Marshall County, Illinois

Climate and weather

In recent years, average temperatures in the county seat of Lacon have ranged from a low of 15 °F (−9 °C) in January to a high of 87 °F (31 °C) in July, although a record low of −27 °F (−33 °C) was recorded in January 1999 and a record high of 103 °F (39 °C) was recorded in July 2005. Average monthly precipitation ranged from 1.55 inches (39 mm) in January to 4.20 inches (107 mm) in May.^[5]

Major highways

Adjacent counties

• Bureau County - northwest
• Putnam County - north
• LaSalle County - east
• Woodford County - south
• Peoria County - southwest
• Stark County - west

National protected area

• Chautauqua National Wildlife Refuge (part)

2020 census

As of the 2020 census, the county had a population of 11,742. The median age was 46.2 years. 20.8% of residents were under the age of 18 and 23.9% of residents were 65 years of age or older. For every 100 females there were 98.8 males, and for every 100 females age 18 and over there were 98.4 males age 18 and over.^[12][13]

The racial makeup of the county was 93.4% White, 0.7% Black or African American, 0.3% American Indian and Alaska Native, 0.4% Asian, <0.1% Native Hawaiian and Pacific Islander, 0.9% from some other race, and 4.3% from two or more races. Hispanic or Latino residents of any race comprised 2.8% of the population.^[13]

<0.1% of residents lived in urban areas, while 100.0% lived in rural areas.^[14]

There were 4,982 households in the county, of which 25.3% had children under the age of 18 living in them. Of all households, 49.0% were married-couple households, 19.7% were households with a male householder and no spouse or partner present, and 23.5% were households with a female householder and no spouse or partner present. About 30.6% of all households were made up of individuals and 15.4% had someone living alone who was 65 years of age or older.^[12]

There were 5,819 housing units, of which 14.4% were vacant. Among occupied housing units, 79.8% were owner-occupied and 20.2% were renter-occupied. The homeowner vacancy rate was 2.4% and the rental vacancy rate was 9.6%.^[12]

Racial and ethnic composition

2010 census

As of the 2010 United States census, there were 12,640 people, 5,161 households, and 3,549 families living in the county.^[24] 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).^[4] 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.^[24] 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.^[25]

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.^[24]

The median income for a household in the county was $49,116 and the median income for a family was $64,781. Males had a median income of $46,793 versus $28,549 for females. The per capita income for the county was $24,991. About 6.8% of families and 9.5% of the population were below the poverty line, including 11.4% of those under age 18 and 7.0% of those age 65 or over.^[26]

Cities

• Henry
• Lacon
• Toluca
• Wenona

Villages

• Hopewell
• La Rose
• Sparland
• Varna
• Washburn

Unincorporated communities

Townships