Geneseo is a city in Henry County, Illinois, United States. The population was 6,586 at the 2010 census, up from 6,480 in 2000. Geneseo is 20 miles east of the Quad Cities, at the intersection of Interstate 80, U.S. Route 6 and Illinois Route 82.
According to the 2010 census, Geneseo has a total area of 4.398 square miles (11.39 km), of which 4.39 square miles (11.37 km) (or 99.82%) is land and 0.008 square miles (0.02 km) (or 0.18%) is water.
As of the census of 2000, there were 6,480 people, 2,707 households, and 1,810 families residing in the city. The population density was 1,607.0 people per square mile (620.8/km²). There were 2,854 housing units at an average density of 707.8 per square mile (273.4/km²). The racial makeup of the city was 98.56% White, 0.19% African American, 0.09% Native American, 0.35% Asian, 0.02% Pacific Islander, 0.28% from other races, and 0.51% from two or more races. Hispanic or Latino of any race were 0.94% of the population.
There were 2,707 households out of which 30.0% had children under the age of 18 living with them, 56.3% were married couples living together, 7.6% had a female householder with no husband present, and 33.1% were non-families. 30.7% of all households were made up of individuals and 18.7% had someone living alone who was 65 years of age or older. The average household size was 2.35 and the average family size was 2.94.
In the city, the population was spread out with 24.4% under the age of 18, 6.0% from 18 to 24, 25.4% from 25 to 44, 23.0% from 45 to 64, and 21.3% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 89.4 males. For every 100 females age 18 and over, there were 84.0 males.
The median income for a household in the city was $40,760, and the median income for a family was $51,455. Males had a median income of $38,990 versus $22,794 for females. The per capita income for the city was $20,115. About 3.3% of families and 5.3% of the population were below the poverty line, including 4.3% of those under age 18 and 6.7% of those age 65 or over.