According to theU.S. Census Bureau, the county has a total area of 5,455 square miles (14,130 km2), of which 5.5 sq mi (14 km2) (0.1%) are covered by water.[4]
McKinley County, New Mexico – Racial composition Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.
As of the2010 census, 71,492 people, 21,968 households, and 16,219 families resided in the county.[15] The population density was 13.1 inhabitants per square mile (5.1/km2). The 25,813 housing units had an average density of 4.7/sq mi (1.8/km2).[16] The racial makeup of the county was 75.5% Native American, 15.2% White, 0.8% Asian, 0.5% Black or African American, 4.9% from other races, and 3.1% from two or more races. Those of Hispanic or Latino origin made up 13.3% of the population.[15]
Of the 21,968 households, 46.2% had children under 18 living with them, 40.8% were married couples living together, 24.5% had a female householder with no husband present, 26.2% were not families, and 22.4% of all households were made up of individuals. The average household size was 3.22, and the average family size was 3.82. The median age was 30.7 years.[15]
The median income for a household in the county was $31,335 and for a family was $37,345. Males had a median income of $31,527 versus $26,236 for females. The per capita income for the county was $12,932. About 26.6% of families and 33.4% of the population were below thepoverty line, including 43.0% of those under 18 and 31.3% of those 65 or over.[17]
As of the2000 census,[18] 74,798 people, 21,476 households, and 16,686 families were living in the county. Thepopulation density was 14 people per square mile (5.4 people/km2). The 26,718 housing units had an average density of 5 units per square mile (1.9 units/km2). Theracial makeup of the county was 74.72% Native American, 16.39% White, 0.46% Asian, 0.40% African American, 0.04% Pacific Islander, 5.47% from other races, and 2.52% from two or more races. About 12.40% of the population were Hispanics or Latinos of any race.
Of the 21,476 households, 46.0% had children under 18 living with them, 47.7% were married couples living together, 22.7% had a female householder with no husband present, and 22.3% were not families. About 19.5% of all households were made up of individuals, and 5.3% had someone living alone who was 65 or older. The average household size was 3.44, and the average family size was 3.99.
In the county, the age distribution was 38.0% under 18, 9.7% from 18 to 24, 27.8% from 25 to 44, 17.6% from 45 to 64, and 6.9% who were 65 or older. The median age was 27 years. For every 100 females, there were 93.50 males. For every 100.0 females 18 and over, there were 89.3 males.
The median income for a household in the county was $25,005, and for a family was $26,806. Males had a median income of $26,963 versus $21,014 for females. Theper capita income for the county was $9,872. About 31.9% of families and 36.1% of the population were below thepoverty line, including 42.3% of those under 18 and 31.5% of those 65 or over. The county'sper capita income makes it one of thepoorest counties in the United States.
McKinley 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 three where it is neither English nor Spanish; 45.75% of the population speakNavajo at home, followed by English at 38.87%,Zuñi at 9.03%, and Spanish at 5.72%.
During its early history from 1912 to 1928, McKinley County voted for the Republican candidate in every presidential election. From 1932 onward, the county, with its large Native American majority, has strongly backed Democratic candidates in all but three presidential elections that were national landslides for the Republican Party.
Democratic strength in the county lies in most of Gallup and the Navajo and Zuni Reservations, which cover a large majority of the county's land area. The community of Ramah has previously been one of the only Republican-leaning parts of the county. In 2024 the county saw the strongest shift toward the Republican party of any county in New Mexico, along withGuadalupe,Mora, andRio Arriba Counties. Parts of southern Gallup and the Thoreau area flipped to a Republican majority, and many parts of the Navajo and Zuni Reservations experienced shifts as well along with most other rural areas.[25]
United States presidential election results for McKinley County, New Mexico[26]