Jacksonville is a city in Morgan County, Illinois, United States. The population was 19,446 at the 2010 census. It is the county seat of Morgan County. It is home to Illinois College, MacMurray College, Illinois School for the Deaf, and the Illinois School for the Visually Impaired.
Jacksonville is located at 39°43′55″N 90°14′4″W / 39.73194°N 90.23444°W / 39.73194; -90.23444 (39.731936, -90.234394). According to the 2010 census, Jacksonville has a total area of 10.663 square miles (27.62 km), of which 10.47 square miles (27.12 km) (or 98.19%) is land and 0.193 square miles (0.50 km) (or 1.81%) is water.
The city sits in the middle of mostly flat, fertile farmland. Mauvaisterre Creek, a small brook, runs through the middle of the city and empties into Lake Mauvaisterre, a small reservoir surrounded on three sides by parkland. Just to the south of the city lies Lake Jacksonville, a 476-acre lake with 18.6 miles of shoreline. Lake Jacksonville was named the Number One Fishing Spot in Illinois by Field and Stream Magazine.
As of the census of 2010, there were 19,446 people, 7,357 households, and 4,174 families residing in the city. The population density was 1,905 inhabitants per square mile (721.9/km²). There were 8,162 housing units at an average density of 805.5 per square mile (311.1/km²). The racial makeup of the city was 85.3% White, 10.2% African American, 0.3% Native American, 0.7% Asian, 1.1% from other races, and 2.4% from two or more races. Hispanic or Latino of any race were 3% of the population.
There were 7,357 households out of which 24.3% had children under the age of 18 living with them, 38.8% were married couples living together, 13.7% had a female householder with no husband present, and 43.3% were non-families. 36.3% of all households were made up of individuals and 13.9% had someone living alone who was 65 years of age or older. The average household size was 2.23 and the average family size was 2.88.
In the city, the population was spread out with 22.0% under the age of 18, 14.2% from 18 to 24, 25.1% from 25 to 44, 21.9% from 45 to 64, and 16.9% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 91.0 males. For every 100 females age 18 and over, there were 87.4 males.
The median income for a household in the city was $40,670, and the median income for a family was $56,343. Males had a median income of $42,409 versus $30,208 for females. The per capita income for the city was $21,245. About 11.9% of families and 18% of the population were below the poverty line, including 24.9% of those under age 18 and 11.8% of those age 65 or over.
Jacksonville Illinois neighborhoods include: Caldwell, Duncan Park, Finley Street, Hackett, Highlander Heights, Michigan Ave, Mound, SE Illinois College, Southbrooke