Major highways

• U.S. Highway 59
• Iowa Highway 37
• Iowa Highway 44
• Iowa Highway 173
• Iowa Highway 191
• County Highway M16
• County Highway F58
• County Highway F32
• County Highway F24
• County Highway M36

Attractions

• Shelby County Speedway

Adjacent counties

• Crawford County (north)
• Audubon County (east)
• Cass County (southeast)
• Pottawattamie County (south)
• Harrison County (west)

2020 census

The 2020 census recorded a population of 11,746 in the county, with a population density of 19.6271/sq mi (7.5781/km²). 96.51% of the population reported being of one race. 90.06% were non-Hispanic White, 0.45% were Black, 3.51% were Hispanic, 0.47% were Native American, 0.42% were Asian, 0.03% were Native Hawaiian or Pacific Islander and 5.07% were some other race or more than one race. There were 5,421 housing units, of which 4,981 were occupied.^[1]

2010 census

The 2010 census recorded a population of 12,167 in the county, with a population density of 20.5931/sq mi (7.9510/km²). There were 5,542 housing units, of which 5,085 were occupied.^[12]

2000 census

As of the census^[13] of 2000, there were 13,173 people, 5,173 households, and 3,703 families residing in the county. The population density was 22 people per square mile (8.5 people/km²). There were 5,459 housing units at an average density of 9 per square mile (3.5/km²). The racial makeup of the county was 98.68% White, 0.10% Black or African American, 0.29% Native American, 0.27% Asian, 0.18% from other races, and 0.48% from two or more races. 0.67% of the population were Hispanic or Latino of any race.

There were 5,173 households, out of which 32.60% had children under the age of 18 living with them, 62.30% were married couples living together, 6.80% had a female householder with no husband present, and 28.40% were non-families. 25.20% of all households were made up of individuals, and 13.60% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 2.99.

In the county, the population was spread out, with 26.40% under the age of 18, 5.70% from 18 to 24, 25.20% from 25 to 44, 22.40% from 45 to 64, and 20.40% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 95.90 males. For every 100 females age 18 and over, there were 93.30 males.

The median income for a household in the county was $37,442, and the median income for a family was $44,681. Males had a median income of $29,402 versus $20,296 for females. The per capita income for the county was $16,969. About 4.30% of families and 6.00% of the population were below the poverty line, including 6.00% of those under age 18 and 7.60% of those age 65 or over.

Cities

Census-designated places

• Corley
• Jacksonville

Other unincorporated places

• Botna
• Red Line
• Manteno

Townships

Population ranking

The population ranking of the following table is based on the 2020 census of Shelby County.^[1]

† county seat