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The 631 area code is a telephone prefix located in New York and corresponds to the southwestern region of the state. 

This code surrounds the entire Suffolk County, comprising the geographic majority of Long Island. Being the only county in the 631 service area, Suffolk is predominantly a suburban region and includes the municipalities of Brentwood, West Babylon, Coram, Commack, and Central Islip. 

The 631 area code is one of the 19 area codes that compound the telephonic service of New York. Moreover, this prefix disposes of a single overlay, the dialing code 934, which surrounds the same zone. 


1. History

With the establishment of the North American Numbering Plan (NANP) in 1947, the entire New York region received five area codes for the whole territory, being the largest network of the country. At this time, Nassau and Suffolk counties, the lower Hudson Valley, and some surrounding locations obtained the 914 area code. 

This codification covers the mentioned area until January 1, 1951, when the 516 area code arrived at the region enclosing Nassau and Suffolk counties and reducing the coverage radius of the number 914. 

In this way, on November 1, 1999, the 516 dialing code gave rise to the 631 area code, which emerged as a split from this number. With its activation, Suffolk County obtained the new prefix, while Nassau retained the old one. 

On the other hand, on July 16, 2016, the New York Public Commission put in service the 934 area code as part of an overlay plan for the county network. It becomes the first overlay code for a region of the state outside New York City.      

2. Location

New York is one of the 13 original colonies and states of the country. Being, the 11th state, its foundation dates from July 26, 1788. This region is home to New York City one of the most important cities of the U.S and a global hub of business and commerce. 

New York lies in the Mid-Atlantic and Northeastern regions of the nation. With a population estimated at 20.4 million people, it is the fourth-most populous state of the territory. Besides, it covers a total area of 54,556 square miles and encompasses the largest urban area in the world. 

On the other hand, the 631 area code just served Suffolk County, which represents the easternmost county of America. Incorporated in the New York metro area, it is the fourth-most populous county of the state, encompassing 1.4 million inhabitants. 

Located in the Eastern Daylight time zone, the prefix 631 surrounds 923.60 square miles and possesses 112 non-unique postal area zip codes.

Adjacent codes

Currently, New York possesses one of the largest telecommunication services of the U.S. its most employed area code is the prefix 718 serving nearly 6.7 million users and containing 167 non-unique zip codes, within New York City. 

Another significant prefix is the 212 area code, which covers Manhattan, the smallest of the five boroughs of New York City in terms of territory. Also, the 212 code is one of the five original state prefixes and disposes of three overlays, 332, 646, and 917.   

In contrast, the most recent area code introduced to the state’s network is the dialing number 838. It started running on September 19, 2017, as an overlay for the 518 area code. At the moment both codes correspond to northeastern New York and surround 17 counties and the city-state capital of Albany

3. Most Important Cities in the 631 Area Code


Islip is one of the ten towns incorporated in Suffolk County and covers a total area of 162.98 square miles. This municipality lies on the south shore of Lon Island and delimits the town of Babylon to the west, Brookhaven to the east, Smithtown to the north, and the Atlantic Ocean to the south. 

At the time, Islip owns an estimated population of around 331k inhabitants, becoming the fourth-most populated municipality of New York. Also, Islip is home to several villages, hamlets, and communities, including Brentwood, Holbrook, Dunewood, among others.  


Settled in 1655 and incorporated as a town in 1686, Brookhaven encompasses over 476k residents, being the most populous of the ten towns of Suffolk County and the third-most populated municipality of the state after New York City and Hempstead

Located 50 miles from Manhattan, it sprawls across the north shore to the south shore of Long Island. Forming part of the New York metropolitan area, this town surrounds 531.54 square miles, becoming the most extensive town of the region. 

Other Important Locations and ZIP Codes of the 631 Area Code

New York State is constituted of five boroughs, 62 counties, 932 towns, and 62 cities. Some of the municipalities covered by the 631 area code are:  

  • Brentwood: Located in the town of Islip, Brentwood is the most populous hamlet of Suffolk County, encompassing around 60k residents. It covers a total area of 11.0 square miles and possesses a single postal area zip code: 11717


  • West Babylon: with a population estimated at 43k residents, West Babylon is one of the most populous municipalities of Babylon Town. It surrounds 20.9 square miles and encloses two postal area zip codes: 11704, and 11707. 


  • Coram: situated in the town of Brookhaven, Coram is a hamlet and a census-designated place that covers nearly 13.8 square miles. Encompassing around 39k people it is home to the historic district of Longwood Central School and owns just one postal area zip code: 11727


  • Commack: this hamlet corresponds to Smithtown and Huntington Town and is one of the largest hamlets in terms of population covered by the 631 area code, enclosing more than 36k inhabitants. covering 12.0 square miles it has a single postal area zip code: 11725

Main Postal and Shipping Services

  • The UPS Store, LLC, Sayville, NY, - +1 631-218-5800
  • FedEx Office Print & Ship Center, Hauppauge, NY, - +1 631-232-6500
  • Global Cargo, Brentwood, NY, - +1 631-456-5710
  • UPS Authorized Shipping Provider,  Mattituck, NY, - +1 631-298-8420


How many area codes are there in Suffolk County?

Currently, Suffolk County disposes of three area codes, 516, 631 and 934

What is the most recent area code added to New York?

The newest prefix added to the New York network is the 838 area code, introduced in 2017.