[2] The county was organized February 6, 1837, and named for John Miller,[3] former U.S. Representative and Governor of Missouri.

The only other time it supported a Democrat in the 20th century was in 1912, when Woodrow Wilson carried the county against a mortally divided GOP.

Lyndon Johnson is the last Democrat to garner even 40 percent of the county's vote.

Underlining how Republican the county has been over the years, it rejected native son Harry Truman in 1944 as Roosevelt's running mate, and when he headed the ticket himself in 1948.

The Republican Party completely controls politics at the local level in Miller County.

Former Governor Mike Huckabee (R-Arkansas) received more votes, a total of 1,406, than any candidate from either party in Miller County during the 2008 presidential primary.