Hennepin is a village on the Illinois River in Putnam County, Illinois, United States. The population was 757 at the 2010 census, up from 707 in 2000. It is the county seat of Putnam County. Hennepin is part of the Ottawa–Streator Micropolitan Statistical Area.
As of the census of 2000, there were 707 people, 304 households, and 206 families residing in the village. The population density was 135.4 people per square mile (52.3/km²). There were 334 housing units at an average density of 64.0 per square mile #24.7/km²#. The racial makeup of the village was 97.17% White, 1.13% African American, 0.28% Native American, 0.71% Asian, 0.57% from other races, and 0.14% from two or more races. Hispanic or Latino of any race were 3.82% of the population.
There were 304 households out of which 26.6% had children under the age of 18 living with them, 59.2% were married couples living together, 5.6% had a female householder with no husband present, and 32.2% were non-families. 30.3% of all households were made up of individuals and 16.1% had someone living alone who was 65 years of age or older. The average household size was 2.32 and the average family size was 2.87.
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