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| tribe | date joined | resolution |
| Lummi Nation | Initial | |
| Nooksack Indian Tribe | Initial | Resolution |
| Samish Indian Nation | Initial | Resolution: 11.5.2005 |
| Sauk-Suiattle Indian Tribe | Initial | |
| Stillaguamish Tribe of Indians | Initial | |
| Swinomish Indian Tribal Community | Initial | |
| Tulalip Tribes | Initial | Resolution: 3.6.2005 |
| Upper Skagit Tribe | Initial | Resolution:3.26.2006 CEMP: 3.22.2006 NIMS: 3.22.2006 |
| Snoqualmie Tribe | 11.16.2006 | Resolution |
| Shoalwater Bay Indian Tribe | 2.28.2007 | Resolution |
| Muckleshoot Indian Tribe | 9.21.2007 | Resolution |
| Makah Tribe | 9.26.2007 | Resolution |
| Colville Confederated Tribes | 12.20.2007 | Resolution |
| Yakama Nation | 4.8.2008 | Resolution InterOp Com POC 9.24.2009 |
| Lower Elwha Klallam Tribe | 4.16.2008 | Resolution |
| Cowlitz Indian Tribe | 8.2.2008 | Resolution |
| Hoh Indian Tribe | 10.8.2008 | Resolution |
| Siletz Confederated Tribes | 12.30.2008 | Resolution |
| Spokane Tribe of Indians | 1.5.2009 | Resolution |
| Quinault Indian Nation | 8.24.2009 | Resolution |
| Coeur D'Alene Tribe | 11.12.2009 | Resolution |
| Nisqually Tribe | Resolution |