St. John's Health System serves the 1.3 million residents in Southwest Missouri and Northern Arkansas. A fully-integrated health system, St. John's draws upon the talents of more than 10,000 co-workers, 460 physicians and 1,100 volunteers. We are also a member of the Sisters of Mercy Health System-St. Louis, the 9th-largest Catholic health system in the country. In 2009, St. John's celebrated a prestigious repeat of our #1 ranking among the Nation's Integrated Health Systems.