Wallingford's Mark T. Sheehan High School is a Public School Serving students in Grades 09-12.
83.53% of students at this school are White, non-Hispanic
| Grades Offered | Grades 09-12 | 
| Total Students | 917 | 
| Student:Teacher ratio | 13:1 | 
| Gender % | 48.20 % Male / 51.80 % Female | 
| Total Classroom Teachers | 70.79 | 
| Student Population at Mark T. Sheehan High School by Grade |  | 
| Magnet School |   | 
| Charter School |   | 
| Shared School |   | 
| Title 1 Eligible |   | 
