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Area code 959

Where 959 is, how it is dialed, which carriers hold its numbers and how many of its codes are in use, from NANPA's 10/01/2026 files.

State
CT
In service
2014
Assigned codes
163of 800 possible
Carriers
32

Area code 959 at a glance

Area code 959 is a geographic area code in Connecticut, in service since August 30, 2014, according to the North American Numbering Plan Administrator (NANPA). It is an overlay: 959 and 860 cover the same territory, so neighbors on the same street can have different area codes. It is in the Eastern time zone. The places with the most assigned exchanges include Hartford, New Britain, New London, Torrington, and Norwich. By population, its largest named places are Hartford, New Britain, Bristol, Manchester, and Middletown.

Area code 959: NANPA facts
ItemValue
StateConnecticut
In service sinceAugust 30, 2014
Assigned by NANPAOctober 4, 1999
OverlayYes, with 860
Parent area code (NANPA)860
Time zoneEastern
Local calls within the codeten digits (area code plus number)
Assigned central office codes163
Rate centers with codes53
Carriers holding codes32
Pooled codes163
Codes assigned since 2020124
Relief planning in progressNo

Source: NANPA NPA report and utilized central office code file, both dated 10/01/2026.

Cities and towns in area code 959

959 holds 8.1% of the 2,020 central office codes assigned in Connecticut, the 4th most of the state's 4 codes. 42 Census places could be matched to rate centers with 959 exchanges; the most populous are Hartford (122,000), New Britain (75,871), Bristol (62,195), and Manchester (59,948). Each place page lists the exact prefixes and carriers for that town.

Most populous places with 959 exchanges
PlacePopulation (2024)Area codesExchangesCarriers
Hartford, CT122,129860, 95929733
New Britain, CT75,871860, 9593411
Bristol, CT62,195860, 959198
Manchester, CT59,948860, 959219
Middletown, CT48,616860, 9593110
Southington, CT44,197860, 9592312
Enfield, CT41,140860, 9592010
Norwich, CT39,993860, 9594113
Torrington, CT35,673860, 9592110
Glastonbury, CT35,553860, 9592111
Farmington, CT28,189860, 959237
New London, CT28,081860, 9594712
Watertown, CT22,497860, 95998
Plainville, CT17,757860, 95995
Colchester, CT15,752860, 95955

Population: Census Vintage 2024 estimates for the matched place. Exchanges and carriers: NANPA utilized code file.

How calls are dialed in 959

According to NANPA's dialing-plan data, local calls within 959 are dialed as ten digits (area code plus number) and toll calls as 1 plus ten digits. Because local calls need the area code, business cards, signage and website copy should always show the full ten-digit number. NANPA's dialing-plan note for this code reads: "1+10 permissible at service provider discretion"

Carriers with 959 numbers

32 carriers hold the 163 central office codes assigned in 959. Onvoy, LLC - CT has the most, with 46 (28%). 163 of the codes (100%) are pooled, meaning the code holder shares blocks of 1,000 numbers with other carriers instead of using all 10,000 itself. The code holder is not necessarily the carrier serving a given number today, since numbers can be ported between providers.

Largest code holders in area code 959
Carrier (NANPA operating company)ExchangesShare
Onvoy, LLC - CT4628%
Ton80 Communications, LLC2717%
Cellco Partnership d/b/a Verizon Wireless - CT148.6%
Omnipoint Communications, INC. - CT148.6%
Onvoy Spectrum, LLC95.5%
Fractel, LLC84.9%
Teleport Communications America, LLC - CT63.7%
Bandwidth.com CLEC, LLC - CT53.1%
New Cingular Wireless PCS, LLC - DC31.8%
Peerless Network of Connecticut, LLC - CT21.2%
Paetec Itel, LLC21.2%
Ip Horizon LLC21.2%

Carrier names are the operating company (OCN) names on NANPA's utilized central office code file dated 10/01/2026. A carrier holding a code may port numbers to other carriers.

Where 959 numbers are rated

NANPA assigns each central office code to a rate center, the local calling area that decides whether a call is local or toll. 959 has codes in 53 rate centers. Rate center names in the file are abbreviations; where one matches a Census place, the table links to that city's local-number page.

Rate centers in area code 959 by assigned codes
Rate center (NANPA)PlaceCodes
HARTFORDHartford, CT37
NEWBRITAINNew Britain, CT8
NEW LONDONNew London, CT7
TORRINGTONTorrington, CT6
WILLIMNTICnot matched6
NORWICHNorwich, CT6
SOUTHINGTNSouthington, CT4
DEEP RIVERDeep River, CT4
BRISTOLBristol, CT4
GLASTONBYGlastonbury, CT4
FARMINGTONFarmington, CT3
ESSEXEssex, CT3
ENFIELDEnfield, CT3
MIDDLETOWNMiddletown, CT3
PLAINFIELDPlainfield, CT3
CLINTONClinton, CT3
COLCHESTERColchester, CT2
WATERTOWNWatertown, CT2
WASHINGTONWashington, CT2
STORRSnot matched2
CANAANCanaan, CT2
OLD SAYBRKOld Saybrook, CT2
ROCKVILLEnot matched2
CANTONCanton, CT2
PAWCATUCKnot matched2

Top 25 of 53 rate centers.

How full is area code 959?

An area code has 800 possible central office codes that start with 2 through 9, a few of which are reserved (such as N11 service codes and 555). 163 are assigned in 959, 20% of 800. 124 were assigned in 2020 or later.

Area code 959: central office codes by decade assigned
Decade assignedExchangesShare
2010s3623%
2020s12478%

Assignment dates as recorded in NANPA's utilized code file; codes without a recorded date are excluded.

Getting a 959 number for your business

Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.

Porting a number you already use in area code 959 is free, and business texting is available once the carrier registration (10DLC) is approved; the registration carries a one-time $49 fee. Which specific numbers are open in a given area code depends on carrier inventory at the time you sign up.

AI agents are optional: an AI receptionist or scheduler can pick up when the team is busy or closed, take a message, send a text or email, or transfer the call. They draw on prepaid AI minutes ($0.25/minute), disclose that they are AI, and outbound AI calls require prior consent and are limited to 8am–9pm.

Frequently asked questions

Where is area code 959?

959 is a geographic area code in Connecticut. Places with the most assigned exchanges include Hartford, New Britain, New London, and Torrington.

What time zone is area code 959 in?

NANPA lists 959 in the Eastern time zone.

When did area code 959 go into service?

NANPA records an in-service date of August 30, 2014. The code was assigned on October 4, 1999.

Is 959 an overlay area code?

Yes. It shares its territory with 860.

Can my business get a 959 phone number?

Callata includes up to 3 local numbers on its $99/month plan (5 users included). Which 959 numbers are open depends on carrier inventory when you choose, and you can port an existing number for free.