Map for Area Development Foundation of Knox County Map for Area Development Foundation of Knox County Search | Advanced Search | New Members | Coupons and Discounts | All Categories Other >> Government/Legislative/Lobbying News Area Development Foundation of Knox County 110 East High StreetMount Vernon, OH 43050 | directions (740) 393-3806 Visit Site Need to update your categories or expand your listing? Or want to learn how your business can become a part of the Chamber? Contact us at membership@columbus.org for assistance.