| Rank | High School Graduate Education Percentage ▼ | School District / Population |
| 1. | 45.7% | Sterling School District / 3,671 |
| 2. | 43.7% | Chaplin School District / 2,515 |
| 3. | 42.9% | Lisbon School District / 4,229 |
| 4. | 42.7% | Griswold School District / 11,389 |
| 5. | 41.6% | East Haven School District / 28,539 |
| 6. | 40.9% | Plainville School District / 17,210 |
| 7. | 40.6% | Stafford School District / 11,802 |
| 8. | 40.5% | East Windsor School District / 10,656 |
| 8. | 40.5% | Scotland School District / 1,888 |
| 10. | 40.4% | Plainfield School District / 15,389 |
| 11. | 40.1% | Derby School District / 12,396 |
| 12. | 40.0% | East Hartford School District / 48,627 |
| 13. | 39.9% | Killingly School District / 17,608 |
| 13. | 39.9% | West Haven School District / 52,727 |
| 15. | 39.8% | Thompson School District / 9,246 |
| 16. | 39.6% | Windsor Locks School District / 12,422 |
| 17. | 39.0% | Montville School District / 19,793 |
| 18. | 38.9% | Preston School District / 4,919 |
| 19. | 38.8% | Bristol School District / 60,869 |
| 20. | 38.4% | Seymour School District / 16,163 |
| 21. | 38.2% | Canterbury School District / 5,077 |
| 22. | 38.1% | Thomaston School District / 7,826 |
| 23. | 37.9% | Naugatuck School District / 31,827 |
| 24. | 37.9% | Regional High School District 11 / 6,406 |
| 25. | 37.5% | Waterbury School District / 106,909 |
| 26. | 37.2% | Enfield School District / 45,060 |
| 27. | 37.1% | Torrington School District / 35,495 |
| 28. | 36.9% | Wolcott School District / 16,297 |
| 29. | 36.6% | Norwich School District / 36,596 |
| 30. | 36.5% | Union School District / 667 |
| 31. | 36.4% | Franklin School District / 1,815 |
| 32. | 36.0% | Bozrah School District / 2,414 |
| 33. | 36.0% | Putnam School District / 9,272 |
| 34. | 36.0% | Brooklyn School District / 7,829 |
| 34. | 36.0% | Plymouth School District / 12,039 |
| 36. | 36.0% | New London School District / 26,123 |
| 37. | 35.9% | North Branford School District / 14,352 |
| 38. | 35.9% | Regional School District 16 / 15,019 |
| 39. | 35.5% | Winchester School District / 10,765 |
| 40. | 35.3% | North Canaan School District / 3,363 |
| 41. | 35.2% | Bridgeport School District / 136,715 |
| 42. | 35.2% | Kent School District / 2,947 |
| 43. | 34.7% | Ansonia School District / 18,530 |
| 44. | 34.0% | Voluntown School District / 2,629 |
| 45. | 33.9% | Meriden School District / 59,078 |
| 46. | 33.7% | Windham School District / 23,671 |
| 47. | 33.6% | New Britain School District / 70,548 |
| 48. | 33.4% | Oxford School District / 12,368 |
| 48. | 33.4% | Lebanon School District / 7,360 |
| 50. | 32.8% | Sharon School District / 3,021 |
| 51. | 32.7% | Pomfret School District / 4,145 |
| 52. | 32.5% | Hartford School District / 123,925 |
| 53. | 32.3% | Sprague School District / 2,999 |
| 54. | 32.2% | North Haven School District / 23,861 |
| 55. | 32.1% | Shelton School District / 39,669 |
| 56. | 32.1% | Ledyard School District / 15,159 |
| 57. | 32.1% | Ashford School District / 4,439 |
| 58. | 31.5% | Wallingford School District / 44,601 |
| 59. | 31.4% | Middletown School District / 47,702 |
| 60. | 31.2% | Waterford School District / 18,866 |
| 61. | 31.2% | Andover School District / 3,268 |
| 62. | 30.7% | Stratford School District / 48,930 |
| 63. | 30.7% | Portland School District / 9,536 |
| 64. | 30.6% | Watertown School District / 22,141 |
| 65. | 30.4% | Danbury School District / 78,708 |
| 66. | 30.1% | Vernon School District / 29,734 |
| 67. | 30.0% | Southington School District / 42,077 |
| 68. | 30.0% | Somers School District / 10,980 |
| 69. | 30.0% | Manchester School District / 55,740 |
| 70. | 29.7% | East Haddam School District / 8,845 |
| 71. | 29.5% | Coventry School District / 12,197 |
| 72. | 29.5% | Groton School District / 40,114 |
| 73. | 29.3% | New Milford School District / 28,443 |
| 74. | 29.3% | Bethel School District / 18,441 |
| 75. | 29.2% | Milford School District / 55,293 |
| 76. | 29.2% | Newington School District / 29,530 |
| 77. | 29.1% | Colchester School District / 15,536 |
| 78. | 29.1% | Regional School District 06 / 7,032 |
| 79. | 28.9% | Eastford School District / 1,693 |
| 80. | 28.7% | Hampton School District / 2,003 |
| 81. | 28.6% | New Haven School District / 123,628 |
| 82. | 28.6% | Hartland School District / 1,993 |
| 83. | 28.2% | Cromwell School District / 13,559 |
| 84. | 28.2% | Regional High School District 01 / 15,925 |
| 85. | 28.0% | Canaan School District / 1,140 |
| 85. | 28.0% | New Hartford School District / 6,722 |
| 87. | 28.0% | East Lyme School District / 18,819 |
| 88. | 27.8% | Woodstock School District / 8,133 |
| 89. | 27.8% | Rocky Hill School District / 18,731 |
| 90. | 27.8% | East Hampton School District / 12,507 |
| 91. | 27.6% | Clinton School District / 13,579 |
| 92. | 27.5% | Bolton School District / 5,135 |
| 93. | 27.5% | Wethersfield School District / 25,788 |
| 94. | 27.4% | Regional School District 10 / 14,648 |
| 95. | 27.3% | Westbrook School District / 6,624 |
| 96. | 27.3% | Suffield School District / 15,027 |
| 97. | 26.7% | Berlin School District / 20,059 |
| 98. | 26.7% | Columbia School District / 5,343 |
| 99. | 26.7% | Regional High School District 07 / 13,657 |
| 100. | 26.6% | Barkhamsted School District / 3,671 |
| 101. | 26.4% | Windsor School District / 28,747 |
| 102. | 26.2% | Stonington School District / 18,415 |
| 103. | 26.2% | New Fairfield School District / 14,043 |
| 104. | 26.2% | Regional School District 13 / 11,625 |
| 105. | 26.1% | Hamden School District / 57,863 |
| 106. | 26.1% | Name N/A / 213,921 |
| 107. | 26.0% | Colebrook School District / 1,541 |
| 108. | 25.9% | Marlborough School District / 6,292 |
| 109. | 25.9% | Old Saybrook School District / 10,517 |
| 110. | 25.9% | North Stonington School District / 5,243 |
| 111. | 25.6% | Chester School District / 3,829 |
| 112. | 25.5% | Regional School District 17 / 14,238 |
| 113. | 25.0% | Bloomfield School District / 20,468 |
| 114. | 25.0% | East Granby School District / 5,187 |
| 115. | 24.9% | South Windsor School District / 25,915 |
| 116. | 24.9% | Norwalk School District / 83,219 |
| 117. | 24.8% | Regional School District 14 / 13,233 |
| 118. | 24.6% | Deep River School District / 4,680 |
| 119. | 24.6% | Branford School District / 28,916 |
| 120. | 24.2% | Stamford School District / 118,787 |
| 121. | 24.2% | Regional School District 15 / 26,800 |
| 122. | 24.1% | Regional High School District 08 / 18,791 |
| 123. | 24.1% | Regional High School District 19 / 35,507 |
| 124. | 24.0% | Monroe School District / 19,340 |
| 125. | 23.9% | Trumbull School District / 34,671 |
| 126. | 23.7% | Tolland School District / 14,653 |
| 127. | 23.6% | Regional School District 12 / 7,629 |
| 128. | 23.3% | Willington School District / 6,163 |
| 129. | 23.2% | Regional High School District 04 / 15,272 |
| 130. | 22.8% | Ellington School District / 14,448 |
| 131. | 22.2% | Norfolk School District / 1,723 |
| 132. | 21.7% | Mansfield School District / 24,905 |
| 133. | 21.6% | Salem School District / 4,110 |
| 134. | 21.6% | Granby School District / 11,132 |
| 135. | 21.4% | Newtown School District / 26,679 |
| 136. | 21.3% | Guilford School District / 22,284 |
| 137. | 21.0% | Essex School District / 6,763 |
| 138. | 20.9% | Litchfield School District / 8,667 |
| 139. | 20.9% | Cheshire School District / 28,878 |
| 140. | 20.7% | Farmington School District / 24,935 |
| 141. | 20.1% | Hebron School District / 9,231 |
| 142. | 19.2% | Canton School District / 10,008 |
| 143. | 18.9% | Orange School District / 13,780 |
| 144. | 18.8% | Bethany School District / 5,510 |
| 145. | 18.8% | Cornwall School District / 1,459 |
| 146. | 18.7% | Brookfield School District / 16,372 |
| 147. | 18.3% | Glastonbury School District / 33,033 |
| 148. | 18.0% | Regional School District 18 / 9,655 |
| 149. | 17.5% | Salisbury School District / 3,995 |
| 150. | 17.3% | Regional High School District 05 / 28,477 |
| 151. | 16.2% | Redding School District / 8,757 |
| 152. | 16.2% | West Hartford School District / 60,573 |
| 153. | 16.1% | Greenwich School District / 61,672 |
| 154. | 16.0% | Sherman School District / 4,085 |
| 155. | 15.8% | Fairfield School District / 57,229 |
| 156. | 14.3% | Regional High School District 09 / 16,128 |
| 157. | 14.2% | Avon School District / 17,223 |
| 158. | 13.9% | Woodbridge School District / 9,187 |
| 159. | 13.8% | Madison School District / 18,726 |
| 160. | 12.1% | Ridgefield School District / 23,905 |
| 161. | 11.9% | Easton School District / 7,371 |
| 162. | 10.9% | Simsbury School District / 23,545 |
| 163. | 10.1% | Wilton School District / 17,689 |
| 164. | 9.3% | Darien School District / 20,176 |
| 165. | 8.9% | New Canaan School District / 19,805 |
| 166. | 7.9% | Westport School District / 26,443 |
| 167. | 7.2% | Weston School District / 10,137 |
Please note that we only rank locations with 'High School Graduate Education Percentage' data. The rank above might not be a complete list. Locations without 'High School Graduate Education Percentage' data are not listed.
*ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.
