Location: SD-20 and SD-79, Harding Cty Reassurance shield after the 79 split. Location: SD-20 and Prairie City Rd, Prairie City, Perkins Cty Several miles later, after we enter Perkins County, we’ll approach Prairie City. Location: SD-20 and Prairie City Rd, Perkins Cty Reassurance shield after we pass Prairie City. Location: SD-20 and SD-75, Perkins Cty … Continue reading South Dakota Highway 20, SD-79 to SD-75