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The city of Johnstown is in the state of Colorado. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 970 | 202 | Wireless | Contact Paging Of Colorado, Inc. | 10/15/1996 |
| 970 | 342 | Landline | Eschelon Telecom Of Colorado, Inc. - Co | 05/22/2013 |
| 970 | 408 | Landline | Teleport Communications America, Llc - Co | 07/15/2014 |
| 970 | 532 | Landline | Qwest Corporation | 02/11/1995 |
| 970 | 578 | Landline | Mcleodusa Telecommunications Services, Inc.- Co | 03/29/2010 |
| 970 | 587 | Landline | Qwest Corporation | 02/11/1995 |
| 970 | 599 | Wireless | New Cingular Wireless Pcs, Llc | 08/19/2008 |
| 970 | 617 | Wireless | Cellco Partnership Dba Verizon Wireless - Co | 12/08/2016 |
| 970 | 621 | Wireless | Contact Paging Of Colorado, Inc. | 10/15/1996 |
| 970 | 646 | Wireless | New Cingular Wireless Pcs, Llc | 12/10/2009 |
| 970 | 660 | Landline | Level 3 Communications, Llc - Co | 10/27/2004 |
| 970 | 685 | Wireless | Cellco Partnership Dba Verizon Wireless - Co | 02/04/2008 |
| 970 | 699 | Wireless | Cellco Partnership Dba Verizon Wireless - Co | 07/10/2014 |
| 970 | 775 | Wireless | New Cingular Wireless Pcs, Llc | 05/12/2009 |
| 970 | 786 | Wireless | Cellco Partnership Dba Verizon Wireless - Co | 05/04/2016 |
| 970 | 800 | Landline | Onvoy, Llc - Co | 11/08/2012 |
| 970 | 820 | Landline | Qwest Corporation | 01/09/2015 |
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