It is the sole public high school for the communities of Marion, Florence, Aulne, Canada, Eastshore, Marion County Lake, and nearby rural areas of Marion County High school students from Florence started attending Marion High School in the fall of 1971 after the Florence High School was closed in the same year.

All high school athletic and non-athletic competition is overseen by the Kansas State High School Activities Association.

[10] In 2024, the City of Marion and Unified School District 408 jointly built a gymnasium and indoor swimming pool.

Located just south of Marion Elementary School, the pool is open year-round and the gym features a walking track above a sunken gymnasium floor.

[11] The bond issue that financed the project also built a new auditorium on the Marion High School campus.