Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — AREA-CODE/475

475 area code

Area code 475 is in Connecticut. It covers Bridgeport, Stamford, New Haven and 122 other places: 161 ZIP codes in Fairfield, New Haven and Litchfield counties. Local time there is , Eastern Time. In service since 2009 as an overlay: it covers the same area as 203, so a number from there can have either code.

Time zone
Eastern
Largest city
New Haven
Overlays
203
In service since
2009
Rate centres
32
Prefixes assigned
291 (2,910,000 numbers)

Who calls from a 475 number

NANPA records the carrier each block of 475 numbers is assigned to. Of the 2.8 million 475 numbers assigned, 59% are with cable, internet-calling, business and other carriers (Onvoy, Bandwidth and Peerless Network Of Connecticut); 39% with mobile carriers (Verizon Wireless, T-Mobile and AT&T Mobility); 2% with local phone companies.

That is who the numbers were assigned to: people keep their number when they change carrier, so any one number may have moved since.

Carriers holding the most 475 numbers
CarrierKindShare
OnvoyCable, VoIP, other31%
Verizon WirelessMobile17%
T-MobileMobile12%
BandwidthCable, VoIP, other8%
AT&T MobilityMobile8%
Peerless Network Of ConnecticutCable, VoIP, other4%

An area code says where a number was issued, not where the caller is: people keep their numbers when they move, and caller ID can be set to show any number, which the FCC calls spoofing. If a call you did not expect asks for money or personal details, the FCC advises hanging up and calling the company back on a number you look up yourself. Unwanted calls can be reported to the FTC at ReportFraud.ftc.gov.

Places in area code 475

The 30 places with a telephone rate centre of their own using 475, largest first. Each links to its ZIP codes.

Places in area code 475
PlaceZIP codesPopulation
Bridgeport, CT 10 149,153
Stamford, CT 17 137,144
New Haven, CT 28 134,349
Waterbury, CT 16 114,869
Norwalk, CT 10 92,187
Danbury, CT 6 87,263
Meriden, CT 2 60,545
Fairfield, CT 3 58,698
Milford, CT 2 51,023
Wallingford, CT 4 44,498
Trumbull, CT 1 37,281
Naugatuck, CT 1 31,800
Cheshire, CT 3 28,904
Branford, CT 1 28,217
Westport, CT 4 27,583
Guilford, CT 1 22,067
Darien, CT 1 21,936
Wilton, CT 1 18,777
Madison, CT 1 17,657
Seymour, CT 1 16,889
Wolcott, CT 1 16,113
Greenwich, CT 3 14,792
Woodbury, CT 1 9,833
Redding, CT 1 8,779
Ridgefield, CT 2 6,970
Old Greenwich, CT 1 6,936
New Canaan, CT 1 6,896
Byram, CT — 4,633
Georgetown, CT 1 1,932
Newtown, CT 1 1,898

Nearby places using 475

These places have no rate centre of their own in NANPA's records; the nearest one uses 475. Near an area-code boundary that can be wrong for part of a town.

ZIP codes in area code 475

161 ZIP codes in 62 towns, by the town each is mailed to, largest first. Each links to its own page.

Where 475 numbers are issued

NANPA's rate centres with the most 475 prefixes (each prefix is 10,000 numbers), under NANPA's own abbreviated names.

Rate centres using area code 475
Rate centrePlacePrefixes
NEW HAVEN New Haven 43
STAMFORD Stamford 27
BRIDGEPORT Bridgeport 25
NORWALK Norwalk 22
ANSONIDRBY — 19
DANBURY Danbury 18

Counties

The counties of its ZIP codes, most residents first, with how many of its ZIP codes each has.

Which code covers where you are now? What area code am I in? answers from your location.

Questions about area code 475

Where is area code 475?

Area code 475 is in Connecticut. It covers Bridgeport, Stamford, New Haven and 122 other places: 161 ZIP codes in Fairfield, New Haven and Litchfield counties.

What ZIP codes are in area code 475?

161 ZIP codes, by the town each is mailed to: Bridgeport (10, 06601 to 06699), Stamford (17, 06901 to 06927), New Haven (28, 06501 to 06540), Waterbury (16, 06701 to 06749) and 58 more towns. The full list is on this page.

What time zone is area code 475 in?

Eastern time.

Is a 475 number a mobile or a landline?

It can be either. 39% of 475 numbers are assigned to mobile carriers and 2% to local phone companies (NANPA, 2026-10-10); the rest are with cable, internet-calling, business and paging carriers. A number keeps its area code when it moves to another carrier.

What area codes overlay 475?

203. They cover the same area as 475, so a new number there can be given any of them.

Does a 475 number mean the caller is in Connecticut?

Not necessarily. An area code says where the number was first issued. People keep their numbers when they move or switch carriers, and calling software can show any number, so a 475 call can come from anywhere.

Other area codes in Connecticut

All 4 Connecticut area codes, by area, with the cities each covers

Source: NANPA NPA database, central office code and thousands-block assignments, 2026-10-10. Places are matched to NANPA's rate centres by name; see sources.

Cite this page

zipcodes.pro. “Area code 475.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/area-code/475

Underlying data is public domain or openly licensed — sources, vintages and licences.