Middlefield Chamber of Commerce » Member Directory Go back to directory. Add to Address Book. A B C D E F G H J K L M N O P Q R S T V W Z Go back to directory.Add to Address Book. Middlefield Chamber of Commerce Contact: Jim O’Reilly Work P.O. Box 802 15615 W. High St. Middlefield OH 44062 USAwork Work Phone: (440) 632-5705work Work Email: firstname.lastname@example.orgINTERNET Website: www.middlefieldcc.com Business Type Categories: Chambers of Commerce Add to Address Book.