Barry County is a county located in the southwest portion of the U.S. state of Missouri. As of the 2010 Census, the population was 35,597. Its county seat is Cassville. The county was organized in 1835 and named after William Taylor Barry, a U.S. Postmaster General from Kentucky.
According to the U.S. Census Bureau, the county has a total area of 791 square miles (2,050 km), of which 778 square miles (2,020 km) is land and 13 square miles (34 km) (1.6%) is water. Roaring River State Park is located in the southern part of the county, amid the Mark Twain National Forest.
As of the census of 2000, there were 34,010 people, 13,398 households, and 9,579 families residing in the county. The population density was 44 people per square mile (17/km²). There were 15,964 housing units at an average density of 20 per square mile (8/km²). The racial makeup of the county was 94.09% White, 0.11% Black or African American, 0.86% Native American, 0.27% Asian, 0.03% Pacific Islander, 3.25% from other races, and 1.38% from two or more races. Approximately 5.04% of the population were Hispanic or Latino of any race. 26.5% were of American, 15.5% German, 11.7% English and 10.4% Irish ancestry.
There were 13,398 households out of which 31.20% had children under the age of 18 living with them, 59.30% were married couples living together, 8.40% had a female householder with no husband present, and 28.50% were non-families. 24.70% of all households were made up of individuals and 11.60% had someone living alone who was 65 years of age or older. The average household size was 2.51 and the average family size was 2.98.
In the county, the population was spread out with 26.10% under the age of 18, 7.80% from 18 to 24, 26.10% from 25 to 44, 23.90% from 45 to 64, and 16.10% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 98.30 males. For every 100 females age 18 and over, there were 95.60 males.
The median income for a household in the county was $28,906, and the median income for a family was $34,043. Males had a median income of $25,381 versus $18,631 for females. The per capita income for the county was $14,980. About 11.80% of families and 16.60% of the population were below the poverty line, including 23.50% of those under age 18 and 11.90% of those age 65 or over.