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-Peru, IL Micropolitan Statistical Area, which is also included in the Chicago-Naperville, IL-IN-WI Combined Statistical Area.
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