Johnston is located in Polk County, IA. The population is 17,316, making Johnston the 5th largest city in Polk County.
There are 8 public schools in Johnston with an average Homefacts rating of A+. The total crime rate for Johnston is very low , and there are 11 registered sex offenders residing in the city. Unemployment in Johnston is low and the median home sales price is $0. Detailed and up-to-date Johnston property reports are available for any property address.
Cities near Johnston include Webster Township, Jefferson Township and Saylorville.