According to theU.S. Census Bureau, the county has a total area of 3,223 square miles (8,350 km2), of which 3,221 square miles (8,340 km2) is land and 1.9 square miles (4.9 km2) (0.06%) is water.[6]
U.S. Decennial Census[8] 1790-1960[9] 1900-1990[10] 1990-2000[11] 2010-2020[2]
At the2000 census there were 5,986 people, 2,306 households, and 1,646 families living in the county. The population density was 2 people per square mile (0.77 people/km2). There were 2,855 housing units at an average density of 1 units per square mile (0.39 units/km2). Theracial makeup of the county was 95.01% White, 0.18% Black or African American, 0.77% Native American, 0.28% Asian, 2.02% from other races, and 1.74% from two or more races. 4.94% of the population were Hispanic or Latino of any race.[12]Of the 2,306 households 35.60% had children under the age of 18 living with them, 60.10% were married couples living together, 7.80% had a female householder with no husband present, and 28.60% were non-families. 24.80% of households were one person and 8.70% were one person aged 65 or older. The average household size was 2.50 and the average family size was 2.98.
The age distribution was 26.50% under the age of 18, 9.20% from 18 to 24, 27.50% from 25 to 44, 25.60% from 45 to 64, and 11.20% 65 or older. The median age was 38 years. For every 100 females there were 101.90 males. For every 100 females age 18 and over, there were 101.60 males.
The median household income was $37,711 and the median family income was $44,425. Males had a median income of $38,125 versus $19,940 for females. The per capita income for the county was $17,344. About 6.70% of families and 9.60% of the population were below thepoverty line, including 11.60% of those under age 18 and 10.40% of those age 65 or over.
Rio Blanco County is home to Meeker School District RE-1 and Rangely School District RE-4,[citation needed] as well as Rangely Christian Academy, a private K-8 school.[13]
Rio Blanco is an overwhelmingly Republican county in Presidential elections. It was along withClark County, Idaho andKane County, Utah one of only three counties west of theContinental Divide to vote forAlf Landon overFranklin Delano Roosevelt in 1936. In that election Rio Blanco was Landon's strongest county in the eleven western states, marginally shading normal Republican “banner county” Kane. Since that time only two Democrats –Harry S. Truman in 1948 andLyndon Johnson who narrowly carried the county in 1964 – have obtained over forty percent of the county's vote. In fact, since 1968 only one Democratic presidential candidate, Michael Dukakis in 1988, and him only very marginally, has topped thirty percent of Rio Blanco County's ballots. In 2024, the county saw a swing to the Democratic nomineeKamala Harris (against both the state and national trends) butDonald Trump was still able to attain over 80% of the vote.
United States presidential election results for Rio Blanco County, Colorado[15]
In other statewide elections, Rio Blanco County also leans Republican, although it was carried by DemocratRoy Romer in 1990[16] – when he carried all but four counties statewide – and by Constitution Party candidateTom Tancredo in 2010.[17] Rio Blanco County was also carried by Democratic Senatorial candidate“Nighthorse” Campbell in 1992,[18] although since then no Democratic candidate for this office has surpassed thirty percent since.
