For many years, Mission High School was the city's only high school. As of 2011, it competed in the 5-A Texas classification was home to some 2,200 students. At its peak, it was home to over 4,000 students before MCISD split the Mission High School attendance zone into two, with the addition of Veterans Memorial High School.
Mission High students were victims of the September 21, 1989 Alton, Texas bus crash; the students' school bus, also carrying students to Mission Junior High, fell into a caliche pit after a collision with a truck, causing 21 deaths.[4]
^"Mission CISD School Zones." Mission Consolidated Independent School District. Retrieved on August 2, 2018. See HTML version. Junior high boundaries are determined by the elementary school zoning, with some optional exceptions, while high school boundaries are described by text.