Area code
475
475 is a United States area code. Under the North American Numbering Plan it belongs to Connecticut, which has 4 area codes in total.
Validate a number in 475
Paste a full number and the tool checks it against the numbering plan. It returns the standard formats, the line type the plan assigns and the area code region.
Digits with or without punctuation work. Numbers outside the US are read with the +country code.
Area code 475 at a glance
NANPA lists 284 central office codes (prefixes) in use in area code 475, held by 31 holders across 32 rate centers.
| Fact | Value |
|---|---|
| In service since | 2009-12-12 |
| Time zone | Eastern (E) |
| Assigned overlays | 203 (1947-01-01) |
| Prefixes in use | 284 |
| Pooled prefixes | 284 (100%) |
| Rate centers | 32 |
| Companies holding prefixes | 31 |
| Assignment dates on file | 2009-08-07 to 2026-08-06 (281 prefixes) |
| ZIP codes in its places | 120 |
Rate centers in area code 475
| Rate center | Prefixes | Share |
|---|---|---|
| NEW HAVEN | 42 | 15% |
| STAMFORD | 27 | 10% |
| BRIDGEPORT | 25 | 9% |
| NORWALK | 22 | 8% |
| ANSONIDRBY | 18 | 6% |
| DANBURY | 18 | 6% |
| WATERBURY | 18 | 6% |
| HUNTINGTON | 9 | 3% |
| 24 other rate centers | 105 | 37% |
Who holds the prefixes in 475
Onvoy holds the most prefixes, 59 (21%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Onvoy | 59 | 21% |
| Verizon Wireless | 47 | 17% |
| Omnipoint Communications | 39 | 14% |
| Bandwidth.com CLEC | 18 | 6% |
| New Cingular Wireless PCS | 18 | 6% |
| Ton80 Communications | 17 | 6% |
| 25 other carriers | 86 | 30% |
A prefix holder is the company a code was assigned to, not necessarily a number's current carrier, because numbers can be ported to another company. Find which carrier a number is on, or browse the prefix holders.
History of area code 475
- 1947-01-01 Area code 203, named as the parent of 475 in the NANPA report, was in service.
- 2009-12-12 Area code 475 went into service.
Area codes nearest to 475
Distance is measured between the centers of the ZIP code places each area code serves, so it is a rough guide.
Overlay codes in the same area
ZIP codes in area code 475
120 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| New Haven, CT | 28 |
| Stamford, CT | 17 |
| Waterbury, CT | 16 |
A ZIP code and an area code are unrelated systems. A ZIP code can sit in more than one area code, and an area code spans many ZIP codes.
Complaints on file for 475 numbers
1,208 FCC complaints are on file for 1,022 numbers in 475, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 101 |
| 2024 | 166 |
| 2025 | 134 |
Other area codes in Connecticut
Connecticut is one state with 4 area codes in the NANPA table. 475 is one of them.
Next to 475 in the numbering table
These are the codes just before and after 475 when all are sorted by number. They are neighbours on the list, not necessarily on the map.
What the area code does and does not tell you
A number that starts with 475 was first assigned in Connecticut. That is a fact about where the number began, and it is a useful hint when you check a form entry, for example a billing address in Connecticut next to a 475 phone number.
It does not show where the person is today. A number stays with its owner after a move or a change of provider (number portability), and mobile numbers travel with the handset. The area code also cannot tell you whether the line is active, who the carrier is, or whether the number is mobile or fixed: the plan shares those ranges. Read more about the area code, the numbering plan and line type.
Check numbers in bulk with the API
| Product | Credits | Docs |
|---|---|---|
| Phone Numbering-Plan Validation | 1 credit per valid number | API docs |
| Phone Intelligence (carrier and line status) | 1 credit per check (invalid numbers outside the US and Canada are free) | Product page |
Questions about area code 475
Where is area code 475?
NANPA assigns area code 475 to Connecticut, United States.
In which state does area code 475 sit?
Connecticut. 475 is one of 4 area codes the NANPA table assigns to the state.
Which places does area code 475 cover?
The places with the most ZIP codes among the rate centers in 475 are New Haven, CT, Stamford, CT and Waterbury, CT. The rate center list on this page shows all of them.
Who owns area code 475?
NANPA assigns area codes. Within 475, Onvoy holds the most prefixes, 59 prefixes or 21%.
Which time zone does 475 use?
The NANPA NPA report lists the time zone for 475 as Eastern (E).
What year did 475 enter service?
The NANPA NPA report gives an in-service date of 2009-12-12, so 475 has been in use since 2009.
Does area code 475 have an overlay?
Yes. 203 (in service 1947-01-01) shares the same area with 475, so numbers from all of them are local to each other.
Which area codes are nearest to 475?
The area codes closest to 475, measured between the centers of the ZIP code places they serve, are 934 (about 31 miles), 631 (about 32 miles), 516 (about 35 miles), 914 (about 38 miles) and 860 (about 41 miles).
How many prefixes does area code 475 have?
NANPA's report dated 2026-10-17 lists 284 prefixes in service in 475, spread over 32 rate centers and 31 holders.
Are there complaints about 475 numbers?
The FCC data on file has 1,208 complaints for 1,022 numbers in 475. They are unverified consumer reports. A number with no complaints on file is not proven safe.
Area code assignments: North American Numbering Plan Administrator NPA report, file dated 10/17/2026, retrieved 2026-10-17. Source file. New codes are assigned several times a year. Prefixes, rate centers, holders, time zone, in-service date and overlays: NANPA central office code report dated 2026-10-17 and NPA report dated 2026-10-18. Complaints: FCC consumer complaints open data, fetched 2026-10-17. ZIP code places: Postal code places and coordinates: GeoNames (geonames.org), licensed CC BY 4.0.