Plano's 2007 enrollment for competitive purposes is officially listed as 5240. This is the number used by the UIL when determining what other schools Plano competes against in all UIL-sponsored athletic and academic competitions. This number exceeds the on-site enrollment of Plano Senior High because the official enrollment of each senior high school also includes the enrollment of each of its feeder schools. Ninth and tenth graders who are good enough to compete at the varsity level of a sport may be bused to the senior high school to compete in varsity sports, therefore becoming part of the senior high's talent pool. The number can be fractional because Jasper High School, one of Plano's feeder schools, is also a feeder school for Plano West Senior High School, and therefore the enrollment is split.