Putnam County is the least extensive county in the U.S. state of Illinois. According to the 2010 census, it had a population of 6,006. The county seat is Hennepin. The county was formed in 1825 out of Fulton County and named after Israel Putnam, who was a general in the American Revolution.
Putnam County is part of the Ottawa, IL Micropolitan Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 172 square miles , of which 160 square miles is land and 12 square miles is water. It is the smallest county in Illinois by area.
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