Summary:
ZIP code 55388 is home to a single high school — Watertown Mayer High in Watertown, MN — which serves grades 9–12 with 516 students as part of the Watertown-Mayer Public School District. Because there is only one school, there is no cross-school comparison to make; instead, the school is best judged against district and state figures.
Academically, the school's strongest showing is at the grade levels that are actually tested in high school. In 2025–2026, 10th grade Reading proficiency was 53.3%, well above the state's 42.5%, and End of Course Science was 38.8% versus 35.0% statewide. Math was much closer at 36.4% for 11th grade, just 1.1 points above the state's 35.3%. Parents should note an important wrinkle: the school's "All Grades" math figure of 36.4% sits below the state's All Grades number of 44.9%, but that state figure includes elementary and middle school grades, so it is not an apples-to-apples comparison for a 9–12 building. Year over year, reading improved from 50.39% to 53.3% and math edged up slightly, while science slipped from 42.27% to 38.8%.
Graduation and dropout outcomes are among the strongest data points: a 90.4% graduation rate against Minnesota's 84.9%, and a 2.3% dropout rate against the state's 4.2%. The district itself ranks 44 of 458 in Minnesota with 5 stars, while the high school ranks 109 of 473 with 4 stars — a solid but not top-tier position. One caution for families is rank volatility: the school moved from 4 stars in 2023–2024 to 3 stars in 2024–2025 and back to 4 stars in 2025–2026, with its percentile going 86 → 61 → 77, so it has not yet returned to its earlier level. With 22.48% of students eligible for free/reduced-price lunch and a student-teacher ratio of 19.1, this is a moderately sized high school with moderate poverty levels.
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