ZIP Code 61327
About Hennepin
Hennepin is a village located on the Illinois River in Putnam County, Illinois, United States. As of the 2020 census, Hennepin had a population of 769. It is the county seat and the second largest village in Putnam County.
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Area Profile
US Census (ACS 5-year · Gazetteer)
1,341
population
$87,500
median household income
37
people / sq mi
$219,000
median home value
$836
median gross rent
45.9
median age
575
housing units
524
households
36.3
land area (sq mi)