 As of 2010 Polk County had a population of 20,662.Of this population 89.77% were non-Hispanic whites, 0.31% were blacks, 1.76% Native Americans, 0.45% Asians, 2.03% non-Hispanics reporting one or more race and 5.76% Hispanic or Latino.Over The past few election cycles Polk County has trended heavily towards the GOP.