| Rank | County | Percentage with College Degree | 
                            
                                
                                    | 1 | Clay County, South Dakota | 41.7% | 
                            
                                
                                    | 2 | Brookings County, South Dakota | 38.2% | 
                            
                                
                                    | 3 | Lincoln County, South Dakota | 36.4% | 
                            
                                
                                    | 4 | Hughes County, South Dakota | 34.9% | 
                            
                                
                                    | 5 | Lawrence County, South Dakota | 31.2% | 
                            
                                
                                    | 6 | Harding County, South Dakota | 31.2% | 
                            
                                
                                    | 7 | Custer County, South Dakota | 30.4% | 
                            
                                
                                    | 8 | Union County, South Dakota | 29.6% | 
                            
                                
                                    | 9 | Minnehaha County, South Dakota | 29.2% | 
                            
                                
                                    | 10 | Sully County, South Dakota | 28.5% | 
                            
                                
                                    | 11 | Stanley County, South Dakota | 28.2% | 
                            
                                
                                    | 12 | Pennington County, South Dakota | 27.7% | 
                            
                                
                                    | 13 | Lake County, South Dakota | 26.6% | 
                            
                                
                                    | 14 | Hutchinson County, South Dakota | 26.1% | 
                            
                                
                                    | 15 | Yankton County, South Dakota | 25.9% | 
                            
                                
                                    | 16 | Brown County, South Dakota | 25.0% | 
                            
                                
                                    | 17 | Codington County, South Dakota | 24.2% | 
                            
                                
                                    | 18 | Edmunds County, South Dakota | 23.5% | 
                            
                                
                                    | 19 | Walworth County, South Dakota | 23.5% | 
                            
                                
                                    | 20 | Davison County, South Dakota | 23.1% | 
                            
                                
                                    | 21 | Brule County, South Dakota | 21.8% | 
                            
                                
                                    | 22 | Moody County, South Dakota | 21.7% | 
                            
                                
                                    | 23 | Turner County, South Dakota | 21.5% | 
                            
                                
                                    | 24 | Meade County, South Dakota | 21.5% | 
                            
                                
                                    | 25 | Hanson County, South Dakota | 21.0% | 
                            
                                
                                    | 26 | Fall River County, South Dakota | 20.9% | 
                            
                                
                                    | 27 | Kingsbury County, South Dakota | 20.8% | 
                            
                                
                                    | 28 | Miner County, South Dakota | 20.0% | 
                            
                                
                                    | 29 | McCook County, South Dakota | 19.6% | 
                            
                                
                                    | 30 | Spink County, South Dakota | 19.5% | 
                            
                                
                                    | 31 | Beadle County, South Dakota | 19.4% | 
                            
                                
                                    | 32 | Lyman County, South Dakota | 19.2% | 
                            
                                
                                    | 33 | Potter County, South Dakota | 19.1% | 
                            
                                
                                    | 34 | Tripp County, South Dakota | 18.7% | 
                            
                                
                                    | 35 | Grant County, South Dakota | 18.4% | 
                            
                                
                                    | 36 | Perkins County, South Dakota | 18.3% | 
                            
                                
                                    | 37 | Hamlin County, South Dakota | 18.2% | 
                            
                                
                                    | 38 | Hand County, South Dakota | 17.9% | 
                            
                                
                                    | 39 | Hyde County, South Dakota | 17.5% | 
                            
                                
                                    | 40 | Bon Homme County, South Dakota | 17.5% | 
                            
                                
                                    | 41 | Clark County, South Dakota | 17.5% | 
                            
                                
                                    | 42 | Deuel County, South Dakota | 17.5% | 
                            
                                
                                    | 43 | McPherson County, South Dakota | 17.3% | 
                            
                                
                                    | 44 | Haakon County, South Dakota | 17.2% | 
                            
                                
                                    | 45 | Butte County, South Dakota | 16.9% | 
                            
                                
                                    | 46 | Day County, South Dakota | 16.9% | 
                            
                                
                                    | 47 | Sanborn County, South Dakota | 16.7% | 
                            
                                
                                    | 48 | Jackson County, South Dakota | 16.7% | 
                            
                                
                                    | 49 | Jones County, South Dakota | 16.5% | 
                            
                                
                                    | 50 | Marshall County, South Dakota | 16.2% | 
                            
                                
                                    | 51 | Roberts County, South Dakota | 16.1% | 
                            
                                
                                    | 52 | Campbell County, South Dakota | 16.0% | 
                            
                                
                                    | 53 | Faulk County, South Dakota | 15.7% | 
                            
                                
                                    | 54 | Bennett County, South Dakota | 15.6% | 
                            
                                
                                    | 55 | Mellette County, South Dakota | 15.4% | 
                            
                                
                                    | 56 | Charles Mix County, South Dakota | 15.4% | 
                            
                                
                                    | 57 | Gregory County, South Dakota | 15.1% | 
                            
                                
                                    | 58 | Todd County, South Dakota | 14.9% | 
                            
                                
                                    | 59 | Jerauld County, South Dakota | 14.6% | 
                            
                                
                                    | 60 | Dewey County, South Dakota | 14.2% | 
                            
                                
                                    | 61 | Aurora County, South Dakota | 13.9% | 
                            
                                
                                    | 62 | Ziebach County, South Dakota | 13.8% | 
                            
                                
                                    | 63 | Douglas County, South Dakota | 13.7% | 
                            
                                
                                    | 64 | Corson County, South Dakota | 13.2% | 
                            
                                
                                    | 65 | Shannon County, South Dakota | 13.0% | 
                            
                                
                                    | 66 | Buffalo County, South Dakota | 9.5% |