A transportation system, developed in 1909, consisted of a team and wagon to meet students crossing the river by ferry.

The former St. Marys High School building was built in 1931 across from the current swimming pool on Lasley Street.

In 1966, St. Marys, Rossville, Emmett and Delia combined to become one district, USD 321, Kaw Valley.

[1] St. Marys is a member of the Kansas State High School Activities Association and offers a variety of sports programs.

Extracurricular activities are also offered in the form of performing arts, school publications, and clubs.