What area code is 203?
Here's everything about it.
Instant lookup for the 203 area code — location, time zone, cities served, and who's been calling from it. No sign-up, no app.
203 at a glance
Summary
Cities & regions served by 203
New Haven / Bridgeport4 communities on record for 203.
Where 203 sits on the map
Overlay: 475Coverage area
About the 203 region
203 covers New Haven / Bridgeport in Connecticut, including Danbury and Waterbury. The code has been in service since 1947 and is one of the original North American area codes.
As the New Haven / Bridgeport region grew, 203 ran low on available numbers, so 475 was added as an overlay code over the same geographic area. Both codes are local to each other and 10-digit dialing applies throughout.
Created for all of Connecticut; 1995: split to create 860; 2009: overlaid by 475.
Who called me from 203?
Community reports- Caller ID is trivially spoofed: an incoming call that displays 203 does not prove the caller is really in the 203 region or even in the United States.
- Avoid calling back unknown one-ring numbers — some premium-rate scams rely on curiosity callbacks.
- Never share verification codes, payment details, or remote access during an unsolicited call, even if the caller claims to be your bank or a government agency.
- When a 203 call pressures you to act immediately, hang up and contact the organization directly through its official number.
Be the first to add a community report for a 203 number below.
Frequently asked questions
FAQWhat area code is 203?+–
203 is a telephone area code serving New Haven / Bridgeport in Connecticut, United States, in service since 1947.
Where is area code 203 located?+–
It covers Fairfield County, New Haven County, Litchfield County, including Danbury and Waterbury in Connecticut.
What cities are in area code 203?+–
Major communities on record include Danbury and Waterbury. The code's territory spans the New Haven / Bridgeport region of Connecticut.
What time zone is 203?+–
203 observes Eastern (ET), which is UTC−5 / −4 DST and follows daylight saving time.
When did area code 203 start?+–
203 entered service in 1947 as one of the original 1947 North American area codes. Its history: created for all of Connecticut; 1995: split to create 860; 2009: overlaid by 475.
Why do calls to 203 require 10-digit dialing?+–
203 shares its territory with overlay code 475. Because both codes serve the same geographic area, the phone network needs all 10 digits to route a call, and calls between the codes are still local.
Is 203 a scam area code?+–
Scam and robocall traffic can use any North American code, 203 included — caller ID is easy to spoof, so the code alone does not tell you who is really calling. Check the community reports on this page before calling back an unknown 203 number, and report anything suspicious.
Can I get a 203 phone number?+–
Yes — most mobile carriers and VoIP providers let you request a 203 number regardless of where you physically live.