IHSAA classifications are based on four-year enrollments (grades 9–12).
The classifications for the state's 156 high schools for 2012–14 are:
| Classification | Enrollment |
Average per class year |
Member schools |
|---|---|---|---|
| 5A | 1280 + | 320 + | 19 |
| 4A | 640–1279 | 160–319 | 24 |
| 3A | 320–639 | 80–159 | 22 |
| 2A | 160–319 | 40–79 | 25 |
| 1A, | 100–159 | 25–39 | 27 |
| 1A, | 0–99 | 0–25 | 39 |
| Total | 156 | ||
Read more about this topic: Idaho High School Activities Association