There are 20 unique surnames beginning with O:
Ohio Department of Mental Hygiene and Correction
Ohio Department of Public Works
Ohio Director of Highways
Ohio Finance Company
Ohio Highway Department
Ohio Lightning Rod Co.
Ohio Mutual Tornado & Windstorm Insurance Association
Ohio Pipe Co.
Ohio Power Company, Canton, OH
Ohio Reformatory for Women
Order of United Commercial Travelers of America
© 2015 Union County, Ohio