Harmon is a village in Lee County, Illinois, United States. The population was 120 at the 2010 census, down from 149 in 2000. Harmon is located at 41°43′14″N 89°33′19″W / 41.72056°N 89.55528°W. According to the 2010 census, Harmon has a total area of 0.15 square miles, all land.
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