2020 census As of the
2020 census, the county had a population of 19,495. Of the residents, 26.0% were under the age of 18 and 17.2% were 65 years of age or older; the median age was 39.4 years. For every 100 females there were 97.2 males, and for every 100 females age 18 and over there were 95.4 males. The racial makeup of the county was 39.2%
White, 0.2%
Black or African American, 44.0%
American Indian and Alaska Native, 0.8%
Asian, 2.3% from some other race, and 13.4% from
two or more races.
Hispanic or Latino residents of any race comprised 6.4% of the population.
2010 census As of the
census of 2010, Adair County had a small population relative to its surrounding counties, with only 21,038 people, a large percentage of them, 43.3 percent,
Native American. The remainder of the population was 43 percent
white, 10.5 percent of more than one race, and 5.3 percent
Hispanic or
Latino. Less than 1 percent of the population was either
Black or
African American,
Asian, or
Pacific Islander, and 2.3 percent were identified as
other. This makes it the only
majority-minority county in Oklahoma. Adair county had a higher percentage of Native Americans (American Indians) in its population than any other Oklahoma county. The median age of the population was 36.2 years and two-thirds of the county's population were either under the age of 18 (28 percent) or between the ages of 25 and 44 (24.8 percent). Of the remaining population, 25.9 percent were ages 45 to 64, 12.9 percent were 65 years of age or older, and 13.2 percent were ages 18 to 24. For every 100 females there were 100.1 males. For every 100 females age 18 and over, there were 98.3 males. There were a total of 8,156 households and 5,982 families in the county in 2010. There were 9,142 housing units. Of the 8,156 households, 31.4 percent included children under the age of 18 and slightly more than half (52.7 percent) included
married couples living together. 26.7 percent were non-family, 14.2 percent had a female householder with no husband present, and 26.8 percent contained a single individual of 65 years of age or older. The average household size was 2.77 and the average family size was 3.25. The median income for a household in the county was $27,258, and the median income for a family was $32,930. Males had a median income of $28,370 versus $23,384 for females. The
per capita income for the county was $13,560. About 25.3 percent of families and 27.8 percent of the population were below the
poverty line, including 36.8 percent of those under age 18 and 18.7 percent of those age 65 or over. ==Politics==