| Rank | Average Family Size ▼ | School District / Population |
| 1. | 5.64 | Smee School District 15-3 / 391 |
| 2. | 5.38 | Shannon County School District 65-1 / 13,683 |
| 3. | 4.70 | McLaughlin School District 15-2 / 2,637 |
| 4. | 4.38 | Todd County School District 66-1 / 9,711 |
| 5. | 4.17 | Eagle Butte School District 20-1 / 4,666 |
| 6. | 3.93 | Andes Central School District 11-1 / 2,075 |
| 7. | 3.90 | Dupree School District 64-2 / 1,957 |
| 8. | 3.87 | Hanson School District 30-1 / 1,930 |
| 9. | 3.83 | Summit School District 54-6 / 627 |
| 10. | 3.83 | Wagner School District 11-4 / 3,795 |
| 11. | 3.80 | White River School District 47-1 / 1,754 |
| 12. | 3.73 | Lyman School District 42-1 / 2,902 |
| 13. | 3.72 | Bennett County School District 03-1 / 3,432 |
| 14. | 3.65 | Waubay School District 18-3 / 1,220 |
| 15. | 3.62 | White Lake School District 01-3 / 795 |
| 16. | 3.61 | Sisseton School District 54-2 / 7,893 |
| 17. | 3.59 | Willow Lake School District 12-3 / 1,111 |
| 18. | 3.53 | Avon School District 04-1 / 1,416 |
| 19. | 3.47 | West Central School District 49-7 / 6,282 |
| 20. | 3.45 | McIntosh School District 15-1 / 777 |
| 21. | 3.43 | Grant-Deuel School District 25-3 / 1,163 |
| 22. | 3.42 | Hitchcock-Tulare School District 56-6 / 1,378 |
| 23. | 3.42 | Emery School District 30-2 / 1,864 |
| 24. | 3.41 | Newell School District 09-2 / 2,806 |
| 25. | 3.39 | Florence School District 14-1 / 1,109 |
| 26. | 3.37 | Hamlin School District 28-3 / 3,507 |
| 27. | 3.37 | Kadoka School District 35-2 / 3,339 |
| 28. | 3.32 | Jones County School District 37-3 / 1,062 |
| 29. | 3.32 | Brandon Valley School District 49-2 / 16,069 |
| 30. | 3.32 | Garretson School District 49-4 / 2,770 |
| 31. | 3.31 | Estelline School District 28-2 / 1,650 |
| 32. | 3.28 | Highmore-Harrold School District 34-2 / 2,000 |
| 33. | 3.27 | Dakota Valley School District 61-8 / 6,333 |
| 34. | 3.26 | Douglas School District 51-1 / 11,838 |
| 35. | 3.25 | Tripp-Delmont School District 33-5 / 1,674 |
| 36. | 3.22 | Tea Area School District 41-5 / 6,017 |
| 37. | 3.19 | Elkton School District 05-3 / 1,417 |
| 38. | 3.19 | Belle Fourche School District 09-1 / 7,415 |
| 39. | 3.18 | Timber Lake School District 20-3 / 1,594 |
| 40. | 3.18 | Elk Point-Jefferson School District 61-7 / 4,176 |
| 41. | 3.16 | Rosholt School District 54-4 / 1,114 |
| 42. | 3.16 | Sioux Valley School District 05-5 / 3,640 |
| 43. | 3.15 | Clark School District 12-2 / 2,533 |
| 44. | 3.14 | Bowdle School District 22-1 / 805 |
| 45. | 3.13 | Britton-Hecla School District 45-4 / 3,079 |
| 46. | 3.13 | Harrisburg School District 41-2 / 16,573 |
| 47. | 3.13 | Wall School District 51-5 / 1,721 |
| 48. | 3.11 | Vermillion School District 13-1 / 12,245 |
| 49. | 3.10 | Oelrichs School District 23-3 / 485 |
| 50. | 3.10 | Faulkton School District 24-4 / 2,109 |
| 51. | 3.10 | Sioux Falls School District 49-5 / 144,005 |
| 52. | 3.10 | Colman-Egan School District 50-5 / 1,995 |
| 53. | 3.09 | Canton School District 41-1 / 5,158 |
| 54. | 3.09 | Baltic School District 49-1 / 2,146 |
| 55. | 3.09 | Ethan School District 17-1 / 885 |
| 56. | 3.09 | Castlewood School District 28-1 / 1,204 |
| 57. | 3.08 | Iroquois School District 02-3 / 1,154 |
| 58. | 3.08 | Plankinton School District 01-1 / 1,226 |
| 59. | 3.08 | Dell Rapids School District 49-3 / 5,229 |
| 60. | 3.06 | Chamberlain School District 07-1 / 6,450 |
| 61. | 3.06 | Aberdeen School District 06-1 / 30,905 |
| 62. | 3.05 | Montrose School District 43-2 / 1,075 |
| 63. | 3.05 | Mount Vernon School District 17-3 / 999 |
| 64. | 3.05 | Hurley School District 60-2 / 766 |
| 65. | 3.05 | Redfield School District 56-4 / 3,349 |
| 66. | 3.04 | Huron School District 02-2 / 15,321 |
| 67. | 3.04 | Groton Area School District 06-6 / 3,829 |
| 68. | 3.04 | Deubrook School District 05-6 / 1,851 |
| 69. | 3.04 | Lennox School District 41-4 / 5,433 |
| 70. | 3.03 | Mobridge-Pollock School District 62-6 / 4,194 |
| 71. | 3.03 | Rutland School District 39-4 / 642 |
| 72. | 3.02 | Henry School District 14-2 / 583 |
| 73. | 3.02 | Rapid City School District 51-4 / 91,759 |
| 74. | 3.02 | Madison Central School District 39-2 / 8,762 |
| 75. | 3.02 | Wilmot School District 54-7 / 1,559 |
| 76. | 3.02 | Brookings School District 05-1 / 25,456 |
| 77. | 3.02 | Freeman School District 33-1 / 2,474 |
| 78. | 3.01 | Tri-Valley School District 49-6 / 4,939 |
| 79. | 3.01 | Deuel School District 19-4 / 3,245 |
| 80. | 3.01 | Pierre School District 32-2 / 15,885 |
| 81. | 3.00 | Irene-Wakonda School District 13-3 / 2,466 |
| 82. | 3.00 | Watertown School District 14-4 / 24,542 |
| 83. | 2.99 | Alcester-Hudson School District 61-1 / 2,326 |
| 84. | 2.99 | Agar-Blunt-Onida School District 58-3 / 1,998 |
| 85. | 2.98 | Ipswich School District 22-6 / 2,281 |
| 86. | 2.97 | New Underwood School District 51-3 / 1,204 |
| 87. | 2.97 | Yankton School District 63-3 / 19,771 |
| 88. | 2.96 | Waverly School District 14-5 / 1,246 |
| 89. | 2.96 | Armour School District 21-1 / 1,034 |
| 90. | 2.96 | Beresford School District 61-2 / 3,647 |
| 91. | 2.96 | Parker School District 60-4 / 1,940 |
| 92. | 2.95 | Frederick Area School District 06-2 / 1,068 |
| 93. | 2.95 | Sanborn Central School District 55-5 / 1,174 |
| 94. | 2.94 | Hot Springs School District 23-2 / 5,363 |
| 95. | 2.94 | Centerville School District 60-1 / 1,539 |
| 96. | 2.94 | Parkston School District 33-3 / 3,004 |
| 97. | 2.93 | Faith School District 46-2 / 739 |
| 98. | 2.92 | Meade School District 46-1 / 18,268 |
| 99. | 2.92 | Langford School District 45-2 / 1,534 |
| 100. | 2.92 | Platte-Geddes School District 11-5 / 2,848 |
| 101. | 2.90 | McCook Central School District 43-7 / 2,385 |
| 102. | 2.90 | Bison School District 52-1 / 776 |
| 103. | 2.90 | Marion School District 60-3 / 1,510 |
| 104. | 2.90 | Wolsey-Wessington School District 02-6 / 1,246 |
| 105. | 2.89 | Mitchell School District 17-2 / 18,130 |
| 106. | 2.88 | Edmunds Central School District 22-5 / 1,174 |
| 107. | 2.88 | Warner School District 06-5 / 995 |
| 108. | 2.88 | Doland School District 56-2 / 970 |
| 109. | 2.87 | Colome Consolidated School District 59-3 / 1,584 |
| 110. | 2.87 | Leola School District 44-2 / 1,164 |
| 111. | 2.86 | Canistota School District 43-1 / 1,011 |
| 112. | 2.86 | Woonsocket School District 55-4 / 1,250 |
| 113. | 2.86 | Bon Homme School District 04-2 / 4,767 |
| 114. | 2.85 | Gregory School District 26-4 / 2,114 |
| 115. | 2.85 | Lake Preston School District 38-3 / 1,256 |
| 116. | 2.85 | Howard School District 48-3 / 2,318 |
| 117. | 2.85 | Stanley County School District 57-1 / 2,940 |
| 118. | 2.85 | Chester School District 39-1 / 1,746 |
| 119. | 2.84 | Harding County School District 31-1 / 1,367 |
| 120. | 2.84 | Viborg School District 60-5 / 1,599 |
| 121. | 2.84 | Stickney School District 01-2 / 691 |
| 122. | 2.83 | Northwestern Area School District 56-7 / 1,830 |
| 123. | 2.83 | South Central School District 26-5 / 946 |
| 124. | 2.82 | Hoven School District 53-2 / 974 |
| 125. | 2.82 | Haakon School District 27-1 / 1,602 |
| 126. | 2.82 | Edgemont School District 23-1 / 1,355 |
| 127. | 2.82 | Flandreau School District 50-3 / 3,559 |
| 128. | 2.81 | Gettysburg School District 53-1 / 1,473 |
| 129. | 2.80 | Lemmon School District 52-4 / 2,054 |
| 130. | 2.80 | Custer School District 16-1 / 8,135 |
| 131. | 2.79 | Lead-Deadwood School District 40-1 / 6,755 |
| 132. | 2.78 | Miller Area School District 29-4 / 3,079 |
| 133. | 2.78 | Gayville-Volin School District 63-1 / 1,054 |
| 134. | 2.77 | Eureka School District 44-1 / 1,407 |
| 135. | 2.76 | Burke School District 26-2 / 1,330 |
| 136. | 2.76 | Big Stone City School District 25-1 / 758 |
| 137. | 2.75 | Selby School District 62-5 / 1,618 |
| 138. | 2.75 | Menno School District 33-2 / 1,444 |
| 139. | 2.74 | Wessington Springs School District 36-2 / 1,816 |
| 140. | 2.70 | Spearfish School District 40-2 / 15,310 |
| 141. | 2.69 | Herreid School District 10-1 / 684 |
| 142. | 2.69 | Scotland School District 04-3 / 1,841 |
| 143. | 2.69 | Oldham-Ramona School District 39-5 / 976 |
| 144. | 2.68 | Webster School District 18-4 / 3,237 |
| 145. | 2.67 | Winner School District 59-2 / 4,308 |
| 146. | 2.66 | Hill City School District 51-2 / 2,922 |
| 147. | 2.64 | Corsica School District 21-2 / 1,202 |
| 148. | 2.63 | Arlington School District 38-1 / 1,748 |
| 149. | 2.62 | Milbank School District 25-4 / 5,338 |
| 150. | 2.59 | Kimball School District 07-2 / 1,189 |
| 151. | 2.58 | Elk Mountain School District 16-2 / 291 |
| 152. | 2.57 | De Smet School District 38-2 / 1,634 |
Please note that we only rank locations with 'Average Family Size' data. The rank above might not be a complete list. Locations without 'Average Family Size' 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.
