For the 2018 Spring League, 45 high school teams are assigned to 7 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) |
| Grand Haven High School |
| Lake Fenton High School |
| Midland-Dow High School |
| New Buffalo High School |
| Norway High School |
| Saline High School |
| CONFERENCE 2 (7) |
| Hackett Catholic Prep High School |
| Hemlock High School |
| Marine City High School |
| Pittsford Area High School |
| Reading High School |
| Reese High School |
| CONFERENCE 3 (9) |
| Constantine High School |
| L’Anse Creuse High School North |
| Memphis High School |
| New Haven High School |
| Oxford High School |
| Sandusky High School |
| St. Clair High School |
| CONFERENCE 4 (12) |
| Chippewa Hills High School |
| Eisenhower High School |
| Grosse Ile High School |
| Manchester High School |
| Midland High School |
| Port Huron Northern High School |
| Unionville-Sebewaing Area High School |
| CONFERENCE 5 (15) |
| Bay City Western High School |
| Columbia Central High School |
| Harbor Beach Community High School |
| Hillsdale Academy |
| Lake Shore High School |
| Napoleon High School |
| Reed City High School |
| Unity Christian High School |
| CONFERENCE 6 (22) |
| Anchor Bay High School |
| Dexter High School |
| Fenton High School |
| Olivet High School |
| Portland High School |
| Quincy High School |
| Utica High School |
| CONFERENCE 7 (36) |
| Armada High School |
| Richmond High School |
| Romeo High School |
| Vicksburg High School |