203 Area Code — New Haven, Connecticut

Area code 203 serves New Haven, CT.

Most looked-up 203 numbers

• 203-576-2134
• 203-338-5024
• 203-803-9313
• 203-663-3726
• 203-558-6046
• 203-536-2378
• 203-217-9122
• 203-820-8930
• 203-554-0322

Phone prefixes in 203

• 203-820
• 203-338
• 203-803
• 203-663
• 203-536
• 203-576
• 203-554
• 203-558
• 203-217

Carriers serving 203

• Verizon (2 numbers)
• T-Mobile (2 numbers)
• At&t (2 numbers)
• Bandwidth (1 numbers)
• Level 3 Communications, LLC - (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 9 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