Kilbourne is a village in Mason County, Illinois, United States. The population was 265 at the 2020 census, down from 302 in 2010. Kilbourne is located in southern Mason County at 40°09′06″N 90°00′35″W / 40.151682°N 90.009635°W. Illinois Route 97 runs through the east side of the village, leading north 11 miles to Havana, the county seat, and so…Kilbourne is a village in Mason County, Illinois, United States. The population was 265 at the 2020 census, down from 302 in 2010. Kilbourne is located in southern Mason County at 40°09′06″N 90°00′35″W / 40.151682°N 90.009635°W. Illinois Route 97 runs through the east side of the village, leading north 11 miles to Havana, the county seat, and southeast 14 miles to Petersburg.
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