Putnam County is the least extensive county in the U.S. state of Illinois. According to the 2020 census, it had a population of 5,637.[1] The county seat is Hennepin.[2] The county was founded in 1825 and named after Israel Putnam,[3] who was a general in the American Revolution.
- ↑ "QuickFacts: Putnam County, Illinois". United States Census Bureau. Retrieved August 11, 2023.
- ↑ "Find a County". National Association of Counties. Retrieved 2011-06-07.
- ↑ "About Putnam County". Putnam County, Illinois. Archived from the original on 2013-02-22. Retrieved 2012-07-27.