Mitchellville is a city in Polk County and is partly in Jasper County in the U.S. state of Iowa. The population was 2,254 at the 2010 census.The Polk County portion of Mitchellville is part of the Des Moines–West Des Moines Metropolitan Statistical Area, while the much smaller Jasper County portion is part of the Newton Micropolitan Statistical Area.The Iowa Correctional Institution for Women is located in Mitchellville.