Marathon Independent School District is a school district based in Marathon, a census-designated place in Brewster County, Texas, United States. Marathon ISD serves Marathon and a few surrounding areas of northeastern Brewster County. The district has one K-12 school, with two buildings: a secondary school building and an elementary school building. It is classified as a 1A school by the UIL. Typically due to its isolation, Marathon generally has the lowest high school enrollment in the state. Marathon's secondary division serves grades 7-12. For the 2021-2022 school year, the school was given an "A" by the Texas Education Agency.

History

As of 2007, the Texas State Energy Conservation Office awards Marathon ISD money due to the colonias served by the district. In 2009, the school district was rated "recognized" by the Texas Education Agency.

Athletics

The Marathon Mustangs compete in the following sports -

State titles

(Both teams were undefeated).

State Finalist

Marathon was also undefeated in 1969 and 1970.