As of the 2010 United States Census, there were 19,840 people, 7,872 households, and 5,416 families in the county.
The population density was 49.8 inhabitants per square mile (19.2/km²).
There were 9,176 housing units at an average density of 23.0 per square mile (8.9/km²).
The racial makeup of the county was 97.0% white, 0.9% black or African American, 0.3% Asian, 0.3% American Indian, 0.3% from other races, and 1.2% from two or more races.
Those of Hispanic or Latino origin made up 1.0% of the population.
In terms of ancestry, 22.6% were of English ancestry, 18.8% were of German ancestry and 12.4% were of Irish ancestry.

Of the 7,872 households, 32.3% had children under the age of 18 living with them, 53.4% were married couples living together, 10.4% had a female householder with no husband present, 31.2% were non-families, and 26.7% of all households were made up of individuals.
The average household size was 2.49 and the average family size was 3.00.
The median age was 40.8 years.

The median income for a household in the county was $47,697 and the median income for a family was $45,874.
Males had a median income of $35,679 versus $30,072 for females.
The per capita income for the county was $19,119.
About 13.5% of families and 20.2% of the population were below the poverty line, including 29.7% of those under age 18 and 14.7% of those age 65 or over.
As of the 2010 United States Census, there were 19,840 people, 7,872 households, and 5,416 families in the county. The population density was 49.8 inhabitants per square mile (19.2/km²). There were 9,176 housing units at an average density of 23.0 per square mile (8.9/km²). The racial makeup of the county was 97.0% white, 0.9% black or African American, 0.3% Asian, 0.3% American Indian, 0.3% from other races, and 1.2% from two or more races. Those of Hispanic or Latino origin made up 1.0% of the population. In terms of ancestry, 22.6% were of English ancestry, 18.8% were of German ancestry and 12.4% were of Irish ancestry.
Of the 7,872 households, 32.3% had children under the age of 18 living with them, 53.4% were married couples living together, 10.4% had a female householder with no husband present, 31.2% were non-families, and 26.7% of all households were made up of individuals. The average household size was 2.49 and the average family size was 3.00. The median age was 40.8 years.
The median income for a household in the county was $47,697 and the median income for a family was $45,874. Males had a median income of $35,679 versus $30,072 for females. The per capita income for the county was $19,119. About 13.5% of families and 20.2% of the population were below the poverty line, including 29.7% of those under age 18 and 14.7% of those age 65 or over.
Orange County, Indiana