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Area Code 603 Location & Details

State / Region: New Hampshire • Country: United States

Major Cities Covered: Manchester, Nashua, Concord, Dover, Rochester, Keene, Portsmouth, Laconia, Lebanon, Claremont

Standard Dial Format
+1 (603) XXX-XXXX
Country Code: +1 (NANP Format)
What State is Area Code 603?
New HampshireState Hub →
Country Territory
United States
603 Area Code Time Zone
Eastern
603 Overlay Codes
No Overlays

Area Code 603 Geographic Map

Interactive location bounds and coverage area for New Hampshire (Eastern Timezone)

Lat: 43.33° • Lng: -71.49°
📍 Geographic Center: New HampshireMap data © OpenStreetMap contributors

Where is Area Code 603 Located?

Telephone area code 603 is assigned to New Hampshire in United States. It serves cities and metropolitan communities including Manchester, Nashua, Concord, Dover, Rochester, Keene, Portsmouth, Laconia, Lebanon, Claremont.

Historical Context & Area Code Overlay Information:603 serves New Hampshire (United States).

For local and long-distance calls within area code 603, standard 10-digit dialing (603) XXX-XXXX applies.

Who Called Me from Area Code 603?

Received an unknown call, missed call, or text scam from area code 603? Here is how to trace who is calling from 603 area code and verify unknown numbers safely:

1.
Identify Missed Calls & Voicemails:

Legitimate contacts usually leave a detailed voicemail or caller ID record.

2.
Watch Out for Neighbor Spoofing:

Robocallers often fake incoming caller ID numbers using your local 603 prefix to boost pick-up rates.

3.
Reverse Phone Lookup Area Code 603:

Search public white-pages or use caller intelligence guides before returning unfamiliar calls.

Learn How Reverse Phone Lookups Work→

How to Call Area Code 603 & Dialing Format

When placing a phone call to a number in area code 603, follow the correct dialing format depending on your calling location:

  • Calling from inside the US / Canada (+1): Dial 1 + (603) + 7-digit number.
  • Calling from an international location outside +1: Dial your country's international exit code (e.g. 011 in US or + on mobile) + 1 + 603 + 7-digit number.
  • Do I need to dial area code 603 for local calls? Yes, 10-digit dialing (area code + line number) is mandatory across North American telephone networks.

Top Cities & Municipalities Served in Area Code 603

Urban centers, census places, and communities within the +1-603 calling area

13 Major Cities Listed
City NameCountyPopulation% of 603 Pop
ManchesterHillsborough County116,81826.3%
NashuaHillsborough County92,43520.8%
ConcordMerrimack County44,59710.0%
DoverStrafford County34,6237.8%
RochesterStrafford County33,7167.6%
KeeneCheshire County23,0725.2%
PortsmouthRockingham County23,0285.2%
LaconiaBelknap County17,2463.9%
LebanonSullivan County15,4813.5%
ClaremontSullivan County13,0322.9%
SomersworthStrafford County12,1712.7%
BerlinCoos County9,5022.1%
FranklinMerrimack County8,8392.0%

Counties Covered by Area Code 603

Geographic county distribution and population coverage across New Hampshire

County NameTotal Population% of 603 Area% of County
Hillsborough County430,44247.1%49%
Strafford County134,33118.1%60%
Merrimack County157,54712.0%34%
Sullivan County43,9246.4%65%
Cheshire County78,1685.2%30%
Rockingham County322,0015.2%7%
Belknap County65,1693.9%26%
Coos County31,3772.1%30%

☎️Area Code 603 Exchange Prefixes & Carriers

Showing 50 of 768 central office 3-digit prefixes and assigned telecom carriers

78% Landline21% Wireless2% VoIP
PrefixLine UsageRate CenterAssigned CarrierAssign Date
(603) 200-📞LandlineNEWMARKETCOMCAST IP PHONE, LLC08/16/2011
(603) 201-📞LandlineXXXXXXXXXXCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 202-📞LandlineCONCORDOMNIPOINT MIAMI E LICENSE, LLC01/13/2023
(603) 203-📱WirelessMANCHESTERNEW CINGULAR WIRELESS PCS, LLC - DC05/14/2003
(603) 204-📱WirelessNASHUAUNITED STATES CELLULAR - NHN/A
(603) 205-📞LandlinePORTSMOUTHOMNIPOINT MIAMI E LICENSE, LLCN/A
(603) 206-📞LandlineMANCHESTERPAETEC ITEL, LLCN/A
(603) 207-💻VoIPDERRYONVOY, LLC - NH09/13/2022
(603) 208-📱WirelessLYMEUNITED STATES CELLULAR - NHN/A
(603) 209-📱WirelessKEENEUNITED STATES CELLULAR - NHN/A
(603) 210-📞LandlineSUNCOOKCOMCAST IP PHONE, LLCN/A
(603) 211-📞LandlineXXXXXXXXXXMULTIPLE OCN LISTINGN/A
(603) 212-📞LandlineSALEMCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 213-📞LandlineMILFORDCOMCAST IP PHONE, LLC11/08/2012
(603) 214-📞LandlineERROLFREEDOM RING COMMUNICATIONS, LLCN/A
(603) 215-📞LandlineBERLINFREEDOM RING COMMUNICATIONS, LLCN/A
(603) 216-📞LandlineDERRYCOMCAST IP PHONE, LLCN/A
(603) 217-📱WirelessBRISTOLBELL ATLANTIC MOBILE, INC07/11/2001
(603) 218-📞LandlineMANCHESTERPAETEC ITEL, LLCN/A
(603) 219-📞LandlineCONCORDOMNIPOINT MIAMI E LICENSE, LLC02/14/2001
(603) 220-📞LandlineXXXXXXXXXXLocal Exchange CarrierN/A
(603) 221-📞LandlineNASHUACONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 222-📞LandlineMANCHESTERCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 223-📞LandlineCONCORDCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 224-📞LandlineCONCORDCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 225-📞LandlineCONCORDCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 226-📞LandlineCONCORDCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 227-📞LandlineCONCORDCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 228-📞LandlineCONCORDCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 229-📞LandlineCONCORDCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 230-📞LandlineCONCORDCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 231-📞LandlineDERRYOMNIPOINT MIAMI E LICENSE, LLC05/03/2001
(603) 232-📞LandlineMANCHESTERCOMCAST IP PHONE, LLCN/A
(603) 233-📞LandlineNASHUAOMNIPOINT MIAMI E LICENSE, LLCN/A
(603) 234-📞LandlineDERRYOMNIPOINT MIAMI E LICENSE, LLC05/03/2001
(603) 235-📞LandlineDERRYOMNIPOINT MIAMI E LICENSE, LLC05/03/2001
(603) 236-📞LandlineCAMPTONCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 237-📞LandlineCOLEBROOKCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 238-📞LandlinePLYMOUTHPAETEC ITEL, LLCN/A
(603) 239-📞LandlineWINCHESTERCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 240-📞LandlineMANCHESTERCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 241-📱WirelessDOVERNEW CINGULAR WIRELESS PCS, LLC - DC03/21/2022
(603) 242-📞LandlineTROYCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 243-📞LandlineWOODSVILLECHARTER IP ENABLED SERVICES, LLC07/20/2011
(603) 244-📞LandlineRAYMONDCOMCAST IP PHONE, LLCN/A
(603) 245-📞LandlinePORTSMOUTHCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 246-📞LandlineWSTEWATSTNCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 247-📱WirelessDERRYNEW CINGULAR WIRELESS PCS, LLC - DCN/A
(603) 248-📞LandlineDOVERCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A
(603) 249-📞LandlineMILFORDCONSOLIDATED COMM OF NO. NEW ENGLAND-NHN/A

Frequently Asked Questions about Area Code 603

Where is area code 603 located?

Area code 603 is located in New Hampshire (United States), serving cities like Manchester, Nashua, Concord, Dover, Rochester, Keene, Portsmouth, Laconia, Lebanon, Claremont.

What timezone is area code 603?

Area code 603 operates in the Eastern timezone.

What state is area code 603?

Area code 603 is assigned to the state / telecom territory of New Hampshire.

Is area code 603 a scam or dangerous?

Area code 603 is an official geographic area code for New Hampshire. However, beware of robocaller spoofing.

New Hampshire State Area Codes

View complete directory of telephone area codes assigned to New Hampshire.

Explore New Hampshire Directory

Get a 603 Business Phone Number

How to acquire a virtual phone number or business line with area code 603 for local customer trust in New Hampshire.

Get 603 Business Number
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