Mark T. Sheehan High School

Mark T. Sheehan High School is a public mid-sized high school in Wallingford, Connecticut. Students in grades 9 through 12 make up the school's enrollment of 673 students.

Across its 12 schools, Wallingford School District enrolls 5,087 students. Mark T. Sheehan High School is one of those schools.

The student body at Mark T. Sheehan High School is 65% White. The rest of enrollment is 22% Hispanic, 6% Asian, 4% multiracial, and 2% Black. Among South Central Connecticut Planning Region residents, the White share is about 62%. Its diversity index, the chance that two randomly chosen students belong to different racial or ethnic groups, is 53%.

For every teacher at Mark T. Sheehan High School, there are about 11.1 students; the school has 60.8 full-time-equivalent teachers. Statewide, high schools in Connecticut average 12.3:1. The eligibility rate for free or reduced-price meals is 32%. Across public schools in South Central Connecticut Planning Region, the average is 51%.

In South Central Connecticut Planning Region, median household income comes to about $88,197, a bachelor's degree or higher is held by about 42% of adults, and the poverty rate is about 7%. The county's public schools total 152, with about 72,909 students.

James H. Moran Middle School is about 0.2 miles from Mark T. Sheehan High School, the shortest distance to any other public school. Counting only straight-line distance, at least 8 other public schools are within five miles.

The federal government classifies Mark T. Sheehan High School's location as Suburb: Large.

By 2024-25, enrollment had dropped to 673, from 760 in 2020-21.

This community page is for conversations about athletics, class schedules, and weather closures. You can also rate the school on this page.