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The city of Ansonia is in the state of Connecticut. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 475 | 223 | Wireless | Omnipoint Communications, Inc. - Ct | 05/23/2014 |
| 475 | 228 | Wireless | Cellco Partnership Dba Verizon Wireless - Ct | 01/28/2016 |
| 203 | 231 | Wireless | Cellco Partnership Dba Verizon Wireless - Ct | 04/01/1997 |
| 475 | 243 | Landline | Peerless Network Of Connecticut, Llc - Ct | 02/08/2013 |
| 203 | 278 | Wireless | Omnipoint Communications, Inc. - Ct | 05/01/2001 |
| 203 | 305 | Wireless | New Cingular Wireless Pcs, Llc - Dc | 02/11/1995 |
| 203 | 308 | Wireless | Cellco Partnership Dba Verizon Wireless - Ct | 10/22/2008 |
| 203 | 343 | Wireless | New Cingular Wireless Pcs, Llc - Dc | 01/18/2012 |
| 475 | 439 | Wireless | New Cingular Wireless Pcs, Llc - Dc | 08/05/2015 |
| 203 | 446 | Landline | Teleport Communications America, Llc - Ct | 10/11/1997 |
| 203 | 516 | Landline | Global Crossing Local Services, Inc.-ct | 03/03/2001 |
| 475 | 731 | Wireless | Omnipoint Communications, Inc. - Ct | 08/10/2015 |
| 203 | 732 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 203 | 734 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 203 | 735 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 203 | 736 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 203 | 751 | Landline | Southern New England Telco Dba Frontier Comm Of Ct | 02/04/1994 |
| 475 | 777 | Landline | Peerless Network Of Connecticut, Llc - Ct | 10/07/2014 |
| 203 | 893 | Wireless | Cellco Partnership Dba Verizon Wireless - Ct | 06/29/2007 |
| 203 | 906 | Wireless | Cellco Partnership Dba Verizon Wireless - Ct | 04/23/2002 |
| 203 | 954 | Landline | Choice One Communications, Inc. - Ct | 08/20/2000 |
| 203 | 997 | Wireless | Omnipoint Communications, Inc. - Ct | 05/18/2011 |
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