Summary:
ZIP code 03857, which includes Newmarket, New Hampshire, has one high school serving grades 9–12: Newmarket Junior-Senior High School. The school enrolls 274 students and is part of the Newmarket School District, providing families in the area with a small-school setting and a relatively low student-teacher ratio of 9.8 to 1.
Newmarket Junior-Senior High School is a strong overall performer. It has a four-star rating and ranked 19th out of 89 New Hampshire high schools in 2025–2026, placing it in the 79th percentile statewide. The school’s 94.7% graduation rate was well above the 87.0% state average, and its reported dropout rate was 0%, compared with 2.3% statewide. Academic results were also above state averages in every reported subject. Reading proficiency was 66%, science proficiency was 51%, and mathematics proficiency was 46%. The school’s largest advantages were in science and 11th-grade SAT mathematics, where it exceeded state results by 13 and 16 percentage points, respectively.
For parents, the school’s clearest strengths are graduation, student persistence, reading, science, and SAT mathematics. Reading remains a strong area despite declining from 76% to 66% in one year, so that trend is worth monitoring. Mathematics is the main improvement opportunity: the school was only slightly above the state average on NH SAS mathematics and trailed its district comparison by 7 points, although its SAT mathematics results were notably strong. The school’s ranking has remained consistently favorable, improving from 25th to 16th before settling at 19th. Overall, families can expect a small, above-average high school with strong completion outcomes and generally solid academic performance.
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