| Rank | Average Family Size ▼ | School District / Population |
| 1. | 4.73 | Shannon County School District 65-1 / 13,586 |
| 2. | 4.33 | Smee School District 15-3 / 467 |
| 3. | 3.95 | Todd County School District 66-1 / 9,612 |
| 4. | 3.91 | McLaughlin School District 15-2 / 2,456 |
| 5. | 3.81 | Eagle Butte School District 20-1 / 4,830 |
| 6. | 3.73 | Bennett County School District 03-1 / 3,431 |
| 7. | 3.72 | Dupree School District 64-2 / 1,790 |
| 8. | 3.58 | Kadoka School District 35-2 / 3,298 |
| 9. | 3.53 | Wagner School District 11-4 / 3,830 |
| 10. | 3.47 | White River School District 47-1 / 1,782 |
| 11. | 3.46 | Hamlin School District 28-3 / 3,314 |
| 12. | 3.35 | Lyman School District 42-1 / 2,974 |
| 13. | 3.34 | McIntosh School District 15-1 / 851 |
| 14. | 3.26 | Andes Central School District 11-1 / 2,242 |
| 14. | 3.26 | Tea Area School District 41-5 / 5,408 |
| 16. | 3.25 | Timber Lake School District 20-3 / 1,474 |
| 17. | 3.24 | Summit School District 54-6 / 620 |
| 18. | 3.23 | Sisseton School District 54-2 / 7,853 |
| 19. | 3.22 | Waubay School District 18-3 / 1,359 |
| 19. | 3.22 | Castlewood School District 28-1 / 1,394 |
| 21. | 3.21 | Chamberlain School District 07-1 / 6,044 |
| 22. | 3.20 | Florence School District 14-1 / 836 |
| 23. | 3.19 | Douglas School District 51-1 / 11,829 |
| 24. | 3.18 | Hanson School District 30-1 / 1,854 |
| 24. | 3.18 | Waverly School District 14-5 / 1,058 |
| 26. | 3.15 | Warner School District 06-5 / 1,130 |
| 26. | 3.15 | Brandon Valley School District 49-2 / 16,026 |
| 26. | 3.15 | West Central School District 49-7 / 6,058 |
| 29. | 3.14 | Harrisburg School District 41-2 / 15,963 |
| 30. | 3.12 | Garretson School District 49-4 / 2,474 |
| 30. | 3.12 | Baltic School District 49-1 / 1,967 |
| 32. | 3.10 | Gayville-Volin School District 63-1 / 1,030 |
| 32. | 3.10 | Dell Rapids School District 49-3 / 5,508 |
| 34. | 3.09 | Kimball School District 07-2 / 1,461 |
| 34. | 3.09 | Colman-Egan School District 50-5 / 1,663 |
| 36. | 3.08 | Emery School District 30-2 / 747 |
| 36. | 3.08 | Mount Vernon School District 17-3 / 998 |
| 36. | 3.08 | Tri-Valley School District 49-6 / 5,024 |
| 39. | 3.06 | Greater Hoyt School District 61-4 / 305 |
| 40. | 3.05 | Elk Point-Jefferson School District 61-7 / 3,907 |
| 40. | 3.05 | Lennox School District 41-4 / 5,988 |
| 40. | 3.05 | Faith School District 46-2 / 809 |
| 43. | 3.04 | Canton School District 41-1 / 5,582 |
| 43. | 3.04 | Frederick Area School District 06-2 / 965 |
| 43. | 3.04 | Ethan School District 17-1 / 788 |
| 46. | 3.03 | New Underwood School District 51-3 / 1,167 |
| 47. | 3.02 | Rutland School District 39-4 / 578 |
| 47. | 3.02 | Plankinton School District 01-1 / 1,281 |
| 49. | 3.01 | Sioux Falls School District 49-5 / 143,629 |
| 49. | 3.01 | Dakota Valley School District 61-8 / 6,278 |
| 51. | 3.00 | Highmore-Harrold School District 34-2 / 1,821 |
| 52. | 2.99 | Elkton School District 05-3 / 1,467 |
| 52. | 2.99 | White Lake School District 01-3 / 723 |
| 54. | 2.98 | Canistota School District 43-1 / 1,207 |
| 54. | 2.98 | Avon School District 04-1 / 1,158 |
| 54. | 2.98 | Doland School District 56-2 / 849 |
| 54. | 2.98 | Howard School District 48-3 / 2,375 |
| 58. | 2.97 | Flandreau School District 50-3 / 3,907 |
| 59. | 2.96 | Hitchcock-Tulare School District 56-6 / 1,335 |
| 59. | 2.96 | Platte-Geddes School District 11-5 / 3,157 |
| 59. | 2.96 | Belle Fourche School District 09-1 / 7,962 |
| 59. | 2.96 | Grant-Deuel School District 25-3 / 970 |
| 63. | 2.95 | Deubrook School District 05-6 / 1,902 |
| 64. | 2.94 | Corsica School District 21-2 / 1,241 |
| 64. | 2.94 | Montrose School District 43-2 / 1,120 |
| 64. | 2.94 | Huron School District 02-2 / 15,123 |
| 67. | 2.93 | Winner School District 59-2 / 4,660 |
| 67. | 2.93 | Brookings School District 05-1 / 25,450 |
| 67. | 2.93 | Willow Lake School District 12-3 / 1,060 |
| 67. | 2.93 | Sioux Valley School District 05-5 / 3,325 |
| 67. | 2.93 | Iroquois School District 02-3 / 1,227 |
| 67. | 2.93 | Colome Consolidated School District 59-3 / 1,212 |
| 67. | 2.93 | Deuel School District 19-4 / 3,327 |
| 67. | 2.93 | Rosholt School District 54-4 / 1,028 |
| 67. | 2.93 | Bridgewater School District 43-6 / 876 |
| 67. | 2.93 | Viborg School District 60-5 / 1,419 |
| 77. | 2.92 | Watertown School District 14-4 / 25,013 |
| 77. | 2.92 | Beresford School District 61-2 / 3,381 |
| 77. | 2.92 | Henry School District 14-2 / 534 |
| 80. | 2.91 | Parkston School District 33-3 / 2,950 |
| 80. | 2.91 | Rapid City School District 51-4 / 91,522 |
| 80. | 2.91 | Vermillion School District 13-1 / 12,235 |
| 80. | 2.91 | McCook Central School District 43-7 / 2,300 |
| 80. | 2.91 | Bowdle School District 22-1 / 758 |
| 85. | 2.90 | Mitchell School District 17-2 / 18,417 |
| 85. | 2.90 | Bison School District 52-1 / 912 |
| 87. | 2.89 | Pierre School District 32-2 / 16,064 |
| 87. | 2.89 | Milbank School District 25-4 / 5,743 |
| 87. | 2.89 | Groton Area School District 06-6 / 3,587 |
| 87. | 2.89 | Freeman School District 33-1 / 2,462 |
| 87. | 2.89 | Yankton School District 63-3 / 20,134 |
| 92. | 2.88 | Aberdeen School District 06-1 / 30,759 |
| 92. | 2.88 | Alcester-Hudson School District 61-1 / 2,273 |
| 92. | 2.88 | Wall School District 51-5 / 1,497 |
| 92. | 2.88 | Madison Central School District 39-2 / 8,762 |
| 92. | 2.88 | Parker School District 60-4 / 2,013 |
| 92. | 2.88 | Meade School District 46-1 / 18,211 |
| 92. | 2.88 | Burke School District 26-2 / 1,317 |
| 99. | 2.87 | Faulkton School District 24-4 / 2,112 |
| 99. | 2.87 | Chester School District 39-1 / 1,692 |
| 99. | 2.87 | Harding County School District 31-1 / 1,255 |
| 99. | 2.87 | Stanley County School District 57-1 / 2,966 |
| 99. | 2.87 | Haakon School District 27-1 / 1,697 |
| 104. | 2.86 | Leola School District 44-2 / 1,214 |
| 104. | 2.86 | Irene-Wakonda School District 13-3 / 2,024 |
| 104. | 2.86 | Estelline School District 28-2 / 1,589 |
| 104. | 2.86 | De Smet School District 38-2 / 1,727 |
| 104. | 2.86 | Jones County School District 37-3 / 993 |
| 104. | 2.86 | Centerville School District 60-1 / 1,510 |
| 110. | 2.85 | Stickney School District 01-2 / 729 |
| 110. | 2.85 | Hurley School District 60-2 / 946 |
| 112. | 2.84 | Redfield School District 56-4 / 3,549 |
| 112. | 2.84 | Edmunds Central School District 22-5 / 1,021 |
| 112. | 2.84 | Bon Homme School District 04-2 / 4,791 |
| 115. | 2.83 | Armour School District 21-1 / 1,054 |
| 115. | 2.83 | Miller Area School District 29-4 / 3,107 |
| 115. | 2.83 | Agar-Blunt-Onida School District 58-3 / 1,915 |
| 115. | 2.83 | Gregory School District 26-4 / 2,190 |
| 119. | 2.82 | Northwestern Area School District 56-7 / 1,800 |
| 119. | 2.82 | Sanborn Central School District 55-5 / 1,215 |
| 119. | 2.82 | Wolsey-Wessington School District 02-6 / 1,257 |
| 122. | 2.81 | Mobridge-Pollock School District 62-6 / 4,318 |
| 122. | 2.81 | Newell School District 09-2 / 2,206 |
| 122. | 2.81 | Scotland School District 04-3 / 1,870 |
| 122. | 2.81 | Langford School District 45-2 / 1,195 |
| 122. | 2.81 | Spearfish School District 40-2 / 15,452 |
| 127. | 2.80 | Lemmon School District 52-4 / 2,124 |
| 128. | 2.79 | Marion School District 60-3 / 1,573 |
| 128. | 2.79 | Arlington School District 38-1 / 1,915 |
| 128. | 2.79 | Ipswich School District 22-6 / 2,413 |
| 131. | 2.78 | Webster School District 18-4 / 3,038 |
| 131. | 2.78 | Woonsocket School District 55-4 / 1,217 |
| 131. | 2.78 | Wilmot School District 54-7 / 1,540 |
| 131. | 2.78 | Hoven School District 53-2 / 1,127 |
| 131. | 2.78 | South Central School District 26-5 / 857 |
| 136. | 2.76 | Hill City School District 51-2 / 3,196 |
| 137. | 2.75 | Gettysburg School District 53-1 / 1,353 |
| 138. | 2.74 | Edgemont School District 23-1 / 1,100 |
| 138. | 2.74 | Oldham-Ramona School District 39-5 / 875 |
| 138. | 2.74 | Lake Preston School District 38-3 / 1,174 |
| 141. | 2.73 | Tripp-Delmont School District 33-5 / 1,540 |
| 141. | 2.73 | Greater Scott School District 61-5 / 112 |
| 141. | 2.73 | Herreid School District 10-1 / 688 |
| 141. | 2.73 | Hot Springs School District 23-2 / 5,954 |
| 145. | 2.72 | Britton-Hecla School District 45-4 / 3,149 |
| 145. | 2.72 | Oelrichs School District 23-3 / 355 |
| 145. | 2.72 | Elk Mountain School District 16-2 / 261 |
| 148. | 2.71 | Selby School District 62-5 / 1,594 |
| 148. | 2.71 | Clark School District 12-2 / 2,566 |
| 150. | 2.68 | Menno School District 33-2 / 1,536 |
| 151. | 2.67 | Wessington Springs School District 36-2 / 1,884 |
| 152. | 2.66 | Custer School District 16-1 / 7,983 |
| 152. | 2.66 | Lead-Deadwood School District 40-1 / 6,625 |
| 154. | 2.63 | Roslyn School District 18-2 / 735 |
| 155. | 2.62 | Big Stone City School District 25-1 / 734 |
| 156. | 2.53 | Eureka School District 44-1 / 1,305 |
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.
