🇺🇸 United States · Connecticut

Area code 203

Area code 203 is a telephone area code in Connecticut, United States, covering New Haven, Norwalk, Stamford, Bridgeport, Greenwich, Waterbury and more. Local time is UTC−5 (UTC−4 in summer). Numbers look like (203) 234-5678, or +1 203 234 5678 from abroad.

State: Connecticut
Time zone: New York UTC−5 (UTC−4 in summer)
Local time now: –
Dial from abroad: +1 203

Places in area code 203

Cities and towns with telephone exchanges in the 203 area code, most exchanges first.

New Haven
Norwalk
Stamford
Bridgeport
Greenwich
Waterbury
Milford
Shelton
Meriden
Westport
Stratford
Danbury
Hamden
Fairfield
Wallingford
Branford
Wilton
Cheshire
West Haven
Darien
Southbury
Newtown
East Haven
New Canaan

How to dial area code 203

Calling from	You dial
Inside the 203 area	203 234 5678 (10 digits)
Elsewhere in the US & Canada	1 203 234 5678
Any mobile phone, anywhere	+1 203 234 5678
UK, Europe, India and most countries	00 1 203 234 5678
Australia	0011 1 203 234 5678

Other area codes in Connecticut

475 Connecticut 860 Hartford, West Hartford 959 Connecticut

Area code 203: FAQ

Where is area code 203?

Area code 203 is in Connecticut, United States and serves New Haven, Norwalk, Stamford, Bridgeport, Greenwich, Waterbury. and other places

What time zone is area code 203 in?

Area code 203 is in the America/New_York time zone (UTC−5 (UTC−4 in summer)).

How do I call a 203 number from outside the US and Canada?

Dial your exit code (00 in most countries, or + on a mobile), then 1, then 203 and the seven-digit number. Example: +1 203 234 5678.

Is a call from area code 203 a scam?

Area code 203 is a regular North American area code, but caller ID can be spoofed: scammers often show local-looking numbers. Do not call back unknown numbers that ask for money or personal data, and check the number with the phone number validator to see whether it is valid and whether it is a mobile, landline or VoIP number.

Phone number API

Check 203 numbers in your app

numlookupapi checks any phone number worldwide in one request and returns validity, line type, carrier, location and every standard format as JSON.

Read the documentation

100 free requests every month. No credit card required.

GET https://api.numlookupapi.com/v1/validate/+12032345678

{
  "valid": true,
  "number": "12069220880",
  "local_format": "2069220880",
  "international_format": "+12069220880",
  "country_prefix": "+1",
  "country_code": "US",
  "country_name": "United States of America",
  "location": "Seattle",
  "line_type": "landline",
  "e164_format": "+12069220880",
  "national_format": "(206) 922-0880"
}