| Rank | County | Percentage with High School Diploma | 
                            
                                
                                    | 1 | Williamson County, Tennessee | 94.5% | 
                            
                                
                                    | 2 | Montgomery County, Tennessee | 90.2% | 
                            
                                
                                    | 3 | Knox County, Tennessee | 89.0% | 
                            
                                
                                    | 4 | Rutherford County, Tennessee | 88.8% | 
                            
                                
                                    | 5 | Wilson County, Tennessee | 87.8% | 
                            
                                
                                    | 6 | Sumner County, Tennessee | 86.0% | 
                            
                                
                                    | 7 | Blount County, Tennessee | 85.9% | 
                            
                                
                                    | 8 | Hamilton County, Tennessee | 85.8% | 
                            
                                
                                    | 9 | Shelby County, Tennessee | 85.5% | 
                            
                                
                                    | 10 | Davidson County, Tennessee | 85.3% | 
                            
                                
                                    | 11 | Washington County, Tennessee | 85.1% | 
                            
                                
                                    | 12 | Madison County, Tennessee | 84.9% | 
                            
                                
                                    | 13 | Loudon County, Tennessee | 84.8% | 
                            
                                
                                    | 14 | Fayette County, Tennessee | 84.1% | 
                            
                                
                                    | 15 | Tipton County, Tennessee | 84.1% | 
                            
                                
                                    | 16 | Anderson County, Tennessee | 83.9% | 
                            
                                
                                    | 17 | Maury County, Tennessee | 83.9% | 
                            
                                
                                    | 18 | Stewart County, Tennessee | 83.5% | 
                            
                                
                                    | 19 | Humphreys County, Tennessee | 83.1% | 
                            
                                
                                    | 20 | Sullivan County, Tennessee | 82.7% | 
                            
                                
                                    | 21 | Robertson County, Tennessee | 82.7% | 
                            
                                
                                    | 22 | Cheatham County, Tennessee | 82.5% | 
                            
                                
                                    | 23 | Weakley County, Tennessee | 82.4% | 
                            
                                
                                    | 24 | Roane County, Tennessee | 82.1% | 
                            
                                
                                    | 25 | Coffee County, Tennessee | 81.8% | 
                            
                                
                                    | 26 | Dickson County, Tennessee | 81.6% | 
                            
                                
                                    | 27 | Henry County, Tennessee | 81.4% | 
                            
                                
                                    | 28 | Cumberland County, Tennessee | 81.3% | 
                            
                                
                                    | 29 | Houston County, Tennessee | 81.3% | 
                            
                                
                                    | 30 | Sevier County, Tennessee | 81.1% | 
                            
                                
                                    | 31 | Henderson County, Tennessee | 80.9% | 
                            
                                
                                    | 32 | Gibson County, Tennessee | 80.9% | 
                            
                                
                                    | 33 | Putnam County, Tennessee | 80.7% | 
                            
                                
                                    | 34 | Dyer County, Tennessee | 80.6% | 
                            
                                
                                    | 35 | Moore County, Tennessee | 80.5% | 
                            
                                
                                    | 36 | Obion County, Tennessee | 80.4% | 
                            
                                
                                    | 37 | Bradley County, Tennessee | 80.2% | 
                            
                                
                                    | 38 | Franklin County, Tennessee | 79.4% | 
                            
                                
                                    | 39 | Greene County, Tennessee | 79.2% | 
                            
                                
                                    | 40 | Giles County, Tennessee | 79.2% | 
                            
                                
                                    | 41 | Morgan County, Tennessee | 79.1% | 
                            
                                
                                    | 42 | Hawkins County, Tennessee | 79.0% | 
                            
                                
                                    | 43 | Trousdale County, Tennessee | 79.0% | 
                            
                                
                                    | 44 | Lincoln County, Tennessee | 79.0% | 
                            
                                
                                    | 45 | Jefferson County, Tennessee | 78.8% | 
                            
                                
                                    | 46 | Carter County, Tennessee | 78.6% | 
                            
                                
                                    | 47 | Hamblen County, Tennessee | 78.5% | 
                            
                                
                                    | 48 | McMinn County, Tennessee | 78.4% | 
                            
                                
                                    | 49 | Marshall County, Tennessee | 78.3% | 
                            
                                
                                    | 50 | Chester County, Tennessee | 78.0% | 
                            
                                
                                    | 51 | Smith County, Tennessee | 77.8% | 
                            
                                
                                    | 52 | Lawrence County, Tennessee | 77.6% | 
                            
                                
                                    | 53 | Pickett County, Tennessee | 77.6% | 
                            
                                
                                    | 54 | Carroll County, Tennessee | 77.3% | 
                            
                                
                                    | 55 | Benton County, Tennessee | 77.0% | 
                            
                                
                                    | 56 | Crockett County, Tennessee | 76.6% | 
                            
                                
                                    | 57 | Hickman County, Tennessee | 76.5% | 
                            
                                
                                    | 58 | Perry County, Tennessee | 76.4% | 
                            
                                
                                    | 59 | Lewis County, Tennessee | 76.1% | 
                            
                                
                                    | 60 | Cannon County, Tennessee | 76.1% | 
                            
                                
                                    | 61 | McNairy County, Tennessee | 76.1% | 
                            
                                
                                    | 62 | Rhea County, Tennessee | 75.9% | 
                            
                                
                                    | 63 | Warren County, Tennessee | 75.8% | 
                            
                                
                                    | 64 | Bedford County, Tennessee | 75.6% | 
                            
                                
                                    | 65 | Haywood County, Tennessee | 75.5% | 
                            
                                
                                    | 66 | Macon County, Tennessee | 75.3% | 
                            
                                
                                    | 67 | Unicoi County, Tennessee | 75.3% | 
                            
                                
                                    | 68 | Van Buren County, Tennessee | 75.1% | 
                            
                                
                                    | 69 | Meigs County, Tennessee | 75.0% | 
                            
                                
                                    | 70 | White County, Tennessee | 74.9% | 
                            
                                
                                    | 71 | Sequatchie County, Tennessee | 74.9% | 
                            
                                
                                    | 72 | Polk County, Tennessee | 74.8% | 
                            
                                
                                    | 73 | Marion County, Tennessee | 74.5% | 
                            
                                
                                    | 74 | Lauderdale County, Tennessee | 74.5% | 
                            
                                
                                    | 75 | Monroe County, Tennessee | 74.4% | 
                            
                                
                                    | 76 | Hardin County, Tennessee | 74.3% | 
                            
                                
                                    | 77 | Scott County, Tennessee | 74.0% | 
                            
                                
                                    | 78 | Wayne County, Tennessee | 73.9% | 
                            
                                
                                    | 79 | Decatur County, Tennessee | 73.9% | 
                            
                                
                                    | 80 | Overton County, Tennessee | 73.7% | 
                            
                                
                                    | 81 | Cocke County, Tennessee | 72.8% | 
                            
                                
                                    | 82 | DeKalb County, Tennessee | 72.6% | 
                            
                                
                                    | 83 | Bledsoe County, Tennessee | 72.6% | 
                            
                                
                                    | 84 | Hardeman County, Tennessee | 71.2% | 
                            
                                
                                    | 85 | Claiborne County, Tennessee | 70.7% | 
                            
                                
                                    | 86 | Fentress County, Tennessee | 70.4% | 
                            
                                
                                    | 87 | Johnson County, Tennessee | 70.1% | 
                            
                                
                                    | 88 | Union County, Tennessee | 70.0% | 
                            
                                
                                    | 89 | Campbell County, Tennessee | 69.8% | 
                            
                                
                                    | 90 | Clay County, Tennessee | 69.7% | 
                            
                                
                                    | 91 | Jackson County, Tennessee | 69.5% | 
                            
                                
                                    | 92 | Hancock County, Tennessee | 69.5% | 
                            
                                
                                    | 93 | Lake County, Tennessee | 68.6% | 
                            
                                
                                    | 94 | Grainger County, Tennessee | 68.6% | 
                            
                                
                                    | 95 | Grundy County, Tennessee | 65.0% |