- Ashtabula Regional Medical Center
- Aultman Alliance Community Hospital
- City of Cleveland
- Cleveland Clinic Akron General Hospital
- Cleveland Clinic Union Hospital
- Coshocton Regional Medical Center (Licensed Practical Nurses and Surgical Technicians)
- Coshocton Regional Medical Center (Registered Nurses)
- Cuyahoga County Board of Health
- East Liverpool City Hospital
- Hillside Rehabilitation Hospital
- Hoxworth Blood Center
- Lima Memorial Hospital
- Mary Rutan Hospital
- Mercy Allen Hospital
- Ohio State University (Bone and Marrow Transplant)
- Ohio State University (Registered Nurses)
- Ohio State University (Respiratory Therapists)
- Ohio State University (Solid Organ Transplant Coordinators)
- Ohio State University (Surgical Technologists)
- ProMedica Defiance Regional Hospital
- Salem Regional Medical Center
- Toledo Lucas County Health Department
- Trinity Medical Center East
- University of Cincinnati Medical Center
- UH Geneva Medical Center
- Visiting Nurses Association
Click here to get more information about each ONA bargaining unit.