| Rank | Irish as First Ancestry Population Percentage ▼ | School District / Population |
| 1. | 33.5% | Marlborough School District / 6,382 |
| 2. | 32.4% | Sharon School District / 2,789 |
| 3. | 32.1% | Madison School District / 18,264 |
| 4. | 30.5% | Norfolk School District / 1,492 |
| 5. | 30.2% | East Haddam School District / 9,120 |
| 6. | 29.7% | New Fairfield School District / 13,932 |
| 7. | 29.2% | Bolton School District / 4,990 |
| 8. | 29.2% | Regional High School District 08 / 19,216 |
| 9. | 29.2% | Union School District / 954 |
| 10. | 29.1% | Clinton School District / 13,259 |
| 11. | 28.0% | Ridgefield School District / 24,648 |
| 12. | 27.9% | Hebron School District / 9,649 |
| 13. | 27.9% | Sherman School District / 3,615 |
| 14. | 27.7% | North Branford School District / 14,369 |
| 15. | 27.6% | Guilford School District / 22,353 |
| 16. | 27.6% | Portland School District / 9,500 |
| 17. | 27.4% | Simsbury School District / 23,535 |
| 18. | 27.4% | Regional School District 16 / 15,465 |
| 19. | 27.3% | Ellington School District / 15,549 |
| 20. | 27.2% | Windsor Locks School District / 12,500 |
| 21. | 27.2% | Coventry School District / 12,445 |
| 22. | 27.0% | Old Saybrook School District / 10,268 |
| 23. | 27.0% | Granby School District / 11,243 |
| 24. | 27.0% | Stonington School District / 18,528 |
| 25. | 26.9% | Fairfield School District / 59,562 |
| 26. | 26.9% | Milford School District / 52,826 |
| 27. | 26.8% | Bethany School District / 5,524 |
| 28. | 26.7% | Columbia School District / 5,464 |
| 29. | 26.4% | Darien School District / 20,758 |
| 30. | 26.2% | Pomfret School District / 4,231 |
| 31. | 26.2% | Branford School District / 28,062 |
| 32. | 26.0% | Watertown School District / 22,449 |
| 33. | 25.9% | Hampton School District / 1,799 |
| 34. | 25.7% | Tolland School District / 14,980 |
| 35. | 25.6% | Redding School District / 9,148 |
| 36. | 25.5% | Wilton School District / 18,201 |
| 37. | 25.5% | Colchester School District / 16,044 |
| 38. | 25.5% | Cheshire School District / 29,253 |
| 39. | 25.3% | Regional School District 14 / 13,519 |
| 40. | 25.3% | Stafford School District / 12,058 |
| 41. | 25.2% | Regional High School District 09 / 16,649 |
| 42. | 25.2% | New Milford School District / 28,067 |
| 43. | 25.1% | Bethel School District / 18,704 |
| 43. | 25.1% | East Hampton School District / 12,953 |
| 45. | 25.1% | Essex School District / 6,682 |
| 46. | 25.0% | Regional School District 17 / 14,820 |
| 47. | 24.9% | Enfield School District / 44,699 |
| 48. | 24.8% | Eastford School District / 1,690 |
| 49. | 24.8% | Easton School District / 7,501 |
| 50. | 24.7% | Winchester School District / 11,189 |
| 51. | 24.6% | Regional School District 15 / 27,363 |
| 52. | 24.5% | Suffield School District / 15,692 |
| 53. | 24.5% | Colebrook School District / 1,493 |
| 54. | 24.4% | Oxford School District / 12,602 |
| 55. | 24.3% | Andover School District / 3,185 |
| 56. | 24.3% | Salisbury School District / 3,747 |
| 57. | 24.2% | Regional School District 18 / 9,959 |
| 58. | 24.1% | Regional School District 12 / 7,600 |
| 59. | 24.1% | Regional School District 13 / 11,794 |
| 60. | 24.0% | New Canaan School District / 19,794 |
| 61. | 23.9% | Newtown School District / 27,543 |
| 62. | 23.9% | Regional High School District 01 / 15,396 |
| 63. | 23.8% | Litchfield School District / 8,454 |
| 63. | 23.8% | Avon School District / 18,049 |
| 65. | 23.7% | Trumbull School District / 36,008 |
| 66. | 23.6% | Willington School District / 6,042 |
| 67. | 23.5% | Somers School District / 11,451 |
| 68. | 23.4% | Orange School District / 13,919 |
| 69. | 23.1% | East Windsor School District / 11,196 |
| 70. | 23.0% | Thompson School District / 9,429 |
| 71. | 23.0% | Sterling School District / 3,786 |
| 72. | 22.8% | Westbrook School District / 6,928 |
| 73. | 22.8% | Glastonbury School District / 34,401 |
| 74. | 22.8% | Thomaston School District / 7,865 |
| 75. | 22.7% | East Lyme School District / 19,168 |
| 76. | 22.7% | Regional High School District 04 / 15,408 |
| 77. | 22.6% | Chester School District / 4,090 |
| 78. | 22.6% | Name N/A / 217,821 |
| 79. | 22.5% | Wallingford School District / 45,047 |
| 80. | 22.5% | Regional School District 06 / 6,986 |
| 81. | 22.4% | Sprague School District / 2,982 |
| 82. | 22.3% | Southington School District / 43,038 |
| 83. | 22.2% | Voluntown School District / 2,599 |
| 84. | 22.0% | Canaan School District / 1,195 |
| 85. | 22.0% | Brookfield School District / 16,487 |
| 86. | 21.9% | Kent School District / 2,971 |
| 87. | 21.9% | New Hartford School District / 6,924 |
| 88. | 21.8% | Plymouth School District / 12,193 |
| 88. | 21.8% | Canterbury School District / 5,111 |
| 90. | 21.8% | Wolcott School District / 16,638 |
| 91. | 21.7% | Regional School District 10 / 14,913 |
| 92. | 21.7% | Waterford School District / 19,499 |
| 93. | 21.6% | Ledyard School District / 15,046 |
| 94. | 21.6% | Regional High School District 11 / 5,936 |
| 95. | 21.5% | Scotland School District / 1,725 |
| 95. | 21.5% | Regional High School District 05 / 28,433 |
| 95. | 21.5% | Regional High School District 07 / 13,700 |
| 98. | 21.5% | Bozrah School District / 2,605 |
| 99. | 21.0% | Cromwell School District / 14,059 |
| 100. | 20.9% | Preston School District / 4,736 |
| 101. | 20.6% | Regional High School District 19 / 36,530 |
| 102. | 20.6% | Vernon School District / 29,188 |
| 103. | 20.5% | Shelton School District / 39,641 |
| 104. | 20.4% | Canton School District / 10,243 |
| 105. | 20.4% | Woodstock School District / 7,934 |
| 106. | 20.3% | Wethersfield School District / 26,670 |
| 107. | 20.3% | Putnam School District / 9,562 |
| 108. | 20.3% | Torrington School District / 36,239 |
| 109. | 20.1% | East Haven School District / 29,188 |
| 110. | 20.0% | Monroe School District / 19,529 |
| 111. | 20.0% | Mansfield School District / 26,182 |
| 112. | 19.9% | North Stonington School District / 5,292 |
| 113. | 19.9% | Cornwall School District / 1,393 |
| 114. | 19.8% | Montville School District / 19,587 |
| 115. | 19.8% | Farmington School District / 25,329 |
| 116. | 19.8% | Weston School District / 10,203 |
| 117. | 19.6% | Naugatuck School District / 31,795 |
| 118. | 19.6% | Groton School District / 40,079 |
| 119. | 19.6% | Griswold School District / 11,907 |
| 120. | 19.5% | Lebanon School District / 7,289 |
| 121. | 19.4% | Ashford School District / 4,306 |
| 122. | 19.3% | North Haven School District / 24,037 |
| 123. | 19.3% | Deep River School District / 4,636 |
| 124. | 19.1% | Salem School District / 4,151 |
| 125. | 18.9% | Plainville School District / 17,726 |
| 126. | 18.8% | North Canaan School District / 3,301 |
| 127. | 18.8% | West Hartford School District / 63,157 |
| 128. | 18.7% | Franklin School District / 1,984 |
| 129. | 18.7% | South Windsor School District / 25,684 |
| 130. | 18.6% | Killingly School District / 17,345 |
| 131. | 18.4% | Plainfield School District / 15,358 |
| 132. | 18.4% | Chaplin School District / 2,412 |
| 133. | 18.3% | Seymour School District / 16,487 |
| 134. | 18.3% | Manchester School District / 58,078 |
| 135. | 18.3% | Bristol School District / 60,502 |
| 136. | 17.8% | Newington School District / 30,520 |
| 137. | 17.7% | Hartland School District / 2,198 |
| 138. | 17.7% | Hamden School District / 60,735 |
| 139. | 17.6% | Berlin School District / 19,974 |
| 140. | 17.4% | Norwich School District / 40,322 |
| 141. | 17.3% | Lisbon School District / 4,333 |
| 142. | 17.1% | Westport School District / 26,516 |
| 143. | 16.9% | Middletown School District / 47,530 |
| 144. | 16.6% | Greenwich School District / 61,428 |
| 145. | 16.4% | Stratford School District / 51,440 |
| 146. | 16.3% | Rocky Hill School District / 19,631 |
| 147. | 16.2% | West Haven School District / 55,386 |
| 148. | 16.1% | Barkhamsted School District / 3,791 |
| 149. | 16.0% | Meriden School District / 60,674 |
| 150. | 15.8% | Windham School District / 25,178 |
| 151. | 15.5% | Woodbridge School District / 8,990 |
| 152. | 15.3% | Ansonia School District / 19,188 |
| 153. | 15.2% | Norwalk School District / 85,853 |
| 154. | 14.9% | Brooklyn School District / 8,180 |
| 155. | 14.1% | Derby School District / 12,858 |
| 156. | 14.0% | East Granby School District / 5,055 |
| 157. | 13.9% | Danbury School District / 81,057 |
| 158. | 13.7% | New London School District / 27,613 |
| 159. | 13.6% | Windsor School District / 29,067 |
| 160. | 11.8% | Waterbury School District / 110,074 |
| 161. | 10.2% | East Hartford School District / 51,171 |
| 162. | 9.7% | Stamford School District / 122,878 |
| 163. | 8.3% | Bloomfield School District / 20,470 |
| 164. | 7.8% | New Britain School District / 73,122 |
| 165. | 7.2% | New Haven School District / 129,898 |
| 166. | 5.3% | Bridgeport School District / 144,446 |
| 167. | 3.9% | Hartford School District / 124,879 |
Please note that we only rank locations with 'Irish as First Ancestry Population Percentage' data. The rank above might not be a complete list. Locations without 'Irish as First Ancestry Population 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.
