821603America/New_York
Dover--New Hampshire(NH)Strafford County03822603America/New_York
Madbury--New Hampshire(NH)Strafford County03823603America/New_York
DurhamLeeNew Hampshire(NH)Strafford County03824603America/New_York
Barrington--New Hampshire(NH)Strafford County03825603America/New_York
East HampsteadE HampsteadNew Hampshire(NH)Rockingham County03826603America/New_York
East KingstonSouth HamptonNew Hampshire(NH)Rockingham County03827603America/New_York
East WakefieldE WakefieldNew Hampshire(NH)Carroll County03830603America/New_York
Eaton Center--New Hampshire(NH)Carroll County03832603America/New_York
ExeterBrentwood, KensingtonNew Hampshire(NH)Rockingham County03833603America/New_York
Farmington--New Hampshire(NH)Strafford County03835603America/New_York
Freedom--New Hampshire(NH)Carroll County03836603America/New_York
Gilmanton Iron WorksGilmanton IwNew Hampshire(NH)Belknap County03837603America/New_York
Glen--New Hampshire(NH)Carroll County03838603America/New_York
Rochester--New Hampshire(NH)Strafford County03839603America/New_York
Greenland--New Hampshire(NH)Rockingham County03840603America/New_York
Hampstead--New Hampshire(NH)Rockingham County03841603America/New_York
Hampton--New Hampshire(NH)Rockingham County03842603America/New_York
Hampton--New Hampshire(NH)Rockingham County03843603America/New_York
Hampton Falls--New Hampshire(NH)Rockingham County03844603America/New_York
Intervale--New Hampshire(NH)Carroll County03845603America/New_York
Jackson--New Hampshire(NH)Carroll County03846603America/New_York
Kearsarge--New Hampshire(NH)Carroll County03847603America/New_York
Kingston--New Hampshire(NH)Rockingham County03848603America/New_York
Madison--New Hampshire(NH)Carroll County03849603America/New_York
Melvin VillageMelvin VlgNew Hampshire(NH)Carroll County03850603America/New_York
Milton--New Hampshire(NH)Strafford County03851603America/New_York
Milton Mills--New Hampshire(NH)Strafford County03852603America/New_York
Mirror Lake--New Hampshire(NH)Carroll County03853603America/New_York
New Castle--New Hampshire(NH)Rockingham County03854603America/New_York
New Durham--New Hampshire(NH)Strafford County03855603America/New_York
Newfields--New Hampshire(NH)Rockingham County03856603America/New_York
Newmarket--New Hampshire(NH)Rockingham County03857603America/New_York
Newton--New Hampshire(NH)Rockingham County03858603America/New_York
Newton JunctionNewton JctNew Hampshire(NH)Rockingham County03859603America/New_York
North ConwayHales Lctn, Hales LocationNew Hampshire(NH)Carroll County03860603America/New_York
Lee--New Hampshire(NH)Strafford County03861603America/New_York
North Hampton--New Hampshire(NH)Rockingham County03862603America/New_York
Ossipee--New Hampshire(NH)Carroll County03864603America/New_York
Plaistow--New Hampshire(NH)Rockingham County03865603America/New_York
Rochester--New Hampshire(NH)Strafford County03866603America/New_York
Rochester--New Hampshire(NH)Strafford County03867603America/New_York
Rochester--New Hampshire(NH)Strafford County03868603America/New_York
Rollinsford--New Hampshire(NH)Strafford County03869603America/New_York
Rye--New Hampshire(NH)Rockingham County03870603America/New_York
Rye Beach--New Hampshire(NH)Rockingham County03871603America/New_York
SanbornvilleBrookfieldNew Hampshire(NH)Carroll County03872603America/New_York
Sandown--New Hampshire(NH)Rockingham County03873603America/New_York
Seabrook--New Hampshire(NH)Rockingham County03874603America/New_York
Silver Lake--New Hampshire(NH)Carroll County03875603America/New_York
Somersworth--New Hampshire(NH)Strafford County03878603America/New_York
Effingham--New Hampshire(NH)Carroll County03882603America/New_York
South TamworthS TamworthNew Hampshire(NH)Carroll County03883603America/New_York
Strafford--New Hampshire(NH)Strafford County03884603America/New_York
Stratham--New Hampshire(NH)Rockingham County03885603America/New_York
Tamworth--New Hampshire(NH)Carroll County03886603America/New_York
UnionMiddletonNew Hampshire(NH)Strafford County03887603America/New_York
West Ossipee--New Hampshire(NH)Carroll County03890603America/New_York
Wolfeboro--New Hampshire(NH)Carroll County03894603America/New_York
Wolfeboro FallsWolfeboro FlsNew Hampshire(NH)Carroll County03896603America/New_York
Wonalancet--New Hampshire(NH)Carroll County03897603America/New_York
Lebanon--Maine(ME)York County04027207, 603America/New_York
FryeburgN Fryeburg, North Fryeburg, StowMaine(ME)Oxford County04037207, 603America/New_York
White River JunctionWhite Riv JctVermont(VT)Windsor County05009603America/New_York