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The city of Mountlake Terrace is in the state of Washington. It has the following active area codes:
| NPA | NXX | Usage | Company Name | NXX Introduced Date |
|---|---|---|---|---|
| 425 | 218 | Wireless | Cellco Partnership Dba Verizon Wireless - Wa | 06/30/2001 |
| 425 | 275 | Landline | Integra Telecom Of Washington, Inc. - Wa | 01/24/2001 |
| 425 | 329 | Landline | Xo Washington, Inc. - Wa | 03/20/2001 |
| 425 | 361 | Landline | Level 3 Communications, Llc - Wa | 10/22/2001 |
| 425 | 431 | Landline | Electric Lightwave, Llc Dba Integra Telecom - Wa | 05/20/2005 |
| 425 | 478 | Wireless | Cellco Partnership Dba Verizon Wireless - Wa | 11/20/1998 |
| 425 | 582 | Landline | Comcast Phone Of Washington Oregon, Llc - Wa | 08/20/2000 |
| 425 | 640 | Landline | Frontier Communications Northwest Inc. - Wa | 04/01/1997 |
| 425 | 670 | Landline | Frontier Communications Northwest Inc. - Wa | 04/01/1997 |
| 425 | 672 | Landline | Frontier Communications Northwest Inc. - Wa | 04/01/1997 |
| 425 | 673 | Landline | Frontier Communications Northwest Inc. - Wa | 07/06/1997 |
| 425 | 697 | Landline | Frontier Communications Northwest Inc. - Wa | 11/20/1998 |
| 425 | 712 | Landline | Frontier Communications Northwest Inc. - Wa | 04/01/1997 |
| 425 | 744 | Landline | Frontier Communications Northwest Inc. - Wa | 04/01/1997 |
| 425 | 771 | Landline | Frontier Communications Northwest Inc. - Wa | 04/01/1997 |
| 425 | 772 | Wireless | T-mobile Usa, Inc. | 10/13/1999 |
| 425 | 773 | Wireless | T-mobile Usa, Inc. | 10/13/1999 |
| 425 | 774 | Landline | Frontier Communications Northwest Inc. - Wa | 04/01/1997 |
| 425 | 775 | Landline | Frontier Communications Northwest Inc. - Wa | 04/01/1997 |
| 425 | 776 | Landline | Frontier Communications Northwest Inc. - Wa | 04/01/1997 |
| 425 | 778 | Landline | Frontier Communications Northwest Inc. - Wa | 04/01/1997 |
| 425 | 977 | Landline | Electric Lightwave, Llc Dba Integra Telecom - Wa | 05/10/1999 |
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