According to the U.S. Census Bureau, the county has a total area of, of which is land and is covered by water. Palo Duro Canyon, the second-largest canyon in the United States, is located in Randall County.
As of the census of 2000, 104,312 people, 41,240 households, and 28,785 families resided in the county. The population density was 114 people per square mile. The 43,261 housing units averaged 47 per square mile. The racial makeup of the county was 90.44% White, 1.50% Black or African American, 0.65% Native American, 1.03% Asian, 0.03% Pacific Islander, 4.71% from other races, and 1.64% from two or more races. About 10.3% of the population were Hispanic or Latino of any race. Of the 41,240 households, 33.90% had children under the age of 18 living with them, 57.50% were married couplesliving together, 9.20% had a female householder with no husband present, and 30.20% were not families; 25.40% of all households were made up of individuals, and 8.50% had someone living alone who was 65 years of age or older. The average household size was 2.49, and the average family size was 3.00. In the county, the population was distributed as 26.10% under the age of 18, 11.20% from 18 to 24, 28.40% from 25 to 44, 22.40% from 45 to 64, and 11.90% who were 65 years of age or older. The median age was 35 years. For every 100 females, there were 94.70 males. For every 100 females age 18 and over, there were 91.20 males. The median income for a household in the county was $42,712, and for a family was $52,420. Males had a median income of $36,333 versus $25,358 for females. The per capita income for the county was $21,840. About 5.70% of families and 8.10% of the population were below the poverty line, including 8.50% of those under age 18 and 6.60% of those age 65 or over.
Politics
Although once more Democratic-leaning, the county has become solidly Republican. The Republican candidate has carried the county in every presidential election since 1952, usually by overwhelming margins. In the last thirteen elections, no Republican candidate has received less than 61% of the county's vote, and since 2000, Randall has been the nation’s most Republican "metropolitan" county outside of predominantly Mormon counties in Utah. Randall County was one of the more than 200 counties in Texas to cast the majority of its votes for Republican John McCain. McCain received 41,895 votes, which was 81% of the total, while Democrat Barack Obama received 9,461 votes, or 18% of the total, far below his national percentage.
