[3] The point where the Arikaree River flows out of Yuma County and into Cheyenne County, Kansas is the lowest point in the State of Colorado at 1,010 meters (3,310 feet) elevation.

[4] At the 2000 census there were 9,841 people, 3,800 households, and 2,644 families living in the county.

The racial makeup of the county was 94.17% White, 0.11% Black or African American, 0.28% Native American, 0.07% Asian, 0.02% Pacific Islander, 4.14% from other races, and 1.21% from two or more races.

Like all the High Plains, Yuma County is a Republican Party stronghold in presidential elections.

Only nine presidential elections from 1892 to the present day have seen the county fail to back the Republican candidate, the most recent being 1964 during Lyndon B. Johnson's statewide & national landslide.