As of the census of 2000, there were 167,517 people, 70,171 households, and 46,733 families residing in the county. The population density was 21 people per square mile (8/km²). There were 81,730 housing units at an average density of 10 per square mile (4/km²). The racial makeup of the county was 91.89% White, 0.39% Black or African American, 1.60% Native American, 0.51% Asian, 0.08% Pacific Islander, 3.58% from other races, and 1.95% from two or more races. 9.78% of the population were Hispanic or Latino of any race.
There were 70,171 households out of which 23.80% had children under the age of 18 living with them, 55.00% were married couples living together, 8.10% had a female householder with no husband present, and 33.40% were non-families. 26.70% of all households were made up of individuals and 12.40% had someone living alone who was 65 years of age or older. The average household size was 2.33 and the average family size was 2.79.
In the county the population was spread out with 21.10% under the age of 18, 7.10% from 18 to 24, 22.40% from 25 to 44, 27.40% from 45 to 64, and 22.00% who were 65 years of age or older. The median age was 44 years. For every 100 females there were 96.20 males. For every 100 females age 18 and over, there were 93.50 males.
The median income for a household in the county was $34,901, and the median income for a family was $40,910. Males had a median income of $30,738 versus $22,114 for females. The per capita income for the county was $19,727. About 7.90% of families and 11.90% of the population were below the poverty line, including 15.90% of those under age 18 and 6.70% of those age 65 or over.
By 2006 Census Bureau Estimates placed the population of Yavapai County at 208,014. This represented a 24.2% growth in the population since 2000.
Yavapai County is defined as the Prescott Metropolitan Statistical Area by the United States Census Bureau