National Association of Manufacturers
http://www.nam.org

Washington Economic Development Association (WEDA)
http://www.wedaonline.org/

Council of Development Finance Agencies (CDFA)
http://www.cdfa.net/cdfa/cdfaweb.nsf/pages/index.html

Pacific Northwest Economic Development Council 
http://www.pnedc.org

Manufacturing Industrial Council
http://www.seattleindustry.org