[20][21] The fall 1966 enrollment saw the school reach its capacity, a few months after the first expansion plans were revealed, calling for a swimming pool and more room for art and industrial education, among other additions.

Stagg has made Adequate Yearly Progress on the Prairie State Achievement Examination, the test used in Illinois to fulfill the federal No Child Left Behind Act.

[22] The school sponsors over 70 clubs and activities for students, ranging from athletic and fine arts to leadership and special interest.

The school sponsors interscholastic sports teams for young men and women in basketball, bowling, cross country, golf, gymnastics, soccer, swimming & diving, tennis, track & field, volleyball, and water polo.

[25] The following teams have placed in the top four of their respective IHSA sponsored state championship tournament or meet:[24] Feeder districts include:[6]