|Putnam County Illinois Cities/Towns -
Granville, Hennepin (County Seat), Magnolia, Mark, McNabb, Standard
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Putnam County is the smallest county of the U.S. state of Illinois. As of 2016, the population is 5,611. The county seat is Hennepin.
The county was formed in 1825. It is named after Israel Putnam, who was a general in the American Revolution.