| Benton-Franklin Council of Governments; Puget Sound Regional Council; Spokane Regional Transportation Council; Okanogan Council of Governments RTPO |
| Chelan - Douglas Transportation Council; Southwest Washington Regional Transportation Council; Thurston Regional Planning Council; Walla Walla Valley Sub-RTPO; Island RTPO |
| Northeast Washington RTPO; Palouse RTPO; Peninsula RTPO; Whatcom Council of Governments; Yakima Valley Conference of Governments |
| Quad-County RTPO; Skagit Council of Governments; Southwest Washington RTPO |