As of the census of 2000, there were 69,423 people, 19,971 households, and 15,257 families residing in the county. The population density was 6 people per square mile (2/km²). There were 31,621 housing units at an average density of 3 per square mile (1/km²). The racial makeup of the county was 76.88% Native American, 19.50% White, 0.25% Black or African American, 0.13% Asian, 0.06% Pacific Islander, 1.75% from other races, and 1.43% from two or more races. 4.49% of the population were Hispanic or Latino of any race. 58.39% reported speaking Navajo at home, while 38.39% speak English and 2.71% Spanish [1].
There were 19,971 households out of which 43.80% had children under the age of 18 living with them, 49.30% were married couples living together, 21.40% had a female householder with no husband present, and 23.60% were non-families. 21.20% of all households were made up of individuals and 6.90% had someone living alone who was 65 years of age or older. The average household size was 3.41 and the average family size was 4.04.
In the county the population was spread out with 38.50% under the age of 18, 9.40% from 18 to 24, 25.10% from 25 to 44, 18.70% from 45 to 64, and 8.30% who were 65 years of age or older. The median age was 27 years. For every 100 females there were 98.20 males. For every 100 females age 18 and over, there were 94.50 males.
The median income for a household in the county was $23,344, and the median income for a family was $26,315. Males had a median income of $30,182 versus $22,312 for females. The per capita income for the county was $8,986. About 33.50% of families and 37.80% of the population were below the poverty line, including 42.80% of those under age 18 and 36.50% of those age 65 or over. The county's per-capita income makes it one of the poorest counties in the United States.
Apache County is one of only 38 county-level census divisions of the United States where the most spoken language is not English and one of only 3 where it is neither English nor Spanish. 58.32% of the population speak Navajo at home, followed by English at 38.34% and Spanish at 2.72%.