Marshall County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 12,640. Its county seat is Lacon. Marshall County is part of the Peoria, IL Metropolitan Statistical Area.
According to the U.S. Census Bureau, the county has a total area of 399 square miles (1,030 km²), of which 387 square miles (1,000 km²) is land and 12 square miles (31 km²) (2.9%) is water.
As of the 2010 United States Census, there were 12,640 people, 5,161 households, and 3,549 families residing in the county. The population density was 32.7 inhabitants per square mile (12.6/km²). There were 5,914 housing units at an average density of 15.3 per square mile (5.9/km²).
The racial makeup of the county was 97.1% white, 0.4% Asian, 0.3% black or African American, 0.2% American Indian, 1.1% from other races, and 0.9% from two or more races. Those of Hispanic or Latino origin made up 2.5% of the population. In terms of ancestry, 43.0% were German, 16.7% were Irish, 14.4% were English, 7.2% were Italian, 6.2% were American, and 6.1% were Polish.
Of the 5,161 households, 27.4% had children under the age of 18 living with them, 56.7% were married couples living together, 7.7% had a female householder with no husband present, 31.2% were non-families, and 26.8% of all households were made up of individuals. The average household size was 2.40 and the average family size was 2.88. The median age was 44.8 years.
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