There are 20 unique Plaintiff surnames beginning with O:

O'Brien	O'Harra	Oberdier	Odell	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	Organ	Orr	Otterbein University	Owen	Owens