Cities in area code 203
Which places use area code 203? 32 rate centers in Connecticut, the biggest being New Haven, Stamford, Bridgeport. Data below is NANPA's official prefix-to-rate-center mapping.
Ranked by active prefixes, the code's territory runs through New Haven, Stamford, Bridgeport, Norwalk, Danbury, Waterbury, Greenwich and Meriden, and 23 smaller communities down to single-prefix localities.
32 of the localities fall within FCC top-100 metropolitan statistical areas; the rest are smaller communities.
32 of these localities are also reachable through other area codes — overlay territory where the same place answers to several codes.
All of the code's territory keeps Eastern time.
Remember that people keep numbers when they relocate, so a 203 number is a where-it-was-issued fact, not a where-they-are fact.
| Locality (rate center) | Active prefixes | Metro area | All codes serving it |
|---|---|---|---|
| New Haven | 145 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Stamford | 97 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Bridgeport | 94 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Norwalk | 60 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Danbury | 54 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Waterbury | 52 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Greenwich | 27 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Meriden | 24 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Ansonia-derby | 17 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Westport | 16 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Darien | 15 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Fairfield | 15 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Huntington | 14 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Wallingford | 14 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Milford | 14 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Trumbull | 13 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Branford | 10 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Cheshire | 10 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Old Greenwich | 9 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| New Canaan | 9 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Guilford | 8 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Wilton | 8 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Woodbury | 8 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Byram | 8 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Madison | 6 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Naugatuck | 6 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Ridgefield | 5 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Newtown | 5 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Seymour | 5 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Wolcott | 4 | (New Haven-Milford, CT Metropolitan Statistical Area) | 203, 475 |
| Redding | 3 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
| Georgetown | 3 | Bridgeport-Stamford-Norwalk, CT | 203, 475 |
FAQ
What is the biggest city in area code 203?
New Haven holds the most active prefixes (145), making it the code's largest numbering locality.
How many places does 203 cover?
32 rate centers in Connecticut hold active 203 prefixes, from New Haven down to communities with a single prefix.
Does a 203 number guarantee the caller lives in one of these places?
No — the tables show where number blocks were issued. Porting and VoIP let people keep or acquire numbers anywhere.