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Area Code Overview
Area code 631 is a geographic telephone area code in New York that went into service on November 1, 1999. The geographic regions covered by this area code overlay has a population of approximately 1,535,909.
Overlay and Dialing Rules
- Area Code: 631
- State: New York
- Type: General Purpose Code
- In Service Date: November 1, 1999
- Overlay Complex: 631/934
- Local Dialing Plan: This area does require you to dial the area code when calling locally.
Estimated Number of Assigned Phone Numbers in Area Code 631
This area code is ranked 61st out of 363 nationwide in estimated assigned phone numbers. Within the state territory it serves, it is ranked 8th out of 21.
6,432,000
Estimated Service-Type Mix of Assigned Phone Numbers in Area Code 631
Wireless
2,124,000 assigned
33.02%
Wireline and VoIP
3,550,000 assigned
55.19%
Other / Unclassified
758,000 assigned
11.78%
Estimated Share of Wireless Numbers Originally Assigned to Each Carrier in Area Code 631
Estimated assigned wireless phone numbers: 2,124,000
Numbers may later be ported to another carrier, but this chart reflects original number assignment, not current subscriber share.
T-Mobile 1,001,000 (47.13%)
Verizon Wireless 578,000 (27.21%)
AT&T Wireless 511,000 (24.06%)
Optimum Mobile 24,000 (1.13%)
LTE WIRELESS INC D/B/A LTE WIRELESS - NY 10,000 (0.47%)
Estimated Share of Wireline and VoIP Numbers Originally Assigned to Each Carrier in Area Code 631
Estimated assigned wireline and VoIP phone numbers: 3,550,000
VERIZON NEW YORK, INC. 1,304,000 (36.73%)
Bandwidth 269,000 (7.58%)
CABLEVISION LIGHTPATH, INC. - NY 233,000 (6.56%)
PAETEC ITEL, LLC 230,000 (6.48%)
Peerless Network 201,000 (5.66%)
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 199,000 (5.61%)
TERRA NOVA TELECOM INC. 61,000 (1.72%)
YMAX COMMUNICATIONS CORP. - NY 58,000 (1.63%)
Other / Unclassified Assigned Numbering in Area Code 631
Estimated assigned other or unclassified phone numbers: 758,000
CSC VOICE, LLC 277,000 (36.54%)
SPOK, INC. 90,000 (11.87%)
IP HORIZON LLC 73,000 (9.63%)
TELENGY L.L.C. - NY 60,000 (7.92%)
CORETEL NEW YORK, INC. - NY 50,000 (6.60%)
HD CARRIER LLC 46,000 (6.07%)
UCOMTEL INC. 32,000 (4.22%)
TC SYSTEMS, INC. - NY 24,000 (3.17%)
AMERICAN NETWORK, INC. 20,000 (2.64%)
PEERING HUB, INC. - NY 15,000 (1.98%)
YORKSTREAM COMMUNICATIONS LLC 12,000 (1.58%)
AMERICAN MESSAGING SERVICES, LLC 10,000 (1.32%)
Cities and Towns in Area Code 631
Amagansett, New York Amityville, New York Atlantic Beach, New York Babylon, New York Bay Shore, New York Bayport, New York Bellport, New York Brentwood, New York Bridgehampton, New York Center Moriches, New York Central Islip, New York Cold Spring Harbor, New York Commack, New York Deer Park, New York East Fire Island, New York East Hampton, New York Eastport, New York Farmingdale, New York Fire Island, New York Fishers Island, New York Greenport, New York Hampton Bays, New York Huntington, New York Islip, New York Jamesport, New York Kings Park, New York Lindenhurst, New York Mattituck, New York Middle Island, New York Montauk, New York Nassau County, New York Northport, New York Orient, New York Patchogue, New York Peconic, New York Port Jefferson, New York Quogue, New York Riverhead, New York Ronkonkoma, New York Sag Harbor, New York Saint James, New York Sayville, New York Selden, New York Shelter Island, New York Shoreham, New York Smithtown, New York Southampton, New York Southold, New York Stony Brook, New York Wading River, New York Water Mill, New York Westhampton Beach, New York Yaphank, New York These geographic regions are also served by area code 934.
How These Figures Were Built
These figures are estimates based on public phone-number assignment records. They are meant to show the likely mix of assigned phone numbers associated with area code 631, not live customer counts.
Some providers may have assigned phone numbers tied to this area code even if they do not actively market or sell service locally. These figures reflect public number-assignment records, not confirmed local service availability.
They also do not reflect number portability at the individual phone-number level, so some numbers may now be used on a different network or by a different provider than the original assignment records suggest.
Population data and locality matching provided by GeoNames.
Last refreshed: April 15, 2026 6:22 pm