Mesa Verde National Park, Canyon of the Ancients National Monument, Yucca House National Monument, and Hovenweep National Monument preserve hundreds of ancient AmerIndian structures, including the famous cliff-dwellings, found in the county. Montezuma County is also home to most of the Ute Mountain Indian Reservation, home of the Weeminuche Band of the Ute Nation, known as the Ute Mountain Ute Tribe, with its headquarters at Towaoc.
As of the census of 2000, there were 23,830 people, 9,201 households, and 6,514 families residing in the county. The population density was 12 people per square mile (5/km²). There were 10,497 housing units at an average density of 5 per square mile (2/km²). The racial makeup of the county was 81.72% White, 0.14% Black or African American, 11.23% Native American, 0.20% Asian, 0.06% Pacific Islander, 4.26% from other races, and 2.38% from two or more races. 9.50% of the population were Hispanic or Latino of any race.
There were 9,201 households out of which 33.30% had children under the age of 18 living with them, 56.40% were married couples living together, 10.60% had a female householder with no husband present, and 29.20% were non-families. 24.60% of all households were made up of individuals and 9.30% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.04.
In the county the population was spread out with 27.50% under the age of 18, 7.10% from 18 to 24, 26.30% from 25 to 44, 25.30% from 45 to 64, and 13.80% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 96.70 males. For every 100 females age 18 and over, there were 92.20 males.
The median income for a household in the county was $32,083, and the median income for a family was $38,071. Males had a median income of $30,666 versus $21,181 for females. The per capita income for the county was $17,003. About 13.10% of families and 16.40% of the population were below the poverty line, including 23.20% of those under age 18 and 14.40% of those age 65 or over.