Hennepin is a village located on the Illinois River in Putnam County, Illinois, United States. The population was 757 in 2010, an increase of 50 since the 2000 census. It is the county seat and second largest village in Putnam County. Hennepin is part of the Ottawa Micropolitan Statistical Area. History The Village of Hennepin was named for the explorer, Father Louis Hennepin, O. F. M. The Putnam County Courthouse, in Hennepin, was built in 1837, and is the oldest county courthouse in Illinois still serving its original purpose. Abraham Lincoln visited the courthouse, including when he campaigned for a Congressional seat in September, 1845. The Putnam County Courthouse is listed on the National Register of Historic Places. Demographics As of the census of 2000, there were 707 people, 304 households, and 206 families residing in the village. The population density was . 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. In the village, the population was spread out, with 20.8% under the age of 18, 9.2% from 18 to 24, 24.6% from 25 to 44, 27.0% from 45 to 64, and 18.4% who were 65 years of age or older. The median age was 42 years. For every 100 females, there were 96.4 males. For every 100 females age 18 and over, there were 92.4 males. The median income for a household in the village was $46,827, and the median income for a family was $56,111. Males had a median income of $48,500 versus $19,231 for females. The per capita income for the village was $23,981. About 2.6% of families and 2.9% of the population were below the poverty line, including 5.6% of those under age 18 and 2.9% of