Best High Schools in Merrimack, NH

Merrimack, New Hampshire, has one public high school serving grades 9–12: Merrimack High School, a school of about 1,057 students in the suburban Merrimack community and part of the Merrimack School District.

For families, the school’s strongest features are its graduation and student-retention outcomes. Merrimack High School has a 91.8% graduation rate, compared with 87.0% statewide, and a very low 0.7% dropout rate versus 2.3% for New Hampshire. Its 12.4:1 student–teacher ratio is also favorable, although this measure does not necessarily represent actual class sizes. The school’s reading results are a clear academic strength: 66% of students reached proficiency on the latest NH SAS reading assessment, compared with 59% in the district and 55% statewide. On the SAT reading measure, the school matched the district at 66% and exceeded the state’s 62%.

The main concern is mathematics. Only 25% of students were proficient on the latest NH SAS math assessment, compared with 47% in the district and 44% statewide. SAT math performance was somewhat better relative to the district but still below the state, at 25% versus 24% and 30%, respectively. Science proficiency was 38%, matching both the district and state, but it fell nine percentage points from the prior year. The school’s ranking also declined from the 75th percentile in 2023–2024 to the 64th percentile in 2025–2026. Overall, Merrimack High School offers strong graduation prospects and above-average reading performance, while parents should pay particular attention to the school’s efforts to improve mathematics and maintain science achievement.