It serves students in grades 9 through 12 and is located in Marion, Iowa.

[4] In 2016, Newsweek named Linn-Mar to its list of best high schools for low-income students.

[5] LMHS athletic teams are nicknamed the Lions and compete in the Mississippi Valley Conference.

[9] Linn-Mar has three competitive show choirs, the mixed-gender "10th Street Edition" and "In Step" as well as the all-female "Hi-Style".

[17][18] In 2023, 10th Street Edition came first in the Show Choir Nationals at the Grand Ole Opry House in Nashville, Tennessee.