• Seattle Astronomical Society
• Battle Point Astronomical Association (Bainbridge Island)
• Everett Astronomical Society
• Squak Mountain Telescope (Issaquah)
• Boeing Employees' Astronomical Society
• Spokane Astronomical Society
• Tri-City Astronomy Club
• Yakima Astronomical Society

• Methow Dark Sky Coalition

Greg Scheiderer writes Seattle Astronomy blog 

http://www.seattleastronomy.com/ 

Seattle Lighting Design Lab

http://lightingdesignlab.com/