Area Code 631
Telephone Central Office Building Pictures

The following are representative examples of telephone central office buildings in Area Code 631 (eastern Long Island/Suffolk County).

Click on the pictures below for a larger version.

Atlantic "Mastic"	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: MSTCNYMCDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 281, 395, 399, 874, 878 Notes: Also serves the Center Moriches ratecenter. Source: GSV
Babylon	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: BBYLNYBNDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (631) 321, 376, 422, 587, 661, 669, 884, 888, 893 Notes: Also serves parts of Lindenhurst. Source: GSV
Bay Shore Photo 2	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: BYSHNYBYDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (631) 206, 224, 277, 581, 665-6, 859, 968-9 Notes: Originally was a #5 Crossbar switch. Also serves Islip rate center. Photo 2 is from July 2005. Current photo: GSV
Brentwood Photo 2	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: BRWDNYBWDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 231-4, 272-3, 300, 342, 348, 357, 434-6, 582, 851, 904, 951-2 Notes: Also serves Central Islip rate center.  Photo 2 is from July 2010. Current photo: GSV
Commack	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: CMMKNYCMDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 462, 493, 499, 543, 858, 864 Notes: Also serves parts of West Commack. Source: GSV
Deer Park	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: DRPKNYDPDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (631) 242-3, 254, 274, 491-2, 586, 595, 643, 667 Notes: Also serves Midland. Source: GSV
East Hampton	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: EHTNNYEHDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 267, 324, 329, 907 Notes: Also serves Amagansett. Source: GSV
Fire Island "Ocean Beach" Photo 2 | Photo 3 | Photo 4	Listing Updated: November 2023 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: OCBHNYOBRS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Remote Prefixes Served: (631) 583, 597 Notes: Current photo: GSV. Photos 2-4: July 2010. Also serves East Fire Island rate center. Fire Island is a barrier island south of Long Island. The only way you can get here is by passenger ferry. There are very few cars on the island, and the main transportation is either on foot or by bicycle. This CO building is located in the community of Ocean Beach, which is the commerce center of the island (lots of shops and restaurants). Notice in Photo 3 of the old New York Telephone sign.
Greenport (Suffolk)	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: GPTSNYGPDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 323, 477, 749 Notes: Also serves the Orient and Shelter Island ratecenters. Source: GSV
Hampton Bays	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: HMBYNYHBDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 723, 728 Notes: Source: GSV
Lindenhurst	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: LHSTNYLHRP0 Switch Type: Ribbon/Genband/Nortel CS2K Remote Prefixes Served: (631) 225-6, 789, 841-2, 956-7 Notes: Also serves parts of Amityville. Source: GSV
Montauk Point	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: MNTKNYMTDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 668 Notes: Source: GSV
Northport "East Northport"	Listing Updated: November 2020 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: ENPTNYENDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (631) 261-2, 266, 269, 368, 544, 754, 757, 912 Notes: Also serves the ratecenters of West Commack and Kings Park. Source: Jon K.
Patchogue	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: PCHGNYPHDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 207, 286, 289, 363, 447, 475, 654, 687, 758, 776 Notes: Also serves Bayport and Bellport. Source: GSV
Port Jefferson	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: PJSTNYPJDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (631) 331, 473-4, 476, 642, 928 Notes: Source: GSV
Riverhead	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: RVHDNYRVDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 208, 284, 369, 506, 548, 722, 727, 905, 953 Notes: Also serves Jamesport. Source: GSV
Ronkonkoma	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: RNKNNYRNDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 285, 467-8, 471, 580, 585, 588, 737-8, 981 Notes: Source: GSV
Sayville	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: SYVLNYSADS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (631) 218, 244, 319, 419, 472, 563, 567, 589 Notes: Source: GSV
Selden	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: SLDNNYSEDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (631) 451, 696, 698, 716, 732, 736 Notes: Source: GSV
Smithtown	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: SMTWNYSMDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (631) 265, 360-1, 366, 382, 584, 724, 862-3, 979 Notes: Also serves St. James. Source: GSV
Southampton	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: SATNNYSNDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 204, 259, 283, 287, 726 Notes: Also serves Water Mill. Source: GSV
Southold "Cutchogue"	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: CTCHNYCUDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 298, 734, 765 Notes: Also serves the Mattituck and Peconic ratecenters. Source: GSV
Stony Brook "Setauket"	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: STKTNYSKDS0 Switch Type: Nokia/Alcatel/Lucent 5ESS Prefixes Served: (631) 216, 246, 444, 632, 638, 689, 751, 941 Notes: Source: GSV
Westhampton	Listing Updated: April 2021 Operating Company: Verizon/Bell Atlantic/NYNEX/New York Telephone CLLI: WHBHNYWBDS0 Switch Type: Ribbon/Genband/Nortel DMS-100 Prefixes Served: (631) 288, 325, 653, 898 Notes: Also serves Eastport and Quogue. Source: GSV

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