Keystone is a city in Benton County, Iowa, United States. The population was 599 at the time of the 2020 census. It is part of the Cedar Rapids Metropolitan Statistical Area.

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Keystone

city in Benton County, Iowa, United States of America

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Not who you're looking for? Others named Keystone: census-designated place in Keith County, Nebraska · civil town in Bayfield County, Wisconsin · human settlement in Island County, Washington, United States · album by Dave Douglas

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