Brown County

2020 census

As of the 2020 census, there were 38,301 people, 16,130 households, and 9,595 families residing in the county, of which 28.0% had children under the age of 18 living with them and 25.9% had a female householder with no spouse or partner present. About 33.9% of all households were made up of individuals and 13.7% had someone living alone who was 65 years of age or older.

The population density was 22.4 inhabitants per square mile (8.6/km2). There were 17,885 housing units at an average density of 10.4 per square mile (4.0/km2), of which 9.8% were vacant. Among occupied housing units, 64.5% were owner-occupied and 35.5% were renter-occupied. The homeowner vacancy rate was 1.9% and the rental vacancy rate was 11.0%.

Of the residents, 23.7% were under the age of 18 and 18.1% were 65 years of age or older; the median age was 38.2 years. For every 100 females there were 98.8 males, and for every 100 females age 18 and over there were 97.3 males.

The racial makeup of the county was 86.4% White, 1.5% Black or African American, 3.1% American Indian and Alaska Native, 2.4% Asian, 1.8% from some other race, and 4.6% from two or more races. Hispanic or Latino residents of any race comprised 4.3% of the population.

2010 census

As of the 2010 census, there were 36,531 people, 15,489 households, and 9,374 families in the county. The population density was 21.3 inhabitants per square mile (8.2/km2). There were 16,706 housing units at an average density of 9.8 per square mile (3.8/km2). The racial makeup of the county was 93.23% White, 0.53% African American, 3.02% Native American, 0.97% Asian, 0.11% Pacific Islander, 0.41% from some other races and 1.72% from two or more races. Hispanic or Latino people of any race were 1.36% of the population.

Of the 15,489 households, 28.4% had children under the age of 18 living with them, 48.5% were married couples living together, 8.1% had a female householder with no husband present, 39.5% were non-families, and 33.0% of all households were made up of individuals. The average household size was 2.27 and the average family size was 2.89. The median age was 38.6 years.

The median income for a household in the county was $45,615 and the median income for a family was $58,683. Males had a median income of $37,997 versus $28,419 for females. The per capita income for the county was $23,878. About 5.6% of families and 10.2% of the population were below the poverty line, including 9.6% of those under age 18 and 15.4% of those age 65 or over.