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Area Code 203 Location & Details

State / Region: Connecticut • Country: United States

Major Cities Covered: Bridgeport, Stamford, New Haven, Waterbury, Norwalk, Danbury, Meriden, West Haven, Milford City (balance), Shelton

Standard Dial Format
+1 (203) XXX-XXXX
Country Code: +1 (NANP Format)
What State is Area Code 203?
ConnecticutState Hub →
Country Territory
United States
203 Area Code Time Zone
Eastern
203 Overlay Codes
475

Area Code 203 Geographic Map

Interactive location bounds and coverage area for Connecticut (Eastern Timezone)

Lat: 41.32° • Lng: -73.14°
📍 Geographic Center: ConnecticutMap data © OpenStreetMap contributors

Where is Area Code 203 Located?

Telephone area code 203 is assigned to Connecticut in United States. It serves cities and metropolitan communities including Bridgeport, Stamford, New Haven, Waterbury, Norwalk, Danbury, Meriden, West Haven, Milford City (balance), Shelton.

Historical Context & Area Code Overlay Information:203 serves Connecticut (United States).

For local and long-distance calls within area code 203, standard 10-digit dialing (203) XXX-XXXX applies.

Who Called Me from Area Code 203?

Received an unknown call, missed call, or text scam from area code 203? Here is how to trace who is calling from 203 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 203 prefix to boost pick-up rates.

3.
Reverse Phone Lookup Area Code 203:

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

Learn How Reverse Phone Lookups Work→

How to Call Area Code 203 & Dialing Format

When placing a phone call to a number in area code 203, follow the correct dialing format depending on your calling location:

  • Calling from inside the US / Canada (+1): Dial 1 + (203) + 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 + 203 + 7-digit number.
  • Do I need to dial area code 203 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 203

Urban centers, census places, and communities within the +1-203 calling area

15 Major Cities Listed
City NameCountyPopulation% of 203 Pop
BridgeportGreater Bridgeport Planning Region152,27315.1%
StamfordWestern Connecticut Planning Region139,53513.8%
New HavenSouth Central Connecticut Planning Region138,77413.8%
WaterburyNaugatuck Valley Planning Region115,77111.5%
NorwalkWestern Connecticut Planning Region94,5089.4%
DanburyWestern Connecticut Planning Region89,0338.8%
MeridenSouth Central Connecticut Planning Region60,8106.0%
West HavenSouth Central Connecticut Planning Region55,3515.5%
Milford City (balance)Greater Bridgeport Planning Region51,2155.1%
SheltonGreater Bridgeport Planning Region42,8804.3%
NaugatuckNaugatuck Valley Planning Region32,2303.2%
AnsoniaNaugatuck Valley Planning Region19,2161.9%
DerbyGreater Bridgeport Planning Region12,9251.3%
WoodmontSouth Central Connecticut Planning Region2,3910.2%
NewtownWestern Connecticut Planning Region1,9800.2%

Counties Covered by Area Code 203

Geographic county distribution and population coverage across Connecticut

County NameTotal Population% of 203 Area% of County
Western Connecticut Planning Region637,72132.2%51%
Greater Bridgeport Planning Region336,39125.7%77%
South Central Connecticut Planning Region577,53825.5%45%
Naugatuck Valley Planning Region461,48016.6%36%

☎️Area Code 203 Exchange Prefixes & Carriers

Showing 50 of 800 central office 3-digit prefixes and assigned telecom carriers

81% Landline17% Wireless2% VoIP
PrefixLine UsageRate CenterAssigned CarrierAssign Date
(203) 200-💻VoIPNEW HAVENBANDWIDTH.COM CLEC, LLC - CT08/14/2008
(203) 201-📞LandlineNEW HAVENSPOK, INC.N/A
(203) 202-📞LandlineDARIENCABLEVISION LIGHTPATH, INC. - CTN/A
(203) 203-💻VoIPGREENWICHONVOY, LLC - CT09/18/2024
(203) 204-📞LandlineGUILFORDTELEPORT COMMUNICATIONS AMERICA, LLC - CTN/A
(203) 205-📞LandlineDANBURYSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 206-📱WirelessWATERBURYNEW CINGULAR WIRELESS PCS, LLC - DCN/A
(203) 207-📞LandlineDANBURYSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 208-📞LandlineBRANFORDCOMCAST IP PHONE, LLCN/A
(203) 209-📱WirelessBRIDGEPORTCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CTN/A
(203) 210-📞LandlineWILTONCABLEVISION LIGHTPATH, INC. - CTN/A
(203) 211-📞LandlineXXXXXXXXXXMULTIPLE OCN LISTINGN/A
(203) 212-📱WirelessBRIDGEPORTNEW CINGULAR WIRELESS PCS, LLC - DC10/23/2008
(203) 213-📱WirelessMERIDENNEW CINGULAR WIRELESS PCS, LLC - DCN/A
(203) 214-📱WirelessNEW HAVENNEW CINGULAR WIRELESS PCS, LLC - DCN/A
(203) 215-📱WirelessNEW HAVENNEW CINGULAR WIRELESS PCS, LLC - DCN/A
(203) 216-📱WirelessWESTPORTNEW CINGULAR WIRELESS PCS, LLC - DCN/A
(203) 217-📱WirelessWATERBURYNEW CINGULAR WIRELESS PCS, LLC - DCN/A
(203) 218-📱WirelessBRIDGEPORTNEW CINGULAR WIRELESS PCS, LLC - DCN/A
(203) 219-📱WirelessSTAMFORDNEW CINGULAR WIRELESS PCS, LLC - DCN/A
(203) 220-📞LandlineTRUMBULLCABLEVISION LIGHTPATH, INC. - CTN/A
(203) 221-📞LandlineWESTPORTSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 222-📞LandlineWESTPORTSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 223-📞LandlineSTAMFORDOMNIPOINT COMMUNICATIONS, INC. - CTN/A
(203) 224-📞LandlineBRIDGEPORTSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 225-📞LandlineHUNTINGTONSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 226-📞LandlineWESTPORTSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 227-📞LandlineWESTPORTSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 228-📱WirelessWATERBURYCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT10/04/2002
(203) 229-📞LandlineNORWALKSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 230-📞LandlineNEW HAVENSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 231-📱WirelessANSONIDRBYCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CTN/A
(203) 232-📱WirelessWATERBURYCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CTN/A
(203) 233-📱WirelessWATERBURYCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CTN/A
(203) 234-📞LandlineNEW HAVENSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 235-📞LandlineMERIDENSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 236-📞LandlineWATERBURYSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 237-📞LandlineMERIDENSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 238-📞LandlineMERIDENSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 239-📞LandlineNEW HAVENSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 240-📱WirelessDANBURYCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CTN/A
(203) 241-📱WirelessDANBURYCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CTN/A
(203) 242-📞LandlineHUNTINGTONCABLEVISION LIGHTPATH, INC. - CTN/A
(203) 243-📞LandlineBRIDGEPORTOMNIPOINT COMMUNICATIONS, INC. - CTN/A
(203) 244-📞LandlineRIDGEFIELDCSC VOICE, LLC03/28/2003
(203) 245-📞LandlineMADISONSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 246-📱WirelessNORWALKCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CTN/A
(203) 247-📱WirelessNORWALKCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CTN/A
(203) 248-📞LandlineNEW HAVENSOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CTN/A
(203) 249-📱WirelessSTAMFORDCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CTN/A

Frequently Asked Questions about Area Code 203

Where is area code 203 located?

Area code 203 is located in Connecticut (United States), serving cities like Bridgeport, Stamford, New Haven, Waterbury, Norwalk, Danbury, Meriden, West Haven, Milford City (balance), Shelton.

What timezone is area code 203?

Area code 203 operates in the Eastern timezone.

What state is area code 203?

Area code 203 is assigned to the state / telecom territory of Connecticut.

Is area code 203 a scam or dangerous?

Area code 203 is an official geographic area code for Connecticut. However, beware of robocaller spoofing.

Connecticut State Area Codes

View complete directory of telephone area codes assigned to Connecticut.

Explore Connecticut Directory

Get a 203 Business Phone Number

How to acquire a virtual phone number or business line with area code 203 for local customer trust in Connecticut.

Get 203 Business Number
🛡️ Scam & Safety Directory

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Overlay & Nearby Area Codes for Connecticut

Explore neighboring telecom prefixes sharing geographical boundaries with area code 203.

475
Eastern
Area Code 475
Bridgeport, Stamford, New Haven, Waterbury, Norwalk, Danbury, Meriden, West Haven, Milford City (balance), Shelton
860
Eastern
Area Code 860
Hartford, New Britain, Bristol, Middletown, Norwich, Torrington, New London, Groton, Danielson, Jewett City
959
Eastern
Area Code 959
Hartford, New Britain, Bristol, Middletown, Norwich, Torrington, New London, Groton, Danielson, Jewett City