| OAK TREE HOSPITAL | LAGRANGE | KY | 25 |
| OAK TREE HOSPITAL AT BAPTIST REGIONA | CORBIN | KY | 25 |
| OAK VALLEY DISTRICT HOSPITAL | OAKDALE | CA | 35 |
| OAKBEND MEDICAL CENTER | RICHMOND | TX | 155 |
| OAKDALE COMMUNITY HOSPITAL | OAKDALE | LA | 37 |
| OAKES COMMUNITY HOSPITAL | OAKES | ND | 25 |
| OAKLAND MEMORIAL HOSPITAL | OAKLAND | NE | 23 |
| OAKLAWN HOSPITAL | MARSHALL | MI | 71 |
| OAKWOOD DOWNRIVER MEDICAL CENTER | LINCOLN PARK | MI | 50 |
| OASIS HOSPITAL | PHOENIX | AZ | 64 |
| OBLENESS MEMORIAL HOSPITAL | ATHENS | OH | 67 |
| OCEAN BEACH HOSPITAL | ILWACO | WA | 15 |
| OCHILTREE GENERAL HOSPITAL | PERRYTON | TX | 49 |
| OCHSNER AMERICAN LEGION HOSPITAL | JENNINGS | LA | 49 |
| OCHSNER BAPTIST MEDICAL CENTER | NEW ORLEANS | LA | 83 |
| OCHSNER CLINIC FOUNDATION | NEW ORLEANS | LA | 946 |
| OCHSNER LSU HEALTH - ST MARY MED CTR | SHREVEPORT | LA | 109 |
| OCHSNER LSU HEALTH MONROE | MONROE | LA | 87 |
| OCHSNER LSU HEALTH SHREVEPORT | SHREVEPORT | LA | 243 |
| OCHSNER MED CTR - HANCOCK | BAY ST. LOUIS | MS | 41 |
| OCHSNER MEDICAL CENTER - BATON ROUGE | BATON ROUGE | LA | 155 |
| OCHSNER MEDICAL CENTER - KENNER LLC | KENNER | LA | 117 |
| OCHSNER MEDICAL CENTER - WESTBANK | GRETNA | LA | 180 |
| OCHSNER MEDICAL CENTER -NORTHSHORE | SLIDELL | LA | 150 |
| OCHSNER RUSH MEDICAL CENTER | MERIDIAN | MS | 191 |
| OCHSNER ST. MARY | MORGAN CITY | LA | 60 |
| OCONEE MEMORIAL HOSPITAL | SENECA | SC | 130 |
| OCONNOR HOSPITAL | SAN JOSE | CA | 324 |
| OCONOMOWOC MEMORIAL HOSPITAL | OCONOMOWOC | WI | 63 |
| OCONTO MEMORIAL HOSPITAL | OCONTO | WI | 25 |
| ODESSA MEMORIAL HOSPITAL | ODESSA | WA | 21 |
| ODESSA REGIONAL HOSPITAL | ODESSA | TX | 208 |
| OGALLALA COMMUNITY HOSPITAL | OGALLALA | NE | 18 |
| OGDEN REGIONAL MEDICAL CENTER | OGDEN | UT | 174 |
| OHIO COUNTY HOSPITAL | HARTFORD | KY | 49 |
| OHIO STATE UNIVERSITY HOSPITALS EAST | COLUMBUS | OH | 174 |
| OHIO VALLEY GENERAL HOSPITAL | WHEELING | WV | 119 |
| OHIO VALLEY MEDICAL CENTER | SPRINGFIELD | OH | 24 |
| OHSU HOSPITAL AND CLINICS | PORTLAND | OR | 562 |
| OJAI VALLEY COMMUNITY HOSPITAL | OJAI | CA | 37 |
| OK CENTER FOR ORTHOPEDIC & MULTI | OKALHOMA CITY | OK | 9 |
| OKANOGAN-DOUGLAS COUNTY HOSPITAL | BREWSTER | WA | 43 |
| OKEENE MUNICIPAL HOSPITAL | OKEENE | OK | 30 |
| OKLAHOMA HEART HOSPITAL | OKLAHOMA CITY | OK | 97 |
| OKLAHOMA HEART HOSPITAL SOUTH | OKLAHOMA CITY | OK | 44 |
| OKLAHOMA SPINE HOSPITAL | OKLAHOMA CITY | OK | 23 |
| OKLAHOMA SURGICAL HOSPITAL | TULSA | OK | 74 |
| OKTIBBEHA COUNTY HOSPITAL | STARKVILLE | MS | 88 |
| OLATHE MEDICAL CENTER | OLATHE | KS | 227 |
| OLMSTED MEDICAL CENTER | ROCHESTER | MN | 61 |
| OLNEY HAMILTON HOSPITAL DISTRICT | OLNEY | TX | 45 |
| OLYMPIA MEDICAL CENTER | LOS ANGELES | CA | 204 |
| OLYMPIC MEDICAL CENTER | PORT ANGELES | WA | 78 |
| OMEGA HOSPITAL LLC | METAIRIE | LA | 10 |
| ONECORE HEALTH | OKLAHOMA CITY | OK | 7 |
| ONEIDA COUNTY HOSPITAL | MALAD CITY | ID | 14 |
| ONEIDA HEALTH | ONEIDA | NY | 101 |
| ONSLOW MEMORIAL HOSPITAL | JACKSONVILLE | NC | 162 |
| ONTONAGON MEMORIAL HOSPITAL | ONTONAGON | MI | 38 |
| OPELOUSAS GENERAL HOSPITAL | OPELOUSAS | LA | 141 |
| ORANGE CITY MUNICIPAL HOSPITAL | ORANGE CITY | IA | 30 |
| ORANGE COUNTY GLOBAL MEDICAL CENTER | SANTA ANA | CA | 254 |
| OREM COMMUNITY HOSPITAL | OREM | UT | 24 |
| ORLANDO HEALTH | ORLANDO | FL | 1,544 |
| ORLANDO HEALTH BAYFRONT HOSPITAL | ST PETERSBURG | FL | 292 |
| ORLANDO HEALTH MELBOURNE HOSPITAL | MELBOURNE | FL | 119 |
| ORLANDO HEALTH SOUTH LAKE HOSPITAL | CLERMONT | FL | 239 |
| ORLANDO HEALTH-HEALTH CENTRAL HOSPIT | OCOEE | FL | 283 |
| OROVILLE HOSPITAL | OROVILLE | CA | 133 |
| ORTHOCOLORADO HOSPITAL | LAKEWOOD | CO | 48 |
| ORTHOPAEDIC HOSPITAL | LOS ANGELES | CA | 112 |
| ORTHOPAEDIC HOSPITAL OF WISCONSIN | GLENDALE | WI | 30 |
| ORTHOPAEDIC HOSPT.AT PARKVIEW | FORT WAYNE | IN | 37 |
| ORTHOPEDIC SPECIALTY HOSPITAL | LAS VEGAS | NV | 130 |
| ORTONVILLE AREA HEALTH SERVICES | ORTONVILLE | MN | 31 |
| OSBORNE COUNTY MEMORIAL HOSPITAL | OSBORNE | KS | 29 |
| OSCEOLA COMMUNITY HOSPITAL | SIBLEY | IA | 32 |
| OSCEOLA REGIONAL MEDICAL CENTER | KISSIMMEE | FL | 345 |
| OSF HEART OF MARY MEDICAL CENTER | URBANA | IL | 97 |
| OSF SACRED HEART MEDICAL CENTER | DANVILLE | IL | 100 |
| OSF SAINT ANTHONYS HEALTH CENTER | ALTON | IL | 49 |
| OSF SAINT KATHARINE MEDICAL CENTER | DIXON | IL | 80 |
| OSMOND GENERAL HOSPITAL | OSMOND | NE | 37 |
| OSS ORTHOPAEDIC HOSPITAL | YORK | PA | 30 |
| OSSEO AREA HOSPITAL & NURSING HOME | OSSEO | WI | 42 |
| OSTEOPATHIC MEDICAL CENTER | FORT WORTH | TX | 157 |
| OSU MEDICAL CENTER | TULSA | OK | 143 |
| OSWEGO HOSPITAL | OSWEGO | NY | 132 |
| OTHELLO COMMUNITY HOSPITAL | OTHELLO | WA | 26 |
| OTSEGO MEMORIAL HOSPITAL | GAYLORD | MI | 46 |
| OTTAWA COUNTY HEALTH CENTER | MINNEAPOLIS | KS | 25 |
| OTTAWA REGIONAL HOSPITAL & HEALTHCAR | OTTAWA | IL | 116 |
| OTTO KAISER MEMORIAL HOSPITAL | KENEDY | TX | 29 |
| OTTUMWA REGIONAL HEALTH CENTER | OTTUMWA | IA | 76 |
| OU MEDICAL CENTER | OKLAHOMA CITY | OK | 853 |
| OUACHITA COMMUNITY HOSPITAL | WEST MONROE | LA | 10 |
| OUACHITA COUNTY MEDICAL CENTER | CAMDEN | AR | 50 |
| OUR LADY OF BELLEFONTE | ASHLAND | KY | 135 |
| OUR LADY OF FATIMA HOSPITAL | NORTH PROVIDENCE | RI | 185 |
| OUR LADY OF LOURDES HOSPITAL | NORFOLK | NE | 100 |