Dike is a city in Grundy County, Iowa, United States. The population was 1,304 at the 2020 census, an increase of 38% over the total of 944 re…Dike is a city in Grundy County, Iowa, United States. The population was 1,304 at the 2020 census, an increase of 38% over the total of 944 residents in 2000. It is part of the Waterloo–Cedar Falls Metropolitan Statistical Area.
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