Lookup › Area code 203
203 Area Code — New Haven, Connecticut
Area code 203 serves New Haven, CT.
Most looked-up 203 numbers
- 203-576-2134
- 203-402-8757
- 203-803-9313
- 203-558-6046
- 203-536-2378
- 203-217-9122
- 203-663-3726
- 203-554-0322
- 203-641-2060
- 203-576-6913
- 203-641-2185
- 203-338-5024
Phone prefixes in 203
- 203-820
- 203-338
- 203-803
- 203-663
- 203-536
- 203-576
- 203-554
- 203-558
- 203-217
- 203-641
- 203-864
- 203-212
- 203-545
- 203-526
- 203-243
- 203-587
- 203-298
- 203-727
- 203-605
- 203-643
- 203-836
- 203-402
- 203-628
Carriers serving 203
- T-Mobile (8 numbers)
- Verizon (8 numbers)
- At&t (2 numbers)
- Twilio (2 numbers)
- Bandwidth (2 numbers)
- Ip Horizon, LLC (1 numbers)
- Level 3 Communications, LLC - (1 numbers)
- Csc Wireless, LLC (1 numbers)
- Cablevision Lightpath, Inc. - (1 numbers)
- Southern New England Telco Dba (1 numbers)
Frequently asked questions
Where is area code 203?
Area code 203 serves New Haven, CT.
What prefixes are in area code 203?
Phone2.io tracks 23 phone prefixes in area code 203, with carrier and spam-report data on individual numbers.
More about area code 203
Area code 203 overview, history, and local numbers · Get a CT phone number
Last updated: January 19, 2026