| UNC Rockingham | Eden, NC | Acute Care Hospitals | 4 stars |
| Union General Hospital | Farmerville, LA | Critical Access Hospitals | Not rated |
| Union Hospital Clinton | Clinton, IN | Critical Access Hospitals | 2 stars |
| Union Hospital Inc | Terre Haute, IN | Acute Care Hospitals | 3 stars |
| Union Hospital of Cecil County | Elkton, MD | Acute Care Hospitals | 4 stars |
| Uniontown Hospital | Uniontown, PA | Acute Care Hospitals | 2 stars |
| United Health Services Hospitals, Inc | Binghamton, NY | Acute Care Hospitals | 2 stars |
| United Hospital Center, Inc | Bridgeport, WV | Acute Care Hospitals | 4 stars |
| United Memorial Medical Center | Batavia, NY | Acute Care Hospitals | 2 stars |
| United Methodist Behavioral Hospital | Maumelle, AR | Psychiatric | Not rated |
| United Regional Health Care System | Wichita Falls, TX | Acute Care Hospitals | 3 stars |
| Unity Health - Jacksonville | Jacksonville, AR | Acute Care Hospitals | Not rated |
| Unity Hospital | Rochester, NY | Acute Care Hospitals | 2 stars |
| Unity Medical Center | Grafton, ND | Critical Access Hospitals | Not rated |
| Unity Medical Center | Manchester, TN | Acute Care Hospitals | 3 stars |
| Unity Specialty Hospital | Rochester, NY | Acute Care Hospitals | Not rated |
| Unitypoint Health - Des Moines Iowa Methodist Medi | Des Moines, IA | Acute Care Hospitals | 3 stars |
| Unitypoint Health - Marshalltown | Marshalltown, IA | Acute Care Hospitals | 3 stars |
| Unitypoint Health - Meriter | Madison, WI | Acute Care Hospitals | 5 stars |
| University Behavioral Center | Orlando, FL | Psychiatric | Not rated |
| University Health Lakewood Medical Center | Kansas City, MO | Acute Care Hospitals | 4 stars |
| University Health System, Inc | Knoxville, TN | Acute Care Hospitals | 4 stars |
| University Hospitals - Elyria Medical Center | Elyria, OH | Acute Care Hospitals | 4 stars |
| University Hospitals Ahuja Medical Center | Beachwood, OH | Acute Care Hospitals | 3 stars |
| University Hospitals Portage Medical Center | Ravenna, OH | Acute Care Hospitals | 3 stars |
| University Medical Center New Orleans | New Orleans, LA | Acute Care Hospitals | 2 stars |
| University Medical Center of Princeton at Plainsboro | Plainsboro, NJ | Acute Care Hospitals | 4 stars |
| University of Cincinnati Medical Center, LLC | Cincinnati, OH | Acute Care Hospitals | 3 stars |
| University of Kansas Health System Olathe Hospital | Olathe, KS | Acute Care Hospitals | 4 stars |
| University of Louisville Hospital | Louisville, KY | Acute Care Hospitals | 1 star |
| University of Maryland Medical Center | Baltimore, MD | Acute Care Hospitals | 3 stars |
| University of MD Capital Region Medical Center | Upper Marlboro, MD | Acute Care Hospitals | 1 star |
| University of MD Charles Regional Medical Center | La Plata, MD | Acute Care Hospitals | 3 stars |
| University of MD Shore Medical Center at Easton | Easton, MD | Acute Care Hospitals | 4 stars |
| University of MD Shore Medical Ctr at Chestertown | Chestertown, MD | Acute Care Hospitals | 5 stars |
| University of MD St Joseph Medical Center | Towson, MD | Acute Care Hospitals | 5 stars |
| University of Michigan Health - West | Wyoming, MI | Acute Care Hospitals | 4 stars |
| University of Michigan Health System | Ann Arbor, MI | Acute Care Hospitals | 4 stars |
| UOFL HEALTH - JEWISH HOSPITAL and Mary & Elizabeth Hospital | Louisville, KY | Acute Care Hospitals | 2 stars |
| Uofl Health - Shelbyville Hospital | Shelbyville, KY | Acute Care Hospitals | 3 stars |
| Upland Hills Health | Dodgeville, WI | Critical Access Hospitals | 4 stars |
| UPMC Altoona | Altoona, PA | Acute Care Hospitals | 3 stars |
| UPMC Bedford Memorial | Everett, PA | Acute Care Hospitals | 4 stars |
| UPMC Carlisle | Carlisle, PA | Acute Care Hospitals | 4 stars |
| UPMC Chautauqua at Wca | Jamestown, NY | Acute Care Hospitals | 2 stars |
| UPMC Cole | Coudersport, PA | Critical Access Hospitals | 4 stars |
| UPMC East | Monroeville, PA | Acute Care Hospitals | 4 stars |
| UPMC Greene | Waynesburg, PA | Acute Care Hospitals | Not rated |
| UPMC Hamot | Erie, PA | Acute Care Hospitals | 3 stars |
| UPMC Hanover | Hanover, PA | Acute Care Hospitals | 4 stars |