| Rank | Average Family Size ▼ | School District / Population |
| 1. | 5.36 | Shannon County School District 65-1 / 13,593 |
| 2. | 5.04 | Todd County School District 66-1 / 9,997 |
| 3. | 4.87 | McLaughlin School District 15-2 / 2,430 |
| 4. | 4.21 | Smee School District 15-3 / 340 |
| 5. | 4.06 | Eagle Butte School District 20-1 / 4,823 |
| 6. | 4.04 | Dupree School District 64-2 / 1,729 |
| 7. | 4.02 | Tea Area School District 41-5 / 6,587 |
| 8. | 3.90 | Canton School District 41-1 / 6,718 |
| 9. | 3.80 | White River School District 47-1 / 1,687 |
| 10. | 3.76 | Harrisburg School District 41-2 / 11,628 |
| 11. | 3.76 | Name N/A / 573 |
| 12. | 3.71 | McIntosh School District 15-1 / 1,176 |
| 13. | 3.64 | Emery School District 30-2 / 1,038 |
| 14. | 3.64 | Lennox School District 41-4 / 7,284 |
| 15. | 3.62 | Leola School District 44-2 / 1,157 |
| 16. | 3.61 | Lyman School District 42-1 / 3,138 |
| 17. | 3.59 | Greater Hoyt School District 61-4 / 304 |
| 18. | 3.55 | Timber Lake School District 20-3 / 1,456 |
| 19. | 3.43 | Montrose School District 43-2 / 1,262 |
| 20. | 3.38 | Hanson School District 30-1 / 1,887 |
| 21. | 3.38 | Brandon Valley School District 49-2 / 14,324 |
| 22. | 3.37 | Kadoka School District 35-2 / 2,941 |
| 23. | 3.31 | Hamlin School District 28-3 / 3,230 |
| 24. | 3.31 | Garretson School District 49-4 / 2,459 |
| 25. | 3.31 | White Lake School District 01-3 / 901 |
| 26. | 3.30 | Sisseton School District 54-2 / 7,463 |
| 27. | 3.28 | Bennett County School District 03-1 / 3,408 |
| 28. | 3.27 | Chamberlain School District 07-1 / 6,258 |
| 29. | 3.27 | Wagner School District 11-4 / 3,846 |
| 30. | 3.24 | Elk Point-Jefferson School District 61-7 / 4,009 |
| 31. | 3.24 | Tripp-Delmont School District 33-5 / 1,782 |
| 32. | 3.24 | Avon School District 04-1 / 1,393 |
| 33. | 3.24 | Mount Vernon School District 17-3 / 1,059 |
| 34. | 3.23 | West Central School District 49-7 / 5,388 |
| 35. | 3.22 | Andes Central School District 11-1 / 1,828 |
| 36. | 3.22 | Name N/A / 476 |
| 37. | 3.20 | Name N/A / 458 |
| 38. | 3.20 | Newell School District 09-2 / 2,696 |
| 39. | 3.20 | Florence School District 14-1 / 893 |
| 40. | 3.19 | Elkton School District 05-3 / 1,511 |
| 41. | 3.19 | Elk Mountain School District 16-2 / 326 |
| 42. | 3.18 | Alcester-Hudson School District 61-1 / 2,345 |
| 43. | 3.16 | Sioux Falls School District 49-5 / 147,374 |
| 44. | 3.16 | Tri-Valley School District 49-6 / 4,217 |
| 45. | 3.16 | Kimball School District 07-2 / 1,343 |
| 46. | 3.14 | Douglas School District 51-1 / 10,803 |
| 47. | 3.13 | Wall School District 51-5 / 1,810 |
| 48. | 3.12 | Ethan School District 17-1 / 838 |
| 49. | 3.12 | Iroquois School District 02-3 / 1,115 |
| 50. | 3.12 | Castlewood School District 28-1 / 1,175 |
| 51. | 3.11 | Hitchcock-Tulare School District 56-6 / 1,365 |
| 52. | 3.10 | Colman-Egan School District 50-5 / 1,855 |
| 53. | 3.08 | Baltic School District 49-1 / 1,776 |
| 54. | 3.07 | Pierre School District 32-2 / 15,784 |
| 55. | 3.07 | Groton Area School District 06-6 / 3,840 |
| 56. | 3.06 | Colome Consolidated School District 59-3 / 1,267 |
| 57. | 3.06 | Bridgewater School District 43-6 / 975 |
| 58. | 3.06 | Canistota School District 43-1 / 1,126 |
| 59. | 3.06 | Gayville-Volin School District 63-1 / 1,262 |
| 60. | 3.06 | Greater Scott School District 61-5 / 121 |
| 61. | 3.05 | Beresford School District 61-2 / 3,234 |
| 62. | 3.05 | Summit School District 54-6 / 557 |
| 63. | 3.04 | Rapid City School District 51-4 / 86,808 |
| 64. | 3.04 | Estelline School District 28-2 / 1,875 |
| 65. | 3.03 | New Underwood School District 51-3 / 1,394 |
| 66. | 3.02 | Flandreau School District 50-3 / 3,862 |
| 67. | 3.02 | Centerville School District 60-1 / 1,803 |
| 68. | 3.02 | Dakota Valley School District 61-8 / 5,839 |
| 69. | 3.02 | Belle Fourche School District 09-1 / 6,846 |
| 70. | 3.02 | Viborg School District 60-5 / 1,504 |
| 71. | 3.00 | Madison Central School District 39-2 / 8,824 |
| 72. | 3.00 | Stanley County School District 57-1 / 2,775 |
| 73. | 3.00 | Warner School District 06-5 / 836 |
| 74. | 3.00 | Dell Rapids School District 49-3 / 4,573 |
| 75. | 2.99 | Sioux Valley School District 05-5 / 3,296 |
| 76. | 2.99 | Platte-Geddes School District 11-5 / 3,159 |
| 77. | 2.99 | Freeman School District 33-1 / 2,439 |
| 78. | 2.99 | Faulkton School District 24-4 / 2,010 |
| 79. | 2.96 | Bon Homme School District 04-2 / 4,722 |
| 80. | 2.95 | Bowdle School District 22-1 / 795 |
| 81. | 2.95 | Bison School District 52-1 / 1,038 |
| 82. | 2.94 | Chester School District 39-1 / 1,743 |
| 83. | 2.94 | Parkston School District 33-3 / 2,955 |
| 84. | 2.93 | Deubrook School District 05-6 / 1,842 |
| 85. | 2.93 | Oelrichs School District 23-3 / 347 |
| 86. | 2.93 | Ipswich School District 22-6 / 2,238 |
| 87. | 2.92 | Rutland School District 39-4 / 701 |
| 88. | 2.92 | Edmunds Central School District 22-5 / 1,136 |
| 89. | 2.92 | Mitchell School District 17-2 / 17,608 |
| 90. | 2.92 | Brookings School District 05-1 / 23,113 |
| 91. | 2.90 | Aberdeen School District 06-1 / 29,441 |
| 92. | 2.90 | Stickney School District 01-2 / 640 |
| 93. | 2.90 | Watertown School District 14-4 / 23,847 |
| 94. | 2.89 | Henry School District 14-2 / 511 |
| 95. | 2.89 | Grant-Deuel School District 25-3 / 1,076 |
| 96. | 2.88 | Menno School District 33-2 / 1,491 |
| 97. | 2.88 | Sanborn Central School District 55-5 / 1,210 |
| 98. | 2.88 | Harding County School District 31-1 / 1,205 |
| 99. | 2.87 | Lead-Deadwood School District 40-1 / 6,664 |
| 100. | 2.86 | Rosholt School District 54-4 / 925 |
| 101. | 2.86 | McCook Central School District 43-7 / 2,153 |
| 102. | 2.86 | Britton-Hecla School District 45-4 / 3,096 |
| 103. | 2.85 | Meade School District 46-1 / 17,737 |
| 104. | 2.85 | Parker School District 60-4 / 1,897 |
| 105. | 2.84 | Big Stone City School District 25-1 / 749 |
| 106. | 2.84 | Wilmot School District 54-7 / 1,846 |
| 107. | 2.84 | Irene-Wakonda School District 13-3 / 2,206 |
| 108. | 2.84 | Frederick Area School District 06-2 / 1,005 |
| 109. | 2.83 | Willow Lake School District 12-3 / 1,180 |
| 110. | 2.82 | Agar-Blunt-Onida School District 58-3 / 1,995 |
| 111. | 2.81 | Waubay School District 18-3 / 1,190 |
| 112. | 2.81 | Jones County School District 37-3 / 1,053 |
| 113. | 2.81 | Woonsocket School District 55-4 / 1,361 |
| 114. | 2.81 | Northwestern Area School District 56-7 / 1,569 |
| 115. | 2.80 | Waverly School District 14-5 / 496 |
| 116. | 2.80 | Doland School District 56-2 / 965 |
| 117. | 2.79 | Vermillion School District 13-1 / 11,829 |
| 118. | 2.79 | Roslyn School District 18-2 / 736 |
| 119. | 2.78 | Spearfish School District 40-2 / 14,927 |
| 120. | 2.78 | Redfield School District 56-4 / 3,552 |
| 121. | 2.77 | Name N/A / 2,842 |
| 122. | 2.77 | Yankton School District 63-3 / 19,111 |
| 123. | 2.77 | Hurley School District 60-2 / 840 |
| 124. | 2.76 | Howard School District 48-3 / 2,214 |
| 125. | 2.74 | Clark School District 12-2 / 2,327 |
| 126. | 2.74 | Webster School District 18-4 / 2,702 |
| 127. | 2.73 | Lake Preston School District 38-3 / 1,239 |
| 128. | 2.73 | Deuel School District 19-4 / 3,091 |
| 129. | 2.73 | Name N/A / 149 |
| 130. | 2.72 | Name N/A / 1,453 |
| 131. | 2.72 | South Central School District 26-5 / 941 |
| 132. | 2.72 | Plankinton School District 01-1 / 1,305 |
| 133. | 2.71 | Arlington School District 38-1 / 1,776 |
| 134. | 2.70 | Huron School District 02-2 / 13,649 |
| 135. | 2.70 | Armour School District 21-1 / 931 |
| 136. | 2.70 | Name N/A / 365 |
| 137. | 2.69 | Hot Springs School District 23-2 / 6,116 |
| 138. | 2.69 | Wolsey-Wessington School District 02-6 / 1,155 |
| 139. | 2.68 | Corsica School District 21-2 / 1,123 |
| 140. | 2.68 | Eureka School District 44-1 / 1,404 |
| 141. | 2.67 | Gregory School District 26-4 / 2,129 |
| 142. | 2.67 | Haakon School District 27-1 / 1,624 |
| 143. | 2.66 | Herreid School District 10-1 / 576 |
| 144. | 2.66 | Marion School District 60-3 / 1,581 |
| 145. | 2.66 | Wessington Springs School District 36-2 / 1,873 |
| 146. | 2.65 | Name N/A / 573 |
| 147. | 2.65 | Burke School District 26-2 / 1,127 |
| 148. | 2.64 | Hoven School District 53-2 / 957 |
| 149. | 2.64 | Hill City School District 51-2 / 3,230 |
| 150. | 2.63 | Winner School District 59-2 / 4,297 |
| 151. | 2.63 | Oldham-Ramona School District 39-5 / 926 |
| 152. | 2.63 | Gettysburg School District 53-1 / 1,354 |
| 153. | 2.63 | Custer School District 16-1 / 7,499 |
| 154. | 2.60 | Selby School District 62-5 / 1,842 |
| 155. | 2.59 | Scotland School District 04-3 / 1,850 |
| 156. | 2.57 | Faith School District 46-2 / 652 |
| 157. | 2.54 | Name N/A / 462 |
| 158. | 2.53 | Milbank School District 25-4 / 5,205 |
| 159. | 2.51 | Langford School District 45-2 / 1,325 |
| 160. | 2.50 | De Smet School District 38-2 / 1,762 |
| 161. | 2.44 | Lemmon School District 52-4 / 1,654 |
| 162. | 2.41 | Name N/A / 159 |
| 163. | 2.38 | Name N/A / 3,522 |
| 164. | 2.38 | Edgemont School District 23-1 / 1,082 |
| 165. | 2.30 | Name N/A / 248 |
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.
