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The city of Islandia is in the state of New York. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 631 | 202 | Landline | Neutral Tandem-new York, Llc - Ny | 02/09/2016 |
| 631 | 203 | Wireless | Neutral Tandem-new York, Llc - Ny | 12/31/1969 |
| 631 | 232 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 234 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 272 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 285 | Landline | Verizon New York Inc. | 08/20/2000 |
| 631 | 297 | Landline | Paetec Communications, Inc. - Ny | 08/20/2000 |
| 631 | 334 | Wireless | Sprint Spectrum L.p. | 08/20/2000 |
| 631 | 342 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 348 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 389 | Landline | Broadview Networks, Inc. - Ny | 10/31/2000 |
| 631 | 415 | Landline | Global Crossing Local Services, Inc.-ny | 01/14/2000 |
| 631 | 431 | Wireless | Sprint Spectrum L.p. | 08/20/2000 |
| 631 | 439 | Landline | Cablevision Lightpath, Inc. - Ny | 01/14/2000 |
| 631 | 452 | Wireless | Omnipoint Communications, Inc. - Ny | 09/08/2015 |
| 631 | 463 | Wireless | Sprint Spectrum L.p. | 08/20/2000 |
| 631 | 467 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 468 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 523 | Wireless | Sprint Spectrum L.p. | 08/20/2000 |
| 631 | 533 | Landline | Mci Worldcom Communications Inc. - Ny | 02/09/2009 |
| 631 | 542 | Landline | Telengy L.l.c. - Ny | 03/16/2012 |
| 516 | 580 | Landline | Cellco Partnership Dba Verizon Wireless - Ny | 08/16/2012 |
| 631 | 580 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 582 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 585 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 588 | Landline | Verizon New York Inc. | 01/14/2000 |
| 516 | 607 | Wireless | Sprint Spectrum L.p. | 06/13/2000 |
| 631 | 615 | Landline | Level 3 Communications, Llc - Ny | 01/14/2000 |
| 631 | 630 | Landline | Cablevision Lightpath, Inc. - Ny | 01/14/2000 |
| 631 | 648 | Landline | Cablevision Lightpath, Inc. - Ny | 03/03/2001 |
| 631 | 664 | Wireless | Sprint Spectrum L.p. | 08/20/2000 |
| 934 | 666 | Wireless | Worldcall Interconnect Inc. | 05/20/2016 |
| 631 | 676 | Landline | Cablevision Lightpath, Inc. - Ny | 08/20/2004 |
| 631 | 715 | Landline | Tc Systems,inc. - Ny | 01/14/2000 |
| 631 | 737 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 738 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 739 | Landline | Xo New York, Inc. | 08/20/2000 |
| 631 | 761 | Landline | Cablevision Lightpath, Inc. - Ny | 01/14/2000 |
| 631 | 778 | Landline | Allegiance Telecom, Inc. - Ny | 01/14/2000 |
| 631 | 784 | Landline | Tc Systems,inc. - Ny | 01/14/2000 |
| 631 | 787 | Landline | Tc Systems,inc. - Ny | 01/14/2000 |
| 516 | 810 | Landline | Sprint Spectrum L.p. | 08/14/1998 |
| 631 | 820 | Landline | Mci Worldcom Communications Inc. - Ny | 01/14/2000 |
| 631 | 822 | Landline | Broadview Networks, Inc. - Ny | 10/31/2000 |
| 631 | 851 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 853 | Landline | Verizon New York Inc. | 01/14/2000 |
| 631 | 881 | Landline | At&t Local | 01/14/2000 |
| 631 | 882 | Wireless | Omnipoint Communications, Inc. - Ny | 05/16/2001 |
| 631 | 904 | Landline | Verizon New York Inc. | 01/14/2000 |
| 516 | 909 | Wireless | Sprint Spectrum L.p. | 07/22/1999 |
| 631 | 913 | Landline | Allegiance Telecom, Inc. - Ny | 06/30/2001 |
| 631 | 930 | Landline | Paetec Communications, Inc. - Ny | 06/13/2000 |
| 631 | 963 | Landline | Xo New York, Inc. | 01/14/2000 |
| 631 | 981 | Landline | Verizon New York Inc. | 01/14/2000 |
| 516 | 983 | Landline | Sprint Spectrum L.p. | 10/15/1996 |
| 516 | 991 | Wireless | Sprint Spectrum L.p. | 10/13/1999 |
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