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The city of Fairfield is in the state of Connecticut. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 475 | 236 | Unknown | Omnipoint Communications, Inc. - Ct | 09/01/2017 |
| 203 | 254 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 203 | 254 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 203 | 255 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 203 | 255 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 203 | 256 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 203 | 256 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 475 | 259 | Unknown | Sprint Spectrum L.p. | 09/25/2017 |
| 203 | 259 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 203 | 259 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 203 | 292 | Landline | Cablevision Lightpath, Inc. - Ct | 04/01/1997 |
| 203 | 292 | Landline | Cablevision Lightpath, Inc. - Ct | 04/01/1997 |
| 203 | 307 | Landline | Brooks Fiber Communications Of Connecticut Inc-ct | 01/31/2005 |
| 203 | 307 | Landline | Brooks Fiber Communications Of Connecticut Inc-ct | 01/31/2005 |
| 203 | 319 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/11/1995 |
| 203 | 319 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/11/1995 |
| 203 | 418 | Landline | Teleport Communications America, Llc - Ct | 04/01/1997 |
| 203 | 418 | Landline | Teleport Communications America, Llc - Ct | 04/01/1997 |
| 203 | 480 | Landline | Brooks Fiber Communications Of Connecticut Inc-ct | 01/25/1998 |
| 203 | 480 | Landline | Brooks Fiber Communications Of Connecticut Inc-ct | 01/25/1998 |
| 203 | 659 | Landline | Paetec Communications, Llc - Ct | 10/13/1999 |
| 203 | 659 | Landline | Paetec Communications, Llc - Ct | 10/13/1999 |
| 203 | 692 | Landline | Global Crossing Local Services, Inc.-ct | 03/03/2001 |
| 203 | 692 | Landline | Global Crossing Local Services, Inc.-ct | 03/03/2001 |
| 203 | 763 | Landline | Level 3 Communications, Llc - Ct | 01/14/2000 |
| 203 | 763 | Landline | Level 3 Communications, Llc - Ct | 01/14/2000 |
| 203 | 844 | Landline | Brooks Fiber Communications Of Connecticut Inc-ct | 08/16/2004 |
| 203 | 844 | Landline | Brooks Fiber Communications Of Connecticut Inc-ct | 08/16/2004 |
| 475 | 888 | Landline | Peerless Network Of Connecticut, Llc - Ct | 10/07/2014 |
| 475 | 888 | Landline | Peerless Network Of Connecticut, Llc - Ct | 10/07/2014 |
| 203 | 955 | Landline | Brooks Fiber Communications Of Connecticut Inc-ct | 02/20/2004 |
| 203 | 955 | Landline | Brooks Fiber Communications Of Connecticut Inc-ct | 02/20/2004 |
| 475 | 999 | Landline | Peerless Network Of Connecticut, Llc - Ct | 02/08/2013 |
| 475 | 999 | Landline | Peerless Network Of Connecticut, Llc - Ct | 02/08/2013 |
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