As of the census of 2000, there were 812,280 people, 320,766 households, and 183,798 families residing in the county. The population density was 821 people per square mile (317/km²). There were 335,881 housing units at an average density of 340 per square mile (131/km²). The racial makeup of the county was 68.21% White, 9.26% Black or African American, 0.58% Native American, 4.47% Asian, 0.07% Pacific Islander, 14.56% other races, and 2.85% from two or more races. 28.20% of the population were Hispanic or Latino of any race. 12.0% were of German, 7.7% English, 6.6% Irish and 5.5% American ancestry according to Census 2000. English the sole language spoken at home by 71.42% of the population age 5 or over, while 22.35% speaks Spanish, and a Chinese language (including Mandarin, Taiwanese, and Cantonese) is spoken by 1.05% [1].
The 2005 American Community Survey conducted by the census indicated that 25.1% of Travis County's population spoke Spanish in the home.
In 2000 there were 320,766 households, of which 29.30% had children under the age of 18 living with them, 42.60% were married couples living together, 10.40% had a female householder with no husband present, and 42.70% were non-families. 30.10% of all households were composed of individuals and 4.40% had someone living alone who was 65 or older. The average household size was 2.47 and the average family size was 3.15.
The population's age distribution was 23.80% under the age of 18, 14.70% from 18 to 24, 36.50% from 25 to 44, 18.20% from 45 to 64, and 6.70% age 65 years of age or older. The median age was 30 years. For every 100 females there were 104.90 males. For every 100 females age 18 and over, there were 104.50 males.
The median income per household in the county was $46,761, and the median income per family was $58,555. Males had a median income of $37,242 versus $30,452 for females. The per capita income in the county was $25,883. About 7.70% of families and 12.50% of the population were below the poverty line, including 13.90% of those under age 18 and 7.60% of those age 65 or over.