Lacon is a city in, and the county seat of, Marshall County, Illinois, United States. It is part of the Peoria, Illinois Metropolitan Statistical Area. The population was 1,937 at the 2010 census, down from 1,979 in 2000. Lacon was named after Laconia, a region of Greece. Lacon was established in 1831.
Lacon is located at 41°01′26″N 89°24′28″W. It is situated on the east shoreline of the Illinois River. According to the 2010 census, Lacon has a total area of 1.641 square miles (4.25 km²), of which 1.6 square miles (4.14 km²) (or 97.5%) is land and 0.041 square miles (0.11 km²) (or 2.5%) is water.
As of the census of 2000, there were 1,979 people, 797 households, and 540 families residing in the city. The population density was 1,233.9 people per square mile (477.6/km²). There were 852 housing units at an average density of 531.2 per square mile (205.6/km²). The racial makeup of the city was 80.09% White, 7.10% African American, 0.10% Native American, 0.20% Asian, 0.10% from other races, and 0.40% from two or more races. Hispanic or Latino of any race were 12.91% of the population.
There were 797 households out of which 28.1% had children under the age of 18 living with them, 55.6% were married couples living together, 7.9% had a female householder with no husband present, and 32.2% were non-families. 28.6% of all households were made up of individuals and 15.4% 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 2.87.
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