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The city of Carter Lake is in the state of Iowa. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 712 | 242 | Landline | Windstream Communications Of The Midewest Inc - Ne | 10/11/1997 |
| 712 | 248 | Landline | Mcleodusa Telecommunications Services, Inc.- Ia | 04/03/2001 |
| 712 | 256 | Landline | Cox Iowa Telcom. Llc | 02/27/1999 |
| 712 | 308 | Landline | At&t Local | 06/19/2002 |
| 712 | 309 | Landline | Mcleodusa Telecommunications Services, Inc.- Ia | 03/03/2001 |
| 712 | 310 | Wireless | Cellco Partnership Dba Verizon Wireless - Ia | 03/18/2002 |
| 712 | 314 | Wireless | Sprint Spectrum L.p. | 03/03/2001 |
| 712 | 318 | Landline | Aureon Communications, Llc | 08/02/2013 |
| 712 | 322 | Landline | Qwest Corporation | 02/04/1994 |
| 712 | 323 | Landline | Qwest Corporation | 02/04/1994 |
| 712 | 325 | Landline | Qwest Corporation | 02/04/1994 |
| 712 | 326 | Landline | Qwest Corporation | 02/04/1994 |
| 712 | 328 | Landline | Qwest Corporation | 02/04/1994 |
| 712 | 329 | Landline | Qwest Corporation | 01/10/1996 |
| 712 | 347 | Landline | Qwest Corporation | 01/10/1996 |
| 712 | 352 | Landline | Qwest Corporation | 05/18/1998 |
| 712 | 355 | Wireless | United States Cellular Corp. - Iowa | 07/24/2003 |
| 712 | 366 | Landline | Qwest Corporation | 02/04/1994 |
| 712 | 388 | Landline | Qwest Corporation | 11/20/1998 |
| 712 | 396 | Landline | Qwest Corporation | 03/02/2001 |
| 712 | 435 | Wireless | Sprint Spectrum L.p. | 04/17/2002 |
| 712 | 828 | Landline | Windstream It-comm, Llc - Ia | 11/11/2009 |
| 712 | 847 | Landline | Cox Iowa Telcom. Llc | 08/14/1998 |
| 712 | 890 | Landline | Teleport Communications America, Llc - Ia | 05/18/1998 |
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