| Rank | Irish as First Ancestry Population Percentage ▼ | School District / Population |
| 1. | 33.4% | Madison School District / 18,284 |
| 2. | 31.6% | New Fairfield School District / 14,079 |
| 3. | 30.0% | Sherman School District / 3,636 |
| 4. | 29.6% | East Haddam School District / 9,142 |
| 5. | 29.3% | Granby School District / 11,310 |
| 6. | 29.2% | Salem School District / 4,176 |
| 7. | 29.1% | Clinton School District / 13,188 |
| 8. | 28.6% | Columbia School District / 5,472 |
| 9. | 28.1% | Guilford School District / 22,405 |
| 10. | 27.9% | Portland School District / 9,483 |
| 11. | 27.2% | Darien School District / 21,190 |
| 12. | 27.2% | Tolland School District / 14,971 |
| 13. | 27.0% | Sharon School District / 2,746 |
| 14. | 27.0% | Colchester School District / 16,143 |
| 15. | 27.0% | Ridgefield School District / 25,025 |
| 16. | 26.7% | North Branford School District / 14,387 |
| 17. | 26.7% | Ellington School District / 15,725 |
| 18. | 26.4% | Fairfield School District / 60,678 |
| 19. | 26.4% | Coventry School District / 12,434 |
| 20. | 26.3% | Regional School District 18 / 9,954 |
| 21. | 26.2% | Regional School District 16 / 15,680 |
| 22. | 25.9% | Branford School District / 28,066 |
| 23. | 25.8% | Regional School District 12 / 7,549 |
| 24. | 25.8% | Thomaston School District / 7,793 |
| 25. | 25.7% | New Milford School District / 27,821 |
| 26. | 25.7% | Bolton School District / 4,963 |
| 26. | 25.7% | Milford School District / 53,039 |
| 28. | 25.5% | Wilton School District / 18,519 |
| 29. | 25.5% | Stafford School District / 12,013 |
| 30. | 25.4% | Colebrook School District / 1,594 |
| 31. | 25.3% | Andover School District / 3,181 |
| 31. | 25.3% | Old Saybrook School District / 10,222 |
| 33. | 25.2% | Hebron School District / 9,627 |
| 34. | 25.1% | Easton School District / 7,593 |
| 35. | 25.0% | Union School District / 950 |
| 36. | 24.9% | Regional High School District 09 / 16,860 |
| 37. | 24.8% | Litchfield School District / 8,365 |
| 38. | 24.8% | Redding School District / 9,267 |
| 39. | 24.7% | Bethel School District / 19,078 |
| 40. | 24.6% | Cheshire School District / 29,272 |
| 40. | 24.6% | East Windsor School District / 11,353 |
| 42. | 24.5% | Orange School District / 13,947 |
| 43. | 24.4% | Simsbury School District / 23,681 |
| 44. | 24.4% | Regional High School District 08 / 19,236 |
| 45. | 24.3% | Hampton School District / 1,912 |
| 46. | 24.2% | Norfolk School District / 1,486 |
| 47. | 24.1% | Watertown School District / 22,286 |
| 48. | 24.1% | North Canaan School District / 3,262 |
| 49. | 23.9% | Essex School District / 6,643 |
| 50. | 23.9% | Stonington School District / 18,539 |
| 51. | 23.8% | East Lyme School District / 19,118 |
| 52. | 23.6% | East Hampton School District / 12,936 |
| 53. | 23.6% | Bethany School District / 5,546 |
| 54. | 23.6% | Regional School District 14 / 13,402 |
| 55. | 23.5% | Regional School District 06 / 6,635 |
| 56. | 23.5% | Ledyard School District / 15,090 |
| 57. | 23.4% | Enfield School District / 44,713 |
| 58. | 23.2% | Suffield School District / 15,764 |
| 59. | 23.1% | Regional High School District 01 / 15,412 |
| 60. | 23.0% | Winchester School District / 11,089 |
| 60. | 23.0% | Glastonbury School District / 34,661 |
| 62. | 22.9% | Regional School District 17 / 14,872 |
| 62. | 22.9% | Regional School District 15 / 27,451 |
| 64. | 22.7% | Marlborough School District / 6,428 |
| 64. | 22.7% | Newtown School District / 27,960 |
| 66. | 22.6% | Avon School District / 18,298 |
| 67. | 22.5% | Ashford School District / 4,297 |
| 68. | 22.4% | Vernon School District / 29,162 |
| 69. | 22.4% | Cornwall School District / 1,505 |
| 70. | 22.3% | Somers School District / 11,431 |
| 71. | 22.3% | Oxford School District / 12,831 |
| 72. | 22.3% | Naugatuck School District / 31,790 |
| 73. | 22.3% | Kent School District / 2,951 |
| 74. | 22.1% | Chester School District / 4,223 |
| 74. | 22.1% | Southington School District / 43,509 |
| 76. | 22.0% | Trumbull School District / 36,444 |
| 77. | 21.9% | Wallingford School District / 45,154 |
| 77. | 21.9% | Waterford School District / 19,499 |
| 79. | 21.9% | Windsor Locks School District / 12,554 |
| 80. | 21.8% | Brookfield School District / 16,774 |
| 81. | 21.7% | Regional High School District 05 / 28,462 |
| 82. | 21.6% | Name N/A / 218,438 |
| 83. | 21.6% | Bozrah School District / 2,631 |
| 84. | 21.5% | Monroe School District / 19,744 |
| 85. | 21.4% | Regional School District 13 / 11,797 |
| 86. | 21.4% | East Granby School District / 5,098 |
| 87. | 21.2% | Barkhamsted School District / 3,749 |
| 88. | 21.2% | Wolcott School District / 16,724 |
| 89. | 21.1% | Regional High School District 07 / 13,739 |
| 90. | 21.1% | Canaan School District / 1,240 |
| 91. | 21.0% | Mansfield School District / 26,328 |
| 92. | 20.8% | Canterbury School District / 5,110 |
| 93. | 20.8% | Cromwell School District / 14,077 |
| 94. | 20.8% | Regional High School District 19 / 36,619 |
| 95. | 20.7% | Weston School District / 10,319 |
| 96. | 20.6% | Shelton School District / 40,472 |
| 97. | 20.6% | Salisbury School District / 3,708 |
| 97. | 20.6% | Regional High School District 04 / 15,477 |
| 99. | 20.5% | Thompson School District / 9,390 |
| 100. | 20.5% | Griswold School District / 11,952 |
| 101. | 20.2% | South Windsor School District / 25,795 |
| 102. | 20.2% | Regional School District 10 / 15,035 |
| 103. | 20.1% | Regional High School District 11 / 5,877 |
| 104. | 20.0% | Ansonia School District / 19,128 |
| 105. | 20.0% | Preston School District / 4,735 |
| 106. | 19.7% | West Hartford School District / 63,396 |
| 107. | 19.6% | Plainfield School District / 15,270 |
| 108. | 19.6% | Wethersfield School District / 26,579 |
| 109. | 19.6% | Scotland School District / 1,709 |
| 110. | 19.6% | New Hartford School District / 6,910 |
| 111. | 19.5% | Westbrook School District / 6,916 |
| 112. | 19.5% | Pomfret School District / 4,216 |
| 113. | 19.4% | Seymour School District / 16,551 |
| 113. | 19.4% | North Stonington School District / 5,293 |
| 115. | 19.4% | Hartland School District / 2,211 |
| 116. | 19.3% | Plainville School District / 17,791 |
| 117. | 19.3% | Voluntown School District / 2,602 |
| 118. | 19.1% | Sterling School District / 3,809 |
| 119. | 18.9% | Canton School District / 10,334 |
| 120. | 18.8% | Torrington School District / 35,774 |
| 121. | 18.8% | Willington School District / 5,994 |
| 122. | 18.7% | Montville School District / 19,649 |
| 123. | 18.7% | Killingly School District / 17,281 |
| 124. | 18.6% | Groton School District / 40,136 |
| 124. | 18.6% | New Canaan School District / 20,073 |
| 124. | 18.6% | East Haven School District / 29,139 |
| 127. | 18.5% | Plymouth School District / 12,085 |
| 128. | 18.4% | Franklin School District / 1,993 |
| 129. | 18.4% | Westport School District / 27,055 |
| 130. | 18.3% | Woodstock School District / 7,916 |
| 131. | 18.1% | Farmington School District / 25,515 |
| 132. | 18.0% | Lebanon School District / 7,314 |
| 133. | 18.0% | North Haven School District / 23,997 |
| 134. | 17.8% | Eastford School District / 1,726 |
| 135. | 17.7% | Manchester School District / 58,270 |
| 136. | 17.7% | Norwich School District / 40,378 |
| 137. | 17.7% | Stratford School District / 52,092 |
| 137. | 17.7% | Middletown School District / 47,424 |
| 139. | 17.6% | Rocky Hill School District / 19,838 |
| 140. | 17.2% | Bristol School District / 60,556 |
| 140. | 17.2% | Chaplin School District / 2,256 |
| 142. | 16.9% | Lisbon School District / 4,340 |
| 143. | 16.8% | West Haven School District / 55,290 |
| 144. | 16.5% | Hamden School District / 61,605 |
| 145. | 16.5% | Brooklyn School District / 8,240 |
| 146. | 16.3% | Woodbridge School District / 8,969 |
| 147. | 15.9% | Berlin School District / 20,352 |
| 148. | 15.8% | Greenwich School District / 62,141 |
| 149. | 15.6% | Newington School District / 30,652 |
| 150. | 14.8% | Windham School District / 25,271 |
| 151. | 14.7% | New London School District / 27,536 |
| 152. | 14.5% | Deep River School District / 4,611 |
| 153. | 14.1% | Danbury School District / 82,781 |
| 154. | 13.8% | Putnam School District / 9,515 |
| 155. | 13.5% | Meriden School District / 60,616 |
| 156. | 13.3% | Derby School District / 12,837 |
| 157. | 13.1% | Windsor School District / 29,130 |
| 158. | 12.8% | Norwalk School District / 87,214 |
| 159. | 12.2% | Sprague School District / 2,993 |
| 160. | 10.5% | Waterbury School District / 109,887 |
| 161. | 10.3% | Stamford School District / 125,401 |
| 162. | 10.1% | East Hartford School District / 51,211 |
| 163. | 8.9% | Bloomfield School District / 20,626 |
| 164. | 8.1% | New Britain School District / 73,095 |
| 165. | 7.2% | New Haven School District / 130,553 |
| 166. | 4.7% | Bridgeport School District / 146,680 |
| 167. | 3.5% | Hartford School District / 125,211 |
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.
