MercyOne Medical Group - Central Iowa is one of Iowa's largest multispecialty clinic systems, made up of more than 50 primary care, pediatric, internal medicine and specialty clinics located throughout Dallas, Jasper, Polk, Wapello, Warren and Webster counties. MercyOne Des Moines Medical Center, founded by the Sisters of Mercy in 1893, is the longest continually operating hospital in Des Moines and Iowa's largest medical center, with 802 beds available.