- This is the Lake County Chamber of Commerce 5221 West Grand Avenue Gurnee, Illinois 60031 - 1818 Phone (847)249-3800 Fax (847)249-3892 Email econinfo@lakecounty-il.org View upcoming events! Click here. View our brochure! (Requires Adobe Acrobat) Click here. The Lake County Chamber of Commerce is the economic engine that works for the best interests of the business community. That can mean ...www.lakecounty-il.org