203 area code
Bridgeport area, Eastern Time.Area code 203 covers Bridgeport, New Haven, Stamford and 29 more places in Connecticut, on Eastern Time. 475 covers the same area.
Right now in Bridgeport
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer)
Calling hours: Every day, 9 AM to 8 PM (Connecticut law)
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Where 203 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 203 has 32. Each one's share is how many 203 numbers start there. Its biggest metro area is Bridgeport-Stamford-Norwalk, CT.
- New Haven19%
- Stamford12%
- Bridgeport12%
- Norwalk8%
- Danbury7%
- Waterbury7%
- Greenwich3%
- Meriden3%
- Ansonia-Derby2%
- Westport2%
Also: Fairfield, Darien, Huntington, Milford, Wallingford, Trumbull, Branford, Cheshire, New Canaan, Old Greenwich, Byram, Woodbury + 10 more
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 203 number?
Sales calls to homes and cell phones have legal hours, set by Connecticut law. Hold every 203 number to them, since you can't tell a work line from a personal cell.
What applies to 203Every day, 9 AM to 8 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
- Connecticut lawEvery day, 9 AM to 8 PMCalls to businesses are excluded.Conn. Gen. Stat. 42-288a(c) (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
203 and 475
203 is one of the original area codes from 1947, and 860 was later split off from it. 203 and 475 cover the same area, so new numbers can get either code and neighbors can have different area codes. 203 holds 73% of the area's exchanges; 475 holds the rest. Local calls take all 10 digits.
- 1947203 starts
- 1995860 split off
- 2009475 overlay
Source: NANPA area code database
Other Connecticut area codes
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203 area code FAQ
What area code is 203?
203 is a Connecticut area code for Bridgeport, New Haven, Stamford, Norwalk and 28 more places.
What time zone is the 203 area code in?
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer).
Is 475 the same as 203?
Same area, different code. 203 and 475 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 203 numbers?
Every day, 9 AM to 8 PM, local time, under Connecticut law.
When did the 203 area code start?
In 1947: it's one of the original area codes.
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