Seattle Metropolitan Chamber of Commerce | 7,819 followers on LinkedIn. WHO WE ARE The Seattle Metro Chamber is the largest and most diverse business association in the region representing 2,500 member companies and a workforce of about 750,000. OUR VISION We seek an economically vibrant and globally competitive region where businesses of all sizes flourish and prosperity is shared. OUR MISSION The Chamber is a business advocacy organization that helps our members thrive in an equitable and inclusive regional economy.