- Access Hospital Dayton
- Adams County Regional Medical Center
- Adena Fayette Medical Center
- Adena Greenfield Medical Center
- Adena Pike Medical Center
- Adena Regional Medical Center
- Advanced Specialty Hospitals of Toledo
- Akron Childrens Hospital
- Akron Childrens Hospital Boardman Campus
- Akron General
- Akron General Lodi Hospital
- AM Behavioral Huber Heights
- Appalachian Behavioral Healthcare Hospital
- Arrowhead Behavioral Health
- Ashtabula Regional Medical Center
- Assurance Health Cincinnati
- Assurance Health Hudson
- Assurance Health Toledo
- Atrium Medical Center
- Aultman Alliance Community Hospital
- Aultman Hospital
- Aultman Orrville Hospital
- Avon Hospital
- Barnesville Hospital
- Beckett Springs
- Bellevue Hospital
- Belmont Pines Hospital
- Berger Hospital
- Bethesda Butler Hospital
- Bethesda North Hospital