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Knox County is a county in the U.S. state of Tennessee. As of the 2010 census, the population was 432,226, making it the third-most populous county in Tennessee. Its county seat is Knoxville, the third-most populous city in Tennessee.
Knox County is included in the Knoxville, TN Metropolitan Statistical Area.
The county is at the geographical center of the Great Valley of East Tennessee. Near the heart of the county is the origin of the Tennessee River at the union of the Holston and French Broad rivers.
As of the census of 2000, there were 382,032 people, 157,872 households, and 100,722 families residing in the county. The population density was 751 people per square mile (290/km²). There were 171,439 housing units at an average density of 337 per square mile (130/km²). The racial makeup of the county was 88.10% White, 8.63% Black or African American, 0.26% Native American, 1.29% Asian, 0.03% Pacific Islander, 0.50% from other races, and 1.18% from two or more races. 1.26% of the population were Hispanic or Latino of any race.
There were 157,872 households out of which 28.50% had children under the age of 18 living with them, 49.80% were married couples living together, 10.90% had a female householder with no husband present, and 36.20% were non-families. 29.60% of all households were made up of individuals and 9.10% had someone living alone who was 65 years of age or older. The average household size was 2.34 and the average family size was 2.92.
In the county, the population was spread out with 22.30% under the age of 18, 11.60% from 18 to 24, 30.40% from 25 to 44, 23.10% from 45 to 64, and 12.70% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 93.50 males. For every 100 females age 18 and over, there were 90.10 males.
The median income for a household in the county was $37,454, and the median income for a family was $49,182. Males had a median income of $35,755 versus $25,140 for females. The per capita income for the county was $21,875. About 8.40% of families and 12.60% of the population were below the poverty line, including 14.50% of those under age 18 and 9.70% of those age 65 or over.