Major highways

• Interstate 29
• Iowa Highway 37
• Iowa Highway 141
• Iowa Highway 175
• Iowa Highway 183

Adjacent counties

• Woodbury County (north)
• Crawford County (east)
• Harrison County (south)
• Burt County, Nebraska (southwest)
• Thurston County, Nebraska (west)

2020 census

The 2020 census recorded a population of 8,751 in the county, with a population density of 12.5221/sq mi (4.83481/km²). 96.03% of the population reported being of one race. 90.33% were non-Hispanic White, 0.32% were Black, 2.70% were Hispanic, 1.67% were Native American, 0.32% were Asian, 0.02% were Native Hawaiian or Pacific Islander and 4.64% were some other race or more than one race. There were 4,373 housing units, of which 3,839 were occupied.^[1]

2010 census

The 2010 census recorded a population of 9,243 in the county, with a population density of 13.3354/sq mi (5.14881/km²). There were 4,697 housing units, of which 4,050 were occupied.^[16]

2000 census

As of the census^[17] of 2000, there were 10,020 people, 4,211 households, and 2,737 families residing in the county. The population density was 14 people per square mile (5.4 people/km²). There were 4,660 housing units at an average density of 7 units per square mile (2.7 units/km²). The racial makeup of the county was 98.34% White, 0.08% Black or African American, 0.76% Native American, 0.12% Asian, 0.04% Pacific Islander, 0.08% from other races, and 0.58% from two or more races. 0.70% of the population were Hispanic or Latino of any race.

There were 4,211 households, out of which 26.70% had children under the age of 18 living with them, 54.50% were married couples living together, 7.10% had a female householder with no husband present, and 35.00% were non-families. 31.00% of all households were made up of individuals, and 17.50% had someone living alone who was 65 years of age or older. The average household size was 2.31 and the average family size was 2.88.

In the county, the population was spread out, with 23.20% under the age of 18, 6.20% from 18 to 24, 23.30% from 25 to 44, 23.30% from 45 to 64, and 23.90% who were 65 years of age or older. The median age was 43 years. For every 100 females, there were 94.20 males. For every 100 females age 18 and over, there were 90.50 males.

The median income for a household in the county was $33,235, and the median income for a family was $41,172. Males had a median income of $27,349 versus $19,607 for females. The per capita income for the county was $17,477. About 6.60% of families and 9.40% of the population were below the poverty line, including 8.90% of those under age 18 and 9.50% of those age 65 or over.

Unincorporated communities

Ticonic

Townships

Population ranking

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

† county seat