Healthcare Insights

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

RankDefinitive IDHospital nameCityState# of ORsExplore dataset
13120Cleveland Clinic Main CampusClevelandOH85Explore
24012Houston Methodist HospitalHoustonTX78Explore
31973Massachusetts General HospitalBostonMA70Explore
32066Beaumont Hospital - Royal OakRoyal OakMI70Explore
32191Mayo Clinic Hospital - Saint Marys CampusRochesterMN70Explore
62442Barnes-Jewish HospitalSaint LouisMO65Explore
73572Thomas Jefferson University HospitalPhiladelphiaPA62Explore
82837Mount Sinai Medical CenterNew YorkNY58Explore
92973Duke University HospitalDurhamNC54Explore
91135Northwestern Memorial HospitalChicagoIL54Explore
111219McDonough District HospitalMacombIL46Explore
125533Regency Hospital of ToledoSylvaniaOH45Explore
131969Brigham and Womens HospitalBostonMA44Explore
14541977NewYork-Presbyterian Komansky Childrens HospitalNew YorkNY43Explore
15718Hartford HospitalHartfordCT42Explore
153766Erlanger Baroness HospitalChattanoogaTN42Explore
172976Wake Forest Baptist Medical CenterWinston SalemNC40Explore
173519Lancaster General HospitalLancasterPA40Explore
172192Mayo Clinic Hospital - Methodist CampusRochesterMN40Explore
203571Hospital of the University of PennsylvaniaPhiladelphiaPA39Explore
202625Dartmouth-Hitchcock Medical CenterLebanonNH39Explore
204018Memorial Hermann - Texas Medical CenterHoustonTX39Explore
204271Inova Fairfax HospitalFalls ChurchVA39Explore
20274150Childrens Memorial Hermann HospitalHoustonTX39Explore
211461University of Iowa Hospitals & ClinicsIowa CityIA38Explore

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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