| Rank | High School Graduate Education Percentage ▼ | School District / Population |
| 1. | 43.9% | East Haven School District / 29,074 |
| 2. | 43.1% | Sterling School District / 3,727 |
| 3. | 42.3% | Lisbon School District / 4,306 |
| 4. | 41.6% | Plainfield School District / 15,384 |
| 5. | 41.2% | Griswold School District / 11,774 |
| 6. | 41.1% | Derby School District / 12,826 |
| 7. | 41.0% | Union School District / 865 |
| 8. | 40.7% | Plainville School District / 17,625 |
| 9. | 40.4% | Stafford School District / 12,046 |
| 10. | 40.3% | Thompson School District / 9,434 |
| 11. | 40.0% | Scotland School District / 1,771 |
| 12. | 39.8% | Canterbury School District / 5,091 |
| 13. | 39.7% | Chaplin School District / 2,362 |
| 14. | 39.7% | West Haven School District / 55,070 |
| 15. | 39.5% | Killingly School District / 17,347 |
| 16. | 39.5% | Montville School District / 19,469 |
| 17. | 39.0% | Windsor Locks School District / 12,419 |
| 18. | 39.0% | Bristol School District / 60,466 |
| 19. | 38.1% | East Hartford School District / 50,974 |
| 20. | 37.9% | Seymour School District / 16,367 |
| 21. | 37.8% | Brooklyn School District / 8,093 |
| 22. | 37.7% | Bozrah School District / 2,590 |
| 22. | 37.7% | Torrington School District / 36,423 |
| 24. | 37.6% | Wolcott School District / 16,446 |
| 25. | 37.2% | Naugatuck School District / 31,746 |
| 26. | 37.1% | North Canaan School District / 3,354 |
| 27. | 36.8% | East Windsor School District / 10,921 |
| 28. | 36.6% | Putnam School District / 9,564 |
| 29. | 36.2% | Preston School District / 4,721 |
| 30. | 36.1% | Waterbury School District / 109,941 |
| 31. | 36.1% | Enfield School District / 44,794 |
| 32. | 36.1% | Franklin School District / 1,924 |
| 33. | 35.9% | Plymouth School District / 12,213 |
| 34. | 35.8% | Thomaston School District / 7,873 |
| 35. | 35.7% | Winchester School District / 11,221 |
| 36. | 35.6% | Windham School District / 25,036 |
| 36. | 35.6% | Regional High School District 11 / 5,997 |
| 38. | 34.7% | Norwich School District / 39,843 |
| 39. | 34.7% | Regional School District 16 / 15,191 |
| 40. | 34.6% | New Britain School District / 72,954 |
| 41. | 34.3% | Meriden School District / 60,484 |
| 42. | 34.3% | New London School District / 27,496 |
| 43. | 34.2% | Bridgeport School District / 142,576 |
| 44. | 33.8% | Ansonia School District / 19,163 |
| 45. | 33.6% | Sprague School District / 2,990 |
| 46. | 33.5% | North Branford School District / 14,331 |
| 47. | 33.4% | Lebanon School District / 7,253 |
| 48. | 32.6% | Oxford School District / 12,192 |
| 49. | 32.6% | Kent School District / 2,981 |
| 50. | 32.1% | Voluntown School District / 2,603 |
| 51. | 31.7% | Stratford School District / 50,821 |
| 52. | 31.6% | Wallingford School District / 44,786 |
| 53. | 31.6% | Hartford School District / 124,760 |
| 54. | 31.4% | Shelton School District / 39,061 |
| 55. | 31.4% | Portland School District / 9,422 |
| 56. | 31.2% | Ashford School District / 4,320 |
| 57. | 31.2% | Middletown School District / 47,349 |
| 58. | 31.1% | Regional School District 06 / 6,891 |
| 59. | 30.9% | Colebrook School District / 1,361 |
| 60. | 30.9% | Danbury School District / 79,371 |
| 61. | 30.9% | Watertown School District / 22,522 |
| 62. | 30.7% | Waterford School District / 19,430 |
| 63. | 30.6% | Deep River School District / 4,644 |
| 64. | 30.5% | Southington School District / 42,491 |
| 65. | 30.5% | North Haven School District / 23,927 |
| 66. | 30.4% | Pomfret School District / 4,197 |
| 67. | 30.3% | Ledyard School District / 15,023 |
| 68. | 30.2% | Westbrook School District / 6,860 |
| 69. | 30.2% | Newington School District / 30,361 |
| 70. | 30.1% | East Haddam School District / 9,038 |
| 71. | 29.9% | New Milford School District / 28,159 |
| 72. | 29.7% | Somers School District / 11,378 |
| 73. | 29.6% | Clinton School District / 13,316 |
| 74. | 29.4% | Woodstock School District / 7,892 |
| 75. | 29.3% | Bolton School District / 5,023 |
| 76. | 29.2% | New Haven School District / 128,885 |
| 77. | 29.1% | Sharon School District / 2,837 |
| 78. | 29.0% | Bethel School District / 18,377 |
| 79. | 29.0% | Vernon School District / 29,205 |
| 80. | 28.8% | North Stonington School District / 5,252 |
| 81. | 28.8% | Cromwell School District / 13,888 |
| 82. | 28.6% | Rocky Hill School District / 19,418 |
| 83. | 28.5% | Groton School District / 40,254 |
| 84. | 28.5% | Coventry School District / 12,354 |
| 85. | 28.5% | Hartland School District / 2,009 |
| 86. | 28.3% | Milford School District / 52,753 |
| 87. | 28.2% | Windsor School District / 28,947 |
| 88. | 28.2% | Columbia School District / 5,425 |
| 89. | 28.0% | Manchester School District / 57,650 |
| 90. | 28.0% | East Hampton School District / 12,891 |
| 91. | 27.7% | Wethersfield School District / 26,613 |
| 91. | 27.7% | Regional High School District 01 / 15,732 |
| 93. | 27.3% | Hamden School District / 60,293 |
| 94. | 27.3% | East Lyme School District / 19,067 |
| 95. | 27.1% | Canaan School District / 1,161 |
| 96. | 27.0% | Berlin School District / 19,591 |
| 97. | 27.0% | Marlborough School District / 6,287 |
| 98. | 26.9% | Andover School District / 3,246 |
| 99. | 26.9% | Stonington School District / 18,497 |
| 99. | 26.9% | Eastford School District / 1,626 |
| 101. | 26.7% | Regional School District 13 / 11,706 |
| 102. | 26.6% | Hampton School District / 1,864 |
| 103. | 26.5% | Colchester School District / 15,849 |
| 104. | 25.9% | East Granby School District / 5,161 |
| 105. | 25.8% | Name N/A / 216,484 |
| 106. | 25.8% | Suffield School District / 15,357 |
| 107. | 25.8% | Regional School District 10 / 14,721 |
| 108. | 25.6% | Barkhamsted School District / 3,781 |
| 109. | 25.5% | Norwalk School District / 84,611 |
| 110. | 25.5% | Branford School District / 28,194 |
| 111. | 25.4% | Regional High School District 07 / 13,679 |
| 112. | 25.4% | Regional School District 14 / 13,504 |
| 113. | 25.2% | New Fairfield School District / 13,800 |
| 114. | 25.1% | Monroe School District / 19,316 |
| 115. | 24.9% | Regional High School District 04 / 15,306 |
| 116. | 24.8% | Willington School District / 6,068 |
| 117. | 24.6% | New Hartford School District / 6,868 |
| 118. | 24.5% | Regional School District 12 / 7,569 |
| 119. | 24.3% | Regional High School District 08 / 19,104 |
| 120. | 24.3% | Trumbull School District / 35,495 |
| 121. | 24.2% | Regional School District 17 / 14,672 |
| 122. | 24.1% | Old Saybrook School District / 10,326 |
| 123. | 24.1% | Chester School District / 3,976 |
| 124. | 24.0% | Norfolk School District / 1,669 |
| 125. | 23.9% | South Windsor School District / 25,476 |
| 126. | 23.5% | Bloomfield School District / 20,334 |
| 127. | 23.4% | Ellington School District / 15,228 |
| 128. | 23.2% | Stamford School District / 120,907 |
| 129. | 22.4% | Salem School District / 4,107 |
| 130. | 22.4% | Regional High School District 19 / 36,243 |
| 131. | 22.3% | Regional School District 15 / 27,080 |
| 132. | 21.7% | Tolland School District / 14,809 |
| 133. | 21.7% | Litchfield School District / 8,512 |
| 134. | 21.5% | Essex School District / 6,686 |
| 135. | 21.5% | Hebron School District / 9,571 |
| 136. | 21.5% | Newtown School District / 26,957 |
| 137. | 21.1% | Guilford School District / 22,222 |
| 138. | 20.7% | Cheshire School District / 29,183 |
| 139. | 20.3% | Granby School District / 11,124 |
| 140. | 20.3% | Bethany School District / 5,467 |
| 141. | 19.9% | Farmington School District / 25,067 |
| 142. | 19.8% | Brookfield School District / 16,214 |
| 143. | 19.4% | Cornwall School District / 1,589 |
| 144. | 18.7% | Mansfield School District / 25,855 |
| 145. | 18.2% | Salisbury School District / 3,810 |
| 146. | 18.1% | Canton School District / 10,037 |
| 147. | 18.0% | Orange School District / 13,831 |
| 148. | 17.3% | Sherman School District / 3,604 |
| 149. | 17.0% | Glastonbury School District / 33,984 |
| 150. | 16.8% | West Hartford School District / 62,898 |
| 151. | 16.3% | Regional High School District 05 / 28,305 |
| 152. | 15.9% | Regional School District 18 / 9,912 |
| 153. | 15.8% | Fairfield School District / 58,727 |
| 154. | 15.6% | Redding School District / 8,945 |
| 155. | 15.3% | Greenwich School District / 60,809 |
| 156. | 14.0% | Avon School District / 17,678 |
| 157. | 13.9% | Regional High School District 09 / 16,348 |
| 158. | 11.8% | Easton School District / 7,403 |
| 159. | 11.7% | Madison School District / 18,229 |
| 160. | 11.7% | Ridgefield School District / 24,299 |
| 161. | 11.3% | Woodbridge School District / 9,007 |
| 162. | 10.9% | Simsbury School District / 23,477 |
| 163. | 9.1% | Wilton School District / 17,874 |
| 164. | 8.8% | Darien School District / 20,414 |
| 165. | 8.6% | Westport School District / 26,109 |
| 166. | 7.4% | New Canaan School District / 19,564 |
| 167. | 7.2% | Weston School District / 10,088 |
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.
