For the 2018 Spring League, 36 high school teams are assigned to 5 conferences based on a similar number of team members.
(#) = Number of athlete’s scores used for each team to determine True Team™ scoring points earned.
| CONFERENCE 1 (5) |
| Armour High School |
| Dakota Christian School |
| De Smet High School |
| Kimball High School |
| Leola High School |
| Sisseton High School |
| Wall High School |
| CONFERENCE 2 (11) |
| Aberdeen Christian School |
| Bon Homme High School |
| Garretson High School |
| Gettysburg High School |
| Redfield High School |
| Stanley County High School |
| Warner High School |
| Winner/Colome High School |
| CONFERENCE 3 (15) |
| Aberdeen Roncalli High School |
| Belle Fourche High School |
| Britton-Hecla High School |
| Dakota Valley High School |
| Hot Springs High School |
| Milbank High School |
| Timber Lake High School |
| Wessington Springs High School |
| CONFERENCE 4 (25) |
| Aberdeen Central High School |
| Bowdle High School |
| Brandon Valley High School |
| Chamberlain High School |
| Elk Point/Vermillion High School |
| Groton Area High School |
| Mitchell High School |
| Platte-Geddes High School |
| CONFERENCE 5 (32) |
| Brookings High School |
| Canton High School |
| Harrisburg High School |
| Pierre TF Riggs High School |
| Yankton High School |