Keystone is located in Benton County, IA. The population is 638, making Keystone the 9th largest city in Benton County.
There are 1 public schools in Keystone with an average Homefacts rating of B+. The total crime rate for Keystone is low , and there are 2 registered sex offenders residing in the city. Unemployment in Keystone is moderate and the median home sales price is $0. Detailed and up-to-date Keystone property reports are available for any property address.
Cities near Keystone include Kane Township, Union Township and Van Horne.