It was named after Clear Creek, which runs down from the continental divide through the county.

[4] At the 2000 census there were 9,322 people, 4,019 households, and 2,608 families living in the county.

The racial makeup of the county was 96.37% White, 0.28% Black or African American, 0.73% Native American, 0.36% Asian, 0.03% Pacific Islander, 1.02% from other races, and 1.20% from two or more races.

About 3.00% of families and 5.40% of the population were below the poverty line, including 6.80% of those under age 18 and 5.60% of those age 65 or over Throughout its history, Clear Creek County tended to be somewhat divided between Republicans and Democrats, but has reliably voted Democratic in recent elections, with George W. Bush having been the most recent Republican to win the county, in 2000, while his father, George H. W. Bush, was the last Republican to win the narrow majority of the county's votes, in 1988.

The county is served by Clear Creek School District RE-1.