The 475 area code is an overlay serving southwestern Connecticut, including Fairfield and New Haven counties. Introduced in 2009, it was layered directly on top of the established 203 area code to supply fresh phone numbers across the state’s most populous region.
Quick Summary of the 475 Area Code
| Area Code | 475 |
| State | Connecticut (CT) |
| Region | Southwestern Connecticut (Fairfield & New Haven Counties) |
| Major Cities | Bridgeport, New Haven, Stamford, Norwalk, Danbury, Waterbury, Greenwich, Milford |
| Time Zone | Eastern Time (ET) – EST / EDT |
| Dialing Format | 10-digit dialing required |
Geographic Coverage
The 475 area code shares an identical footprint with 203, covering the Fairfield County cities of Stamford, Norwalk, Greenwich, Bridgeport, Danbury, and Milford, and the New Haven County cities of New Haven and Waterbury. Because it is an overlay rather than a separate region, a 475 number and a 203 number can exist on the same street.
Time Zone
The 475 area code observes Eastern Time (ET). Clocks follow Eastern Standard Time (UTC−5) in winter and shift to Eastern Daylight Time (UTC−4) from mid-March through early November. All of Connecticut is on Eastern Time. From the West Coast, this region is three hours ahead of Pacific Time, so a 9:00 AM call in California reaches a 475 number at 12:00 PM local time.
Tip: Business hours across the 475 region generally run 9:00 AM to 5:00 PM Eastern Time, Monday through Friday.
How to Dial a 475 Number
Because area code 475 operates as part of an overlay, 10-digit dialing is mandatory for every local and long-distance call. You must dial the full 10-digit number (475 + the seven-digit line number) even when calling a neighbor across the street. For international callers, dial your country’s exit code, then +1 (the North American country code), then 475, followed by the seven-digit local number.
Scam Alerts for the 475 Area Code
Like every U.S. area code, 475 has been used by scammers who spoof local numbers to appear trustworthy. Residents in Bridgeport, New Haven, Stamford, Norwalk, Danbury, Waterbury, Greenwich, Milford should stay alert to the following common tactics:
| Scam Type | What to Watch For |
|---|---|
| IRS / Tax Scams | Threatening calls demanding immediate tax payment via gift cards or wire transfer. |
| Utility Shut-off | Impostors claiming to be Eversource threatening to cut power. |
| Tech Support Fraud | Pop-ups or calls claiming your computer is infected and asking for remote access. |
| Prize / Lottery Scam | Calls saying you won a prize but must pay a “fee” or “tax” to claim it. |
If you receive a suspicious call from a 475 number, take these steps to protect yourself:
- Do not share personal information such as Social Security numbers, bank details, or passwords over the phone.
- Hang up and verify by calling the organization back using an official number from its website.
- Report the call to the FTC at reportfraud.ftc.gov and to the Connecticut Department of Consumer Protection.
- Block the number and consider registering with the National Do Not Call Registry.
Red Flag: Legitimate agencies such as the IRS, Social Security Administration, or your local utility company (Eversource or United Illuminating) will never demand immediate payment by gift card, wire transfer, or cryptocurrency. Any 475 caller making such a demand is a scammer.
History and Economy of the 475 Region
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The 475 area code entered service in 2009 as an overlay for the entire 203 region. Overlays let regulators add a fresh supply of phone numbers to a crowded area without forcing existing customers to change their established numbers, so 475 covers precisely the same cities as 203. The regional economy is one of the wealthiest in the country, anchored by finance, hedge funds, and corporate headquarters in the Stamford and Greenwich area within commuting distance of New York City, Yale University and a growing biotech sector in New Haven, and a manufacturing heritage in Bridgeport and Waterbury. Because 475 is the newer of the two southwestern codes, it appears most often on recently activated mobile numbers and new business lines.
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Looking Up a 475 Number
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To identify a 475 caller, use a reverse phone lookup or search the complete 10-digit number online. Because 475 is a newer code often used for mobile numbers, some callers may have a smaller public footprint, so never share personal or financial details with an unverified caller.
Nearby & Related Area Codes
Connecticut is served by five area codes. If you are researching 475, these neighboring and overlay codes are worth knowing:
- 203 – Southwestern CT (overlay partner)
- 860 – Northern & Eastern CT / Hartford
- 959 – Hartford area overlay
- 428 – Statewide Connecticut overlay
You can also browse our full directory of Connecticut area codes for more regional guides.
↑ See the complete list of All US Area Codes by State – every area code across all 50 states in one directory.
Explore Neighboring States
Researching area codes just across the state line? Start with these codes in the states that border Connecticut:
Frequently Asked Questions
Where is the 475 area code located?
The 475 area code serves southwestern Connecticut as an overlay of 203, covering Bridgeport, New Haven, Stamford, Norwalk, Danbury, Waterbury, and Greenwich.
Why does 475 cover the same area as 203?
475 is an overlay added in 2009 because the 203 region ran short of available phone numbers. Both codes serve the exact same geographic area.
Do I have to dial 10 digits for 475?
Yes. Overlay area codes like 475 always require 10-digit dialing for local calls.
Is the 475 area code Eastern Time?
Yes, the 475 area code follows Eastern Time (EST/EDT), like all of Connecticut.
Related 475 Guides
- Is a 475 call safe? Read Is area code 475 a scam? Spam & safety guide.
- Local coverage: see the New Haven area code guide.
- Worried about spam or robocalls? Browse our Scam Alerts directory.