203 Area Code — Connecticut
203 is a North American Numbering Plan area code for Connecticut, the United States. It covers about 1,841,975 people in 62 towns and 161 ZIP codes, including New Haven, Bridgeport and Stamford.
| Field | Value |
|---|---|
| Area code | 203 |
| Country | United States (+1) |
| State / province | Connecticut |
| Type | Shares its towns with 475 |
| Time zone | Eastern |
| Population covered | 1,841,975 |
| Towns covered | 62 |
| ZIP codes | 161 |
| Approx. centre | 41.297, -73.183 |
Where area code 203 is used
Area code 203 is assigned to Connecticut, the United States, inside the North American Numbering Plan. Numbers in the code are written (203) NXX-XXXX at home and +1 203 NXX-XXXX when dialled from outside Canada and the United States. Since the NANP moved to 10-digit dialling you must always include the area code, even for a local call.
Other area codes in this footprint: 475. They serve towns in the same territory, so a single street can contain numbers from more than one code. That is normal in the NANP and does not change how you dial.
Towns and cities in area code 203
The 62 towns below are the largest in the 203 footprint, ranked by population. Every one of them links to its own page with the full list of area codes and ZIP codes for that town.
| Town | County | Population | ZIP codes |
|---|---|---|---|
| New Haven | New Haven County | 170,716 | 28 |
| Bridgeport | Fairfield County | 149,153 | 10 |
| Stamford | Fairfield County | 137,068 | 17 |
| Waterbury | New Haven County | 115,012 | 16 |
| Norwalk | Fairfield County | 92,197 | 10 |
| Danbury | Fairfield County | 87,061 | 6 |
| Hamden | New Haven County | 61,150 | 3 |
| Meriden | New Haven County | 60,545 | 2 |
| Fairfield | Fairfield County | 58,698 | 3 |
| West Haven | New Haven County | 55,351 | 1 |
| Stratford | Fairfield County | 52,790 | 2 |
| Milford | New Haven County | 52,684 | 2 |
Counties covered
| County | ZIP codes |
|---|---|
| Fairfield County | 82 |
| New Haven County | 78 |
| Litchfield County | 1 |
Other area codes serving the same towns
Nearby area codes
How to dial area code 203
- Within North America: 203 + 7-digit number (203-NXX-XXXX). The leading 1 is optional on a mobile phone and required on most landlines for long-distance.
- From abroad: your country's international prefix, then 1, then 203, then the 7-digit number — for example 00 1 203 NXX-XXXX from most of Europe.
Frequently asked questions
What area code is 203?
203 is a North American Numbering Plan area code assigned to Connecticut, the United States. It covers about 1,841,975 people in 62 towns.
Is 203 a US or Canadian area code?
203 is a United States area code. Canada and the United States share the +1 country code, so both are part of the same numbering plan.
What time zone is area code 203 in?
Area code 203 is in the Eastern time zone.
Do I have to dial 10 digits?
Yes. Every NANP call now requires the area code plus the seven-digit number, even for a local call.