--- title: "Area code 959: Connecticut, United States" url: "https://lookvalid.com/area-code/959.md" canonical_url: "https://lookvalid.com/area-code/959" last_updated: "2026-10-23" type: "reference" summary: "Area code 959 serves Connecticut, United States. Number formats, numbering rules, a live phone validator and the other codes in Connecticut." --- # Area code 959: Connecticut, United States Area code 959 serves Connecticut, United States. Number formats, numbering rules, a live phone validator and the other codes in Connecticut. NANPA lists 162 central office codes (prefixes) in use in area code 959, held by 32 holders across 52 rate centers. Onvoy holds the most prefixes, 45 (28%). 100% of the prefixes are pooled, which means their thousands-blocks can belong to different companies. The FCC unwanted-call data has 398 complaints on file for 354 numbers in 959, most often filed as "Unwanted Calls". These are consumer reports, not findings. ## Facts - 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 | 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% | ## Carriers | 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. ## History - 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. ## Nearest area codes 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). ## ZIP codes 88 ZIP codes fall in places that have a rate center in this area code. The places with the most are Hartford, CT (36 ZIP codes), Manchester, CT (4 ZIP codes) and New Britain, CT (4 ZIP codes). A ZIP code and an area code are unrelated systems, so a ZIP code can sit in more than one area code and an area code spans many ZIP codes. ## Complaints on file 398 complaints for 354 numbers. Numbers whose latest complaint falls in each year: - 2023: 32 - 2024: 68 - 2025: 54 ## Questions ### 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. Sources: NANPA central office code report dated 2026-10-17; NANPA NPA report dated 2026-10-18; FCC unwanted-call complaints, data fetched 2026-10-17; ZIP code places from GeoNames (CC BY 4.0).