Mark T. Sheehan High School

Mark T. Sheehan High School, a mid-tier senior high in Wallingford, Connecticut, overseen by Wallingford School District, hosts 673 students, covering grades 9 through 12.

Across the 12 schools in Wallingford School District (5,087 students total), Mark T. Sheehan High School accounts for its share of the district's footprint.

On the student-mix side, Mark T. Sheehan High School shows that the largest single group is White, at 65% of enrollment. The remainder is composed of 22% Hispanic, 6% Asian, 4% multiracial, 2% Black. That mix tracks the wider county fairly closely.

Looking at school resources, Staff filings list 61 full-time-equivalent teachers, which works out to roughly 11.1:1 students per teacher. The state averages around 12.3:1, so this campus is tighter than the state norm typical. Roughly 32% of students at Mark T. Sheehan High School qualify for free or reduced-price lunch, which schools and policymakers use as a rough income-mix signal. That share is below South Central Connecticut Planning Region's rate of about 51%.

Zooming out to the county, South Central Connecticut Planning Region reports that median household income runs about $88,197, 42% of adults hold a bachelor's degree or higher, and roughly 7% of residents live below the federal poverty line. In all, South Central Connecticut Planning Region runs 152 public schools (combined enrollment of about 72,909 students), of which Mark T. Sheehan High School is one.

The closest other public school is James H. Moran Middle School, roughly 0.2 miles away. 8 of the 8 nearest public schools sit inside a five-mile radius.

The campus sits in a bedroom-community setting.

Five-year trend. Over the past 7-year window, the student count shrank 13%: 772 students in 2018 compared to 673 in 2025. The White share of enrollment fell from 78% to 65% over that span.

Inside the community feed, the page collects discussion, questions, and updates around classroom updates, athletics, and weather closures. Members of the school community can share what they know.