 About 10.1% of families and 13.8% of the population were below the poverty line, including 19.2% of those under age 18 and 13.2% of those age 65 or over.Custer County is overwhelmingly Republican.The last Democrat to carry the county was John F. Kennedy in 1960, since 1968 no Democrat has passed 37 percent of the county’s vote, and the last to pass 28 percent was Michael Dukakis in 1988.