 According to the census of 2000, the largest ancestry groups in DeKalb County were English 78.31%, Scotch-Irish 8.29%, Scottish 3.33%, Irish 3.31%, Welsh 1.22%, and African 1.68%



DeKalb County is strongly Republican.Eighty-three percent of its voters supported Donald Trump in 2016, and no Democrat has carried it since Southerner Jimmy Carter did so in 1976.Populist appeal in the county during the period of “Redemption” meant that even during the “Solid South” era DeKalb County sometimes supported victorious Republican presidential candidates, as it did during the three Republican landslides of the 1920s.