The following organizations have  endorsed the principles of The Cascade Agenda:

Apex Systems - Western Operations
Audubon Washington
Bellingham Arts Facilities Info Network
Built Green of King and Snohomish Counties
Cairncross & Hemplemann, P.S.
CamWest Development Inc.
Cascadia Green Building Council
Cedar River Group
City of Kirkland
Climate Solutions
CommEn Space
Conservation Northwest
Constituent Dynamics
David Sherrard DDS,PLLC
Denny Miller and Associates
Downing Pottery
EarthCorps
Elements of Living Magazine
Feathered Friends
Fido's Farm
Futurewise
Galbraith Associates
graysmith
Greater Seattle Chamber of Commerce
Green Diamond Resource Company
Hancock Forest Management
HomeStreet Bank
Howe and Armstrong Consulting
iLanga Inc.
Institute for Community Change
Kate's Billing Solutions
Kittitas Environmental Education Network
Labor Ready
Margot Cheel Aerial Photography
Master Builders Association of King and Snohomish Counties
Mercury
Mercury Digital
Metric Media, Inc.
Metrovation Properties
Metzler North America
Mithun, Inc
Mount Rainier National Park
Mountains to Sound Greenway
National Park Service - Northwest Region
Northwest Center for Livable Communities
Polygon Northwest Company
K&L | Gates
Puget Sound Energy
Quadrant Homes
Red Star Sound
REI
Rollin Fatland and Associates
Ross and Schwartz, LLC
SAP America, Inc.
Seattle Works
Shadow Catcher Entertainment
Stellar North LLC
Sustainable Seattle
Tata Classical
The Boeing Company
The Communications Group, LLC
The Institute for Community Change
The Mercury Group
The Nature Conservancy
The Pike Place Market Preservation and Development Authority
The Trust for Public Land
Towne Planning Services
Transportation Choices Coalition
Unico Properties, Inc.
Urban Land Institute - Seattle
Urban Visions
Vulcan, Inc.
Ward Rugh, Inc.
Washington Alpine Club
Washington Environmental Council
Washington Farm Forestry Association
Washington Forest Protection Association
Washington Native Plant Society - Central Puget Sound Chapter
Washington Recreation and Park Association
Washington Rivers Conservancy
Washington Scuba Alliance
Washington State Department of Natural Resources
Washington Wildlife and Recreation Coalition
Water Rights Inc.
Waterfront Artists' Studio Collective
Wright Runstad & Company