| Rank | School District | Percentage with High School Diploma | 
                            
                                
                                    | 1 | Weston School District, Connecticut | 98.8% | 
                            
                                
                                    | 2 | Ridgefield School District, Connecticut | 97.8% | 
                            
                                
                                    | 3 | Westport School District, Connecticut | 97.6% | 
                            
                                
                                    | 4 | Darien School District, Connecticut | 97.5% | 
                            
                                
                                    | 5 | Glastonbury School District, Connecticut | 97.4% | 
                            
                                
                                    | 6 | Simsbury School District, Connecticut | 97.0% | 
                            
                                
                                    | 7 | Wilton School District, Connecticut | 96.5% | 
                            
                                
                                    | 8 | Avon School District, Connecticut | 96.5% | 
                            
                                
                                    | 9 | New Canaan School District, Connecticut | 96.2% | 
                            
                                
                                    | 10 | Guilford School District, Connecticut | 96.2% | 
                            
                                
                                    | 11 | Granby School District, Connecticut | 96.1% | 
                            
                                
                                    | 12 | Madison School District, Connecticut | 95.9% | 
                            
                                
                                    | 13 | Greenwich School District, Connecticut | 95.8% | 
                            
                                
                                    | 14 | Brookfield School District, Connecticut | 95.7% | 
                            
                                
                                    | 15 | East Hampton School District, Connecticut | 95.5% | 
                            
                                
                                    | 16 | New Fairfield School District, Connecticut | 95.5% | 
                            
                                
                                    | 17 | Colchester School District, Connecticut | 95.4% | 
                            
                                
                                    | 18 | Farmington School District, Connecticut | 95.2% | 
                            
                                
                                    | 19 | Canton School District, Connecticut | 95.2% | 
                            
                                
                                    | 20 | Fairfield School District, Connecticut | 95.0% | 
                            
                                
                                    | 21 | Old Saybrook School District, Connecticut | 95.0% | 
                            
                                
                                    | 22 | Ledyard School District, Connecticut | 95.0% | 
                            
                                
                                    | 23 | East Haddam School District, Connecticut | 94.9% | 
                            
                                
                                    | 24 | Coventry School District, Connecticut | 94.6% | 
                            
                                
                                    | 25 | Ellington School District, Connecticut | 94.5% | 
                            
                                
                                    | 26 | Tolland School District, Connecticut | 94.5% | 
                            
                                
                                    | 27 | Portland School District, Connecticut | 94.3% | 
                            
                                
                                    | 28 | Oxford School District, Connecticut | 94.3% | 
                            
                                
                                    | 29 | North Stonington School District, Connecticut | 94.1% | 
                            
                                
                                    | 30 | West Hartford School District, Connecticut | 94.1% | 
                            
                                
                                    | 31 | Stonington School District, Connecticut | 94.1% | 
                            
                                
                                    | 32 | Monroe School District, Connecticut | 94.0% | 
                            
                                
                                    | 33 | Newtown School District, Connecticut | 93.9% | 
                            
                                
                                    | 34 | Cromwell School District, Connecticut | 93.9% | 
                            
                                
                                    | 35 | Bethel School District, Connecticut | 93.7% | 
                            
                                
                                    | 36 | Bolton School District, Connecticut | 93.6% | 
                            
                                
                                    | 37 | Cheshire School District, Connecticut | 93.4% | 
                            
                                
                                    | 38 | Regional School District 15, Connecticut | 93.3% | 
                            
                                
                                    | 39 | Milford School District, Connecticut | 93.2% | 
                            
                                
                                    | 40 | Litchfield School District, Connecticut | 93.1% | 
                            
                                
                                    | 41 | Hamden School District, Connecticut | 93.1% | 
                            
                                
                                    | 42 | Clinton School District, Connecticut | 93.0% | 
                            
                                
                                    | 43 | North Branford School District, Connecticut | 92.9% | 
                            
                                
                                    | 44 | Windsor School District, Connecticut | 92.9% | 
                            
                                
                                    | 45 | Remainder of Connecticut, Connecticut | 92.9% | 
                            
                                
                                    | 46 | Seymour School District, Connecticut | 92.8% | 
                            
                                
                                    | 47 | Wolcott School District, Connecticut | 92.6% | 
                            
                                
                                    | 48 | South Windsor School District, Connecticut | 92.6% | 
                            
                                
                                    | 49 | Trumbull School District, Connecticut | 92.6% | 
                            
                                
                                    | 50 | North Haven School District, Connecticut | 92.6% | 
                            
                                
                                    | 51 | Southington School District, Connecticut | 92.5% | 
                            
                                
                                    | 52 | East Granby School District, Connecticut | 92.5% | 
                            
                                
                                    | 53 | Berlin School District, Connecticut | 92.4% | 
                            
                                
                                    | 54 | Westbrook School District, Connecticut | 92.4% | 
                            
                                
                                    | 55 | Waterford School District, Connecticut | 92.3% | 
                            
                                
                                    | 56 | Watertown School District, Connecticut | 92.2% | 
                            
                                
                                    | 57 | New Milford School District, Connecticut | 92.1% | 
                            
                                
                                    | 58 | Lebanon School District, Connecticut | 92.1% | 
                            
                                
                                    | 59 | Shelton School District, Connecticut | 92.1% | 
                            
                                
                                    | 60 | Vernon School District, Connecticut | 92.1% | 
                            
                                
                                    | 61 | Rocky Hill School District, Connecticut | 91.6% | 
                            
                                
                                    | 62 | Wallingford School District, Connecticut | 91.6% | 
                            
                                
                                    | 63 | Manchester School District, Connecticut | 91.5% | 
                            
                                
                                    | 64 | Branford School District, Connecticut | 91.5% | 
                            
                                
                                    | 65 | East Lyme School District, Connecticut | 91.3% | 
                            
                                
                                    | 66 | Regional High School District 19, Connecticut | 91.2% | 
                            
                                
                                    | 67 | Suffield School District, Connecticut | 91.2% | 
                            
                                
                                    | 68 | Stafford School District, Connecticut | 91.1% | 
                            
                                
                                    | 69 | Bloomfield School District, Connecticut | 91.1% | 
                            
                                
                                    | 70 | Thomaston School District, Connecticut | 90.9% | 
                            
                                
                                    | 71 | East Windsor School District, Connecticut | 90.8% | 
                            
                                
                                    | 72 | Wethersfield School District, Connecticut | 90.8% | 
                            
                                
                                    | 73 | Groton School District, Connecticut | 90.8% | 
                            
                                
                                    | 74 | Plymouth School District, Connecticut | 90.6% | 
                            
                                
                                    | 75 | Middletown School District, Connecticut | 90.6% | 
                            
                                
                                    | 76 | Windsor Locks School District, Connecticut | 90.3% | 
                            
                                
                                    | 77 | Griswold School District, Connecticut | 90.3% | 
                            
                                
                                    | 78 | Stratford School District, Connecticut | 90.2% | 
                            
                                
                                    | 79 | Newington School District, Connecticut | 90.2% | 
                            
                                
                                    | 80 | Norwalk School District, Connecticut | 90.0% | 
                            
                                
                                    | 81 | Mansfield School District, Connecticut | 89.1% | 
                            
                                
                                    | 82 | Plainville School District, Connecticut | 89.0% | 
                            
                                
                                    | 83 | Naugatuck School District, Connecticut | 88.9% | 
                            
                                
                                    | 84 | East Haven School District, Connecticut | 88.7% | 
                            
                                
                                    | 85 | Enfield School District, Connecticut | 88.4% | 
                            
                                
                                    | 86 | Somers School District, Connecticut | 88.4% | 
                            
                                
                                    | 87 | Putnam School District, Connecticut | 88.0% | 
                            
                                
                                    | 88 | Winchester School District, Connecticut | 88.0% | 
                            
                                
                                    | 89 | Bristol School District, Connecticut | 87.3% | 
                            
                                
                                    | 90 | West Haven School District, Connecticut | 86.7% | 
                            
                                
                                    | 91 | Thompson School District, Connecticut | 86.5% | 
                            
                                
                                    | 92 | Derby School District, Connecticut | 86.0% | 
                            
                                
                                    | 93 | Norwich School District, Connecticut | 85.6% | 
                            
                                
                                    | 94 | Montville School District, Connecticut | 85.4% | 
                            
                                
                                    | 95 | Ansonia School District, Connecticut | 85.3% | 
                            
                                
                                    | 96 | Torrington School District, Connecticut | 85.2% | 
                            
                                
                                    | 97 | Stamford School District, Connecticut | 84.1% | 
                            
                                
                                    | 98 | Killingly School District, Connecticut | 83.7% | 
                            
                                
                                    | 99 | Plainfield School District, Connecticut | 82.5% | 
                            
                                
                                    | 100 | East Hartford School District, Connecticut | 82.1% | 
                            
                                
                                    | 101 | Danbury School District, Connecticut | 81.7% | 
                            
                                
                                    | 102 | Meriden School District, Connecticut | 80.8% | 
                            
                                
                                    | 103 | New London School District, Connecticut | 80.8% | 
                            
                                
                                    | 104 | New Haven School District, Connecticut | 80.5% | 
                            
                                
                                    | 105 | Waterbury School District, Connecticut | 78.7% | 
                            
                                
                                    | 106 | Windham School District, Connecticut | 78.0% | 
                            
                                
                                    | 107 | New Britain School District, Connecticut | 76.8% | 
                            
                                
                                    | 108 | Bridgeport School District, Connecticut | 72.5% | 
                            
                                
                                    | 109 | Hartford School District, Connecticut | 68.5% |