Where is the 631 area code?

Area code 631 covers Bridgeport in Connecticut, on Eastern Time.

What time zone is area code 631 in?

Numbers in the 631 area code sit in Eastern Time.

Is 631 a toll-free or scam area code?

No. 631 is a geographic North American Numbering Plan area code assigned to Connecticut. Toll-free numbers use 800, 833, 844, 855, 866, 877 and 888. A call from 631 can still be spoofed, so treat unexpected calls with the usual caution.

Area code lookup

631 area code

Where the 631 area code is, which cities and counties it serves, the local time zone and the overlay codes dialled alongside it.

State: CT
Cities covered: 1
Counties: 1
Time zone: Eastern Time

Quick answer

Area code 631 serves Bridgeport in Connecticut. It sits in Eastern Time and covers 1 county and about 7 ZIP codes across the metros we track. Numbers there are also dialled as 203.

Cities in the 631 area code

Each city links to its full local profile: sales tax, housing, income and ZIP codes.

City	County	Time zone	ZIP codes
Bridgeport, CT	Fairfield County	EST/EDT	7

Related area codes

Codes that share or border the same calling area.

631 area code FAQ

The questions people ask about this code.

Where is area code 631?

631 is a geographic area code in Connecticut, covering Bridgeport.

What time is it in the 631 area code?

631 observes Eastern Time (EST/EDT).

Is 631 a scam area code?

No — it is a normal geographic code, not a toll-free or premium-rate prefix. Caller ID can be spoofed on any code, so verify unexpected callers before sharing information.

Sources & transparency

North American Numbering Plan Administrator (NANPA) area code assignments — area code to geography mapping and overlay relationships
US Census Bureau, American Community Survey 2019-2023 5-year estimates — city, county and ZIP code geography

Last reviewed August 2026. Figures are published for reference and can change; verify with the source agency before filing or contracting. How we build and check this data.