Top 25 U.S. hospitals with the most operating rooms

Operating rooms (ORs) are among hospitals’ most critical resources, as they provide the space and equipment necessary to perform surgeries and other intensive procedures.

While operating room square footage delivers a more granular metric for determining a healthcare facility’s size and overall capacity for complex procedures, a facility’s total number of ORs can indicate its ability to handle multiple operations simultaneously.

Below, we’ve compiled a list of the top 25 hospitals in the U.S. with the greatest number of ORs.

25 hospitals by total number of operating rooms

Rank Definitive ID Hospital Name City State # of ORs
1 3120 Cleveland Clinic Main Campus Cleveland OH 85
2 4012 Houston Methodist Hospital Houston TX 78
3 1973 Massachusetts General Hospital Boston MA 70
3 2066 Beaumont Hospital - Royal Oak Royal Oak MI 70
3 2191 Mayo Clinic Hospital - Saint Marys Campus Rochester MN 70
6 2442 Barnes-Jewish Hospital Saint Louis MO 65
7 3572 Thomas Jefferson University Hospital Philadelphia PA 62
8 2837 Mount Sinai Medical Center New York NY 58
9 2973 Duke University Hospital Durham NC 54
9 1135 Northwestern Memorial Hospital Chicago IL 54
11 1219 McDonough District Hospital Macomb IL 46
12 5533 Regency Hospital of Toledo Sylvania OH 45
13 1969 Brigham and Womens Hospital Boston MA 44
14 541977 NewYork-Presbyterian Komansky Childrens Hospital New York NY 43
15 718 Hartford Hospital Hartford CT 42
15 3766 Erlanger Baroness Hospital Chattanooga TN 42
17 2976 Wake Forest Baptist Medical Center Winston Salem NC 40
17 3519 Lancaster General Hospital Lancaster PA 40
17 2192 Mayo Clinic Hospital - Methodist Campus Rochester MN 40
20 3571 Hospital of the University of Pennsylvania Philadelphia PA 39
20 2625 Dartmouth-Hitchcock Medical Center Lebanon NH 39
20 4018 Memorial Hermann - Texas Medical Center Houston TX 39
20 4271 Inova Fairfax Hospital Falls Church VA 39
20 274150 Childrens Memorial Hermann Hospital Houston TX 39
21 1461 University of Iowa Hospitals & Clinics Iowa City IA 38

Fig. 1 Data is from Definitive Healthcare’s HospitalView database. Data accessed August 2022.

Which U.S. hospital has the most operating rooms?

The Cleveland Clinic Main Campus in Ohio has 85 ORs, putting it at the top of our list and about 8% ahead of the hospital with the second-greatest number of ORs: Houston Methodist Hospital in Texas, with 78 ORs.

Third place is a three-way tie between Massachusetts General Hospital in Boston, Beaumont Hospital – Royal Oak in Michigan, and Mayo Clinic Hospital – Saint Marys Campus in Rochester, Minnesota, each with 70 ORs.

Together, the 25 hospitals featured on our list have 1,281 ORs. The average number of ORs per hospital is just over 51.

What are the three types of operating rooms?

Every OR is designed with different specifications to meet the unique needs of a hospital and the population it serves. However, ORs are broadly divided into one of three types: digital, hybrid and integrated.

Digital ORs are built around a central data system that integrates imaging, software, and video data systems. These ORs enable simpler sharing, transfer, and collection of medical data, which may be referenced during the operation or used afterward to assess outcomes and inform care plans.

Hybrid ORs bring together surgical equipment and medical imaging devices, supporting minimally invasive surgical procedures without the need to transfer the patient to another room for imaging. Hybrid ORs are equipped for most surgical disciplines but are generally best suited to those requiring high-resolution imaging of smaller body parts, such as cardiovascular or neurological surgery.

Integrated ORs feature functionally integrated surgical systems that combine lighting, audio, video and operating equipment in a single, centrally controlled unit. This integration improves surgical efficiency by eliminating the need to move equipment to and from the operating table during the course of a procedure.

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