Johnson County, Illinois

Climate and weather

In recent years, average temperatures in the county seat of Vienna have ranged from a low of 25 °F (−4 °C) in January to a high of 90 °F (32 °C) in July, although a record low of −20 °F (−29 °C) was recorded in January 1977 and a record high of 103 °F (39 °C) was recorded in August 2007. Average monthly precipitation ranged from 3.16 inches (80 mm) in October to 5.16 inches (131 mm) in May.^[5]

Major highways

• Interstate 24
• Interstate 57
• U.S. Route 45
• Illinois Route 37
• Illinois Route 146
• Illinois Route 147
• Illinois Route 166

Transit

• List of intercity bus stops in Illinois

Adjacent counties

• Williamson County - north
• Saline County - northeast
• Pope County - east
• Massac County - southeast
• Pulaski County - southwest
• Union County - west

National protected areas

• Cypress Creek National Wildlife Refuge (part)
• Shawnee National Forest (part)

2020 census

As of the 2020 census, the county had a population of 13,308. The median age was 42.8 years, 17.4% of residents were under the age of 18, and 20.1% of residents were 65 years of age or older. For every 100 females there were 142.4 males, and for every 100 females age 18 and over there were 151.7 males age 18 and over.^[13]

The racial makeup of the county was 82.5% White, 10.8% Black or African American, 0.2% American Indian and Alaska Native, 0.2% Asian, <0.1% Native Hawaiian or Pacific Islander, 3.1% from some other race, and 3.2% from two or more races. Hispanic or Latino residents of any race comprised 4.1% of the population.^[14]

Less than 0.1% of residents lived in urban areas, while 100.0% lived in rural areas.^[15]

There were 4,577 households in the county, of which 26.8% had children under the age of 18 living in them. Of all households, 53.2% were married-couple households, 17.5% were households with a male householder and no spouse or partner present, and 23.7% were households with a female householder and no spouse or partner present. About 27.6% of all households were made up of individuals and 14.8% had someone living alone who was 65 years of age or older.^[13]

There were 5,526 housing units, of which 17.2% were vacant. Among occupied housing units, 81.6% were owner-occupied and 18.4% were renter-occupied. The homeowner vacancy rate was 2.1% and the rental vacancy rate was 8.4%.^[13]

Racial and ethnic composition

2010 census

As of the 2010 census, there were 12,582 people, 4,584 households, and 3,270 families residing in the county.^[25] The population density was 36.6 inhabitants per square mile (14.1/km²). There were 5,598 housing units at an average density of 16.3 per square mile (6.3/km²).^[4]

The racial makeup of the county was 89.0% white, 8.0% black or African American, 0.2% Asian, 0.2% American Indian, 0.0% Native Hawaiian or Pacific Islander, 1.6% from other races, and 1.0% from two or more races. Those of Hispanic or Latino origin made up 3.0% of the population.^[25]

In terms of ancestry, 17.6% were German, 11.5% were Irish, 10.9% were English, and 6.5% were American.^[26]

Of the 4,584 households, 28.8% had children under the age of 18 living with them, 59.2% were married couples living together, 8.3% had a female householder with no husband present, 28.7% were non-families, and 25.3% of all households were made up of individuals. The average household size was 2.41 and the average family size was 2.85. The median age was 42.2 years.^[25]

The median income for a household in the county was $41,619 and the median income for a family was $47,423. Males had a median income of $48,047 versus $30,904 for females. The per capita income for the county was $16,402, the lowest of all 102 counties in Illinois and 57th in the U.S. About 11.1% of families and 13.6% of the population were below the poverty line, including 19.0% of those under age 18 and 10.7% of those age 65 or over.^[27]

Cities

• Marion (mostly in Williamson County)
• Vienna

Villages

• Belknap
• Buncombe
• Cypress
• Goreville
• New Burnside
• Simpson

Unincorporated communities