For the 2018 Spring Trap League, 26 high school teams are assigned to 4 conferences in 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) |
| Christ Our Savior Lutheran High School |
| Eastland High School |
| Greenfield High School |
| Milledgeville High School |
| Odin High School |
| Scales Mound High School |
| Wethersfield High School |
| CONFERENCE 2 (11) |
| Dieterich High School |
| Polo Community High School |
| Prairie Central High School |
| Prophetstown High School |
| Reed-Custer High School |
| Southwestern High School |
| CONFERENCE 3 (15) |
| Carrollton High School |
| Edwardsville High School |
| Momence High School |
| Newton Community High School |
| St. Anthony High School |
| Teutopolis High School |
| CONFERENCE 4 (19) |
| Altamont High School |
| Brimfield High School |
| Bunker Hill High School |
| Collinsville High School |
| Mount Pulaski High School |
| Parkview Christian Academy |
| Staunton High School |