Washington County is a county located in the U.S. state of Arkansas. As of 2000, the population was 157,715. The county seat is Fayetteville. Washington County is Arkansas's seventeenth county, formed on October 17, 1828 and named for George Washington, the first President of the United States.
Washington County is part of the Fayetteville-Springdale-Rogers, AR-MO Metropolitan Statistical Area.
As of the census of 2000, there were 157,715 people, 60,151 households, and 39,459 families residing in the county. The population density was 166 people per square mile (64/km²). There were 64,330 housing units at an average density of 68 per square mile (26/km²). The racial makeup of the county was 88.00% White, 2.24% Black or African American, 1.25% Native American, 1.54% Asian, 0.53% Pacific Islander, 4.26% from other races, and 2.17% from two or more races. 8.20% of the population were Hispanic or Latino of any race.
There were 60,151 households out of which 32.50% had children under the age of 18 living with them, 52.30% were married couples living together, 9.40% had a female householder with no husband present, and 34.40% were non-families. 25.80% of all households were made up of individuals and 7.10% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.07.
In the county the population was spread out with 25.00% under the age of 18, 15.30% from 18 to 24, 30.20% from 25 to 44, 19.50% from 45 to 64, and 9.90% who were 65 years of age or older. The median age was 31 years. For every 100 females there were 100.40 males. For every 100 females age 18 and over, there were 98.70 males.
The median income for a household in the county was $34,691, and the median income for a family was $42,795. Males had a median income of $29,428 versus $21,769 for females. The per capita income for the county was $17,347. About 9.40% of families and 14.60% of the population were below the poverty line, including 16.50% of those under age 18 and 10.20% of those age 65 or over.