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The city of Morristown is in the state of Tennessee. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 423 | 200 | Landline | Level 3 Communications, Llc - Tn | 07/18/2002 |
| 423 | 200 | Landline | Level 3 Communications, Llc - Tn | 07/18/2002 |
| 423 | 206 | Landline | Usa Mobility Wireless, Inc. | 02/12/2001 |
| 423 | 206 | Landline | Usa Mobility Wireless, Inc. | 02/12/2001 |
| 423 | 222 | Landline | Pagepro Corporation | 07/06/1997 |
| 423 | 222 | Landline | Pagepro Corporation | 07/06/1997 |
| 423 | 231 | Wireless | New Cingular Wireless Pcs, Llc - Ga | 01/11/1997 |
| 423 | 231 | Wireless | New Cingular Wireless Pcs, Llc - Ga | 01/11/1997 |
| 423 | 254 | Landline | Business Telecom Inc. - Bti - Tn | 01/25/1998 |
| 423 | 254 | Landline | Business Telecom Inc. - Bti - Tn | 01/25/1998 |
| 423 | 258 | Wireless | New Cingular Wireless Pcs, Llc - Ga | 03/03/2001 |
| 423 | 258 | Wireless | New Cingular Wireless Pcs, Llc - Ga | 03/03/2001 |
| 423 | 273 | Wireless | Sprint Spectrum L.p. | 06/30/2001 |
| 423 | 273 | Wireless | Sprint Spectrum L.p. | 06/30/2001 |
| 423 | 277 | Wireless | Sprint Spectrum L.p. | 08/29/2001 |
| 423 | 277 | Wireless | Sprint Spectrum L.p. | 08/29/2001 |
| 423 | 289 | Landline | At&t Local | 06/18/2001 |
| 423 | 289 | Landline | At&t Local | 06/18/2001 |
| 423 | 307 | Landline | Windstream Norlight, Inc. - Tn | 10/24/2005 |
| 423 | 307 | Landline | Windstream Norlight, Inc. - Tn | 10/24/2005 |
| 423 | 312 | Wireless | Cellco Partnership Dba Verizon Wireless - Tn | 01/10/1996 |
| 423 | 312 | Wireless | Cellco Partnership Dba Verizon Wireless - Tn | 01/10/1996 |
| 423 | 317 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 11/20/1998 |
| 423 | 317 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 11/20/1998 |
| 423 | 318 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/10/1996 |
| 423 | 318 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/10/1996 |
| 865 | 345 | Landline | Charter Fiberlink - Tennessee, Llc - Tn | 04/06/2010 |
| 865 | 345 | Landline | Charter Fiberlink - Tennessee, Llc - Tn | 04/06/2010 |
| 423 | 353 | Landline | Windstream Norlight, Inc. - Tn | 03/16/2011 |
| 423 | 353 | Landline | Windstream Norlight, Inc. - Tn | 03/16/2011 |
| 423 | 438 | Landline | Level 3 Communications, Llc - Tn | 05/02/2002 |
| 423 | 438 | Landline | Level 3 Communications, Llc - Tn | 05/02/2002 |
| 423 | 492 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 04/07/2011 |
| 423 | 492 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 04/07/2011 |
| 423 | 522 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 12/05/2002 |
| 423 | 522 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 12/05/2002 |
| 423 | 581 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/10/1996 |
| 423 | 581 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/10/1996 |
| 423 | 585 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/10/1996 |
| 423 | 585 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/10/1996 |
| 423 | 586 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/10/1996 |
| 423 | 586 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/10/1996 |
| 423 | 587 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/10/1996 |
| 423 | 587 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/10/1996 |
| 423 | 616 | Landline | Mrstwn Ut Comm Dba Mrstwn Ut Sys Fibernet - Tn | 08/18/2014 |
| 423 | 616 | Landline | Mrstwn Ut Comm Dba Mrstwn Ut Sys Fibernet - Tn | 08/18/2014 |
| 423 | 621 | Wireless | Sprint Spectrum L.p. | 08/24/2016 |
| 423 | 621 | Wireless | Sprint Spectrum L.p. | 08/24/2016 |
| 423 | 690 | Landline | Telnyx Llc | 12/02/2016 |
| 423 | 690 | Landline | Telnyx Llc | 12/02/2016 |
| 423 | 714 | Landline | Us Lec Of Tennessee, Inc | 02/27/1999 |
| 423 | 714 | Landline | Us Lec Of Tennessee, Inc | 02/27/1999 |
| 423 | 736 | Wireless | Cellco Partnership Dba Verizon Wireless - Tn | 06/13/2000 |
| 423 | 736 | Wireless | Cellco Partnership Dba Verizon Wireless - Tn | 06/13/2000 |
| 423 | 748 | Wireless | New Cingular Wireless Pcs, Llc - Ga | 06/13/2000 |
| 423 | 748 | Wireless | New Cingular Wireless Pcs, Llc - Ga | 06/13/2000 |
| 423 | 839 | Landline | Charter Fiberlink - Tennessee, Llc - Tn | 10/13/2005 |
| 423 | 839 | Landline | Charter Fiberlink - Tennessee, Llc - Tn | 10/13/2005 |
| 865 | 993 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/14/2000 |
| 865 | 993 | Landline | Bellsouth Telecomm Inc Dba South Central Bell Tel | 01/14/2000 |
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