Fill out my online form. Oshkosh Office Systems Inc. Mailing Address 2975 S. Oakwood Road P.O. Box 2586 Oshkosh, WI 54904 Phone: 920.235.8200 Phone: 800.242.8283 Fax: 920.235.8226 email: info@oshkoshofficesystems.com Need Directions?