Area code
959
959 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 959
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 959 at a glance
NANPA lists 162 central office codes (prefixes) in use in area code 959, held by 32 holders across 52 rate centers.
| Fact | Value |
|---|---|
| In service since | 2014-08-30 |
| Time zone | Eastern (E) |
| Assigned overlays | 860 (1995-08-28) |
| Prefixes in use | 162 |
| Pooled prefixes | 162 (100%) |
| Rate centers | 52 |
| Companies holding prefixes | 32 |
| Assignment dates on file | 2014-09-18 to 2026-08-26 (159 prefixes) |
| ZIP codes in its places | 88 |
Rate centers in area code 959
| Rate center | Prefixes | Share |
|---|---|---|
| HARTFORD | 37 | 23% |
| NEWBRITAIN | 8 | 5% |
| NEW LONDON | 7 | 4% |
| NORWICH | 6 | 4% |
| TORRINGTON | 6 | 4% |
| WILLIMNTIC | 6 | 4% |
| BRISTOL | 4 | 2% |
| DEEP RIVER | 4 | 2% |
| 44 other rate centers | 84 | 52% |
Who holds the prefixes in 959
Onvoy holds the most prefixes, 45 (28%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies.
| Holder | Prefixes | Share |
|---|---|---|
| Onvoy | 45 | 28% |
| Ton80 Communications | 27 | 17% |
| Omnipoint Communications | 14 | 9% |
| Verizon Wireless | 14 | 9% |
| Onvoy Spectrum | 9 | 6% |
| Fractel | 8 | 5% |
| 26 other carriers | 45 | 28% |
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 959
- 1995-08-28 Area code 860, named as the parent of 959 in the NANPA report, was in service.
- 2014-08-30 Area code 959 went into service.
Area codes nearest to 959
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 959
88 ZIP codes fall in places that have a rate center in this area code.
| Place | ZIP codes |
|---|---|
| Hartford, CT | 36 |
| Manchester, CT | 4 |
| New Britain, CT | 4 |
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 959 numbers
398 FCC complaints are on file for 354 numbers in 959, most often filed as "Unwanted Calls". These are unverified consumer reports.
| Year of latest complaint | Numbers |
|---|---|
| 2023 | 32 |
| 2024 | 68 |
| 2025 | 54 |
Other area codes in Connecticut
Connecticut is one state with 4 area codes in the NANPA table. 959 is one of them.
Next to 959 in the numbering table
These are the codes just before and after 959 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 959 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 959 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 959
Where is area code 959?
NANPA assigns area code 959 to Connecticut, United States.
In which state does area code 959 sit?
Connecticut. 959 is one of 4 area codes the NANPA table assigns to the state.
Which places does area code 959 cover?
The places with the most ZIP codes among the rate centers in 959 are Hartford, CT, Manchester, CT and New Britain, CT. The rate center list on this page shows all of them.
Who owns area code 959?
NANPA assigns area codes. Within 959, Onvoy holds the most prefixes, 45 prefixes or 28%.
Which time zone does 959 use?
The NANPA NPA report lists the time zone for 959 as Eastern (E).
What year did 959 enter service?
The NANPA NPA report gives an in-service date of 2014-08-30, so 959 has been in use since 2014.
Does area code 959 have an overlay?
Yes. 860 (in service 1995-08-28) shares the same area with 959, so numbers from all of them are local to each other.
Which area codes are nearest to 959?
The area codes closest to 959, measured between the centers of the ZIP code places they serve, are 203 (about 41 miles), 413 (about 41 miles), 475 (about 41 miles), 631 (about 60 miles) and 934 (about 62 miles).
How many prefixes does area code 959 have?
NANPA's report dated 2026-10-17 lists 162 prefixes in service in 959, spread over 52 rate centers and 32 holders.
Are there complaints about 959 numbers?
The FCC data on file has 398 complaints for 354 numbers in 959. 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.