The St. Charles Convention Center is a convention center in St. Charles, Missouri. It opened in April 2005 and is managed by Oak View Group. The facility has a 16,200 sq ft. Grand Ballroom, and 27,600 sq ft. of Exhibit Hall space expandable to 35,700 sq ft. through the adjacent Junior Ballroom. Address: 1 Convention Center Blvd, St Charles, MO 63303