Hartwick is a city in Poweshiek County, Iowa, United States. The population was 92 at the time of the 2020 census. Hartwick is locateā¦Hartwick is a city in Poweshiek County, Iowa, United States. The population was 92 at the time of the 2020 census. Hartwick is located at 41°47ā²7ā³N 92°20ā²39ā³W / 41.78528°N 92.34417°W. According to the United States Census Bureau, the city has a total area of 0.13 square miles, all land.
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