Cornell is a village in Livingston County, Illinois, United States. The population was 511 at the 2000 census. It is a part of the geographic region known as Streatorland.
Cornell is located at 40°59′27″N 88°43′47″W / 40.990817°N 88.729832°W / 40.990817; -88.729832.
According to the 2010 census, Cornell has a total area of 0.64 square miles (1.66 km), all land.
As of the census of 2000, there were 511 people, 205 households, and 142 families residing in the village. The population density was 803.8 people per square mile (308.3/km²). There were 217 housing units at an average density of 341.3 per square mile (130.9/km²). The racial makeup of the village was 98.83% White, 0.39% African American, 0.78% from other races. Hispanic or Latino of any race were 1.57% of the population.
There were 205 households out of which 32.2% had children under the age of 18 living with them, 54.1% were married couples living together, 8.8% had a female householder with no husband present, and 30.7% were non-families. 28.3% of all households were made up of individuals and 14.1% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 3.06.
In the village, the population was spread out with 26.2% under the age of 18, 9.6% from 18 to 24, 23.3% from 25 to 44, 27.8% from 45 to 64, and 13.1% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 93.6 males. For every 100 females age 18 and over, there were 92.3 males.
The median income for a household in the village was $45,313, and the median income for a family was $51,429. Males had a median income of $39,375 versus $17,273 for females. The per capita income for the village was $18,655. About 8.3% of families and 8.8% of the population were below the poverty line, including 12.7% of those under age 18 and 11.6% of those age 65 or over.