| Northeast Regional Medical Center | Kirksville, MO | Acute Care Hospitals | 2 stars |
| Northeastern Nevada Regional Hospital | Elko, NV | Acute Care Hospitals | 3 stars |
| Northern Louisiana Medical Center | Ruston, LA | Acute Care Hospitals | 2 stars |
| Northwest Health - Porter | Valparaiso, IN | Acute Care Hospitals | 2 stars |
| Northwest Health - Starke | Knox, IN | Acute Care Hospitals | 1 star |
| Northwest Medical Center | Tucson, AZ | Acute Care Hospitals | 2 stars |
| Northwest Medical Center-Springdale | Springdale, AR | Acute Care Hospitals | 3 stars |
| Northwest Missississippi Regional Medical Center | Clarksdale, MS | Acute Care Hospitals | 3 stars |
| Northwest Specialty Hospital | Post Falls, ID | Acute Care Hospitals | Not rated |
| Norton Scott Hospital | Scottsburg, IN | Critical Access Hospitals | 2 stars |
| Norwood Hospital | Norwood, MA | Acute Care Hospitals | Not rated |
| Novant Health East Cooper Medical Center | Mount Pleasant, SC | Acute Care Hospitals | 4 stars |
| Oakdale Community Hospital | Oakdale, LA | Acute Care Hospitals | 3 stars |
| Oakwood Springs, LLC | Oklahoma City, OK | Psychiatric | Not rated |
| Oasis Behavioral Health Hospital | Chandler, AZ | Psychiatric | Not rated |
| Ocean View Psychiatric Health Facility | Long Beach, CA | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Permian Basin | Midland, TX | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Abilene | Abilene, TX | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Alexandria | Alexandria, LA | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Amarillo | Amarillo, TX | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Baton Rouge | Baton Rouge, LA | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Corpus Christi | Corpus Christi, TX | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Deridder | Deridder, LA | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Greater New Orleans | Kenner, LA | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Jackson | Jackson, MS | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Katy | Katy, TX | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Kentwood | Kentwood, LA | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Lake Charles | Lake Charles, LA | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Longview | Longview, TX | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Lubbock | Lubbock, TX | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Lufkin LLC | Lufkin, TX | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Opelousas | Opelousas, LA | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Pasadena | Pasadena, TX | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Tupelo | Tupelo, MS | Psychiatric | Not rated |
| Oceans Behavioral Hospital of Waco | Waco, TX | Psychiatric | Not rated |
| Oceans Behavioral Hospital- Biloxi | Biloxi, MS | Psychiatric | Not rated |
| Oceans Hospital of Broussard | Broussard, LA | Psychiatric | Not rated |
| Odessa Regional Medical Center | Odessa, TX | Acute Care Hospitals | 3 stars |
| Ogden Regional Medical Center | Ogden, UT | Acute Care Hospitals | 3 stars |
| Ohio County Hospital | Hartford, KY | Critical Access Hospitals | 2 stars |
| Ohio Hospital for Psychiatry | Columbus, OH | Psychiatric | Not rated |
| Old Vineyard Youth Services | Winston Salem, NC | Psychiatric | Not rated |
| Olean General Hospital | Olean, NY | Acute Care Hospitals | 1 star |
| Onecore Health | Oklahoma City, OK | Acute Care Hospitals | Not rated |
| Optim Medical Center - Screven | Sylvania, GA | Critical Access Hospitals | Not rated |
| Optim Medical Center - Tattnall | Reidsville, GA | Critical Access Hospitals | Not rated |
| Orange County Global Medical Center | Santa Ana, CA | Acute Care Hospitals | 2 stars |
| Orlando Health St Cloud Hospital | Saint Cloud, FL | Acute Care Hospitals | 2 stars |
| Oro Valley Hospital | Oro Valley, AZ | Acute Care Hospitals | 3 stars |
| Orthocolorado Hosp at St Anthony Med Campus | Lakewood, CO | Acute Care Hospitals | Not rated |