Summary:
The Portsmouth School District has one high school, Portsmouth High School, serving grades 9–12 in Portsmouth, New Hampshire. The school enrolls about 1,017 students and is part of a highly rated district ranked 9th out of 166 statewide. Because it is the district’s only high school, there is no comparison among multiple high schools in the area; the available data instead show a consistently strong school with a five-star rating and rankings near the top of its comparison group.
Portsmouth High School’s strongest results are in reading, science, graduation, and student persistence. The graduation rate is 95.5%, compared with 87.0% statewide, while the dropout rate is just 0.8%, compared with 2.3% statewide. On the 2025–2026 NH SAS, 82% of students were proficient in reading and 61% in science, exceeding state results by 27 and 23 percentage points, respectively. The school also performed well on the 11th-grade SAT, with 82% proficiency in reading and 51% in mathematics, compared with 62% and 30% statewide. These results indicate a school where most students successfully remain enrolled, graduate, and perform above state averages.
Mathematics is the main area to watch. Portsmouth High School’s 51% NH SAS mathematics proficiency was 7 points above the state average but 16 points below the district’s reported 67%. Mathematics performance also slipped slightly from 52% to 51% year over year, while reading improved from 80% to 82% and science remained steady at 61%. The school’s reported student-teacher ratio is 11.4:1, and 11.01% of students are reported as eligible for free or reduced-price lunch. Overall, the data present Portsmouth High School as a strong, stable option with especially impressive reading, science, graduation, and dropout outcomes, while mathematics represents the clearest opportunity for improvement.
Thank you for your feedback!