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The city of Concord is in the state of New Hampshire. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 603 | 219 | Wireless | Sprint Spectrum L.p. | 02/14/2001 |
| 603 | 219 | Wireless | Sprint Spectrum L.p. | 02/14/2001 |
| 603 | 223 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 07/04/1995 |
| 603 | 223 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 07/04/1995 |
| 603 | 224 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 224 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 225 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 225 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 226 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 226 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 227 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 04/01/1997 |
| 603 | 227 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 04/01/1997 |
| 603 | 228 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 228 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 229 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 229 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 230 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 10/15/1996 |
| 603 | 230 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 10/15/1996 |
| 603 | 271 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 271 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 290 | Wireless | United States Cellular Corp. - New Hampshire | 05/18/1998 |
| 603 | 290 | Wireless | United States Cellular Corp. - New Hampshire | 05/18/1998 |
| 603 | 369 | Landline | Level 3 Communications - Nh | 05/18/1998 |
| 603 | 369 | Landline | Level 3 Communications - Nh | 05/18/1998 |
| 603 | 415 | Landline | Freedom Ring Communications, Llc | 05/10/1999 |
| 603 | 415 | Landline | Freedom Ring Communications, Llc | 05/10/1999 |
| 603 | 470 | Wireless | United States Cellular Corp. - New Hampshire | 04/19/2001 |
| 603 | 470 | Wireless | United States Cellular Corp. - New Hampshire | 04/19/2001 |
| 603 | 491 | Wireless | Bell Atlantic Nynex Mobile | 07/01/1996 |
| 603 | 491 | Wireless | Bell Atlantic Nynex Mobile | 07/01/1996 |
| 603 | 496 | Wireless | Bell Atlantic Nynex Mobile | 02/04/1994 |
| 603 | 496 | Wireless | Bell Atlantic Nynex Mobile | 02/04/1994 |
| 603 | 513 | Landline | Bell Atlantic Nynex Mobile | 06/13/2000 |
| 603 | 513 | Landline | Bell Atlantic Nynex Mobile | 06/13/2000 |
| 603 | 545 | Landline | Lightship Telecom, Llc - Nh | 10/13/1999 |
| 603 | 545 | Landline | Lightship Telecom, Llc - Nh | 10/13/1999 |
| 603 | 565 | Landline | Level 3 Communications - Nh | 08/14/1998 |
| 603 | 568 | Wireless | Bell Atlantic Nynex Mobile | 08/06/2002 |
| 603 | 568 | Wireless | Bell Atlantic Nynex Mobile | 08/06/2002 |
| 603 | 715 | Landline | Comcast Phone Of New Hampshire, Llc - Nh | 10/13/1999 |
| 603 | 715 | Landline | Comcast Phone Of New Hampshire, Llc - Nh | 10/13/1999 |
| 603 | 717 | Landline | Choice One Communications Of New Hampshire, Inc. | 01/14/2000 |
| 603 | 717 | Landline | Choice One Communications Of New Hampshire, Inc. | 01/14/2000 |
| 603 | 731 | Wireless | Bell Atlantic Nynex Mobile | 07/01/1996 |
| 603 | 731 | Wireless | Bell Atlantic Nynex Mobile | 07/01/1996 |
| 603 | 738 | Wireless | New Cingular Wireless Pcs, Llc - Dc | 08/20/2000 |
| 603 | 738 | Wireless | New Cingular Wireless Pcs, Llc - Dc | 08/20/2000 |
| 603 | 753 | Landline | No New England Tel Op Dba Fairpoint Comm - Nh | 02/04/1994 |
| 603 | 796 | Landline | Kearsarge Telephone Co. | 02/04/1994 |
| 603 | 848 | Wireless | United States Cellular Corp. - New Hampshire | 07/01/1996 |
| 603 | 848 | Wireless | United States Cellular Corp. - New Hampshire | 07/01/1996 |
| 603 | 856 | Landline | Choice One Communications Of New Hampshire, Inc. | 01/14/2000 |
| 603 | 856 | Landline | Choice One Communications Of New Hampshire, Inc. | 01/14/2000 |
| 603 | 892 | Wireless | Omnipoint Miami E License, Llc | 03/03/2001 |
| 603 | 892 | Wireless | Omnipoint Miami E License, Llc | 03/03/2001 |
| 603 | 931 | Landline | Brooks Fiber Communications Of New Hampshire - Nh | 05/21/2015 |
| 603 | 931 | Landline | Brooks Fiber Communications Of New Hampshire - Nh | 05/21/2015 |
| 603 | 975 | Landline | Comcast Phone Of New Hampshire, Llc - Nh | 11/16/2009 |
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