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Not who you're looking for? Others named Putnam County: county in West Virginia, United States · county in Tennessee, United States · county in Georgia, United States · county in Florida, United States
Putnam County is the least extensive county in the U.S. state of Illinois. According to the 2020 United States census, it had a population of 5,637. 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.