Summary:
Zip code 53129 covers Greendale, Wisconsin, and contains exactly one public high school: Greendale High, a grades 9–12 campus at 6801 Southway serving 882 students within the Greendale School District. Because it is the district's only comprehensive high school, every district figure in the data is identical to the school figure, so the meaningful comparisons below are against statewide results rather than against other local schools.
Academically, the school performs well above the Wisconsin average. In 2025-26, 65.82% of tested students were proficient in Social Studies, 60.66% in English Language Arts, 60.19% in Mathematics and 55.45% in Science, against state rates ranging from about 43% to 48% — a four-subject average of 60.53% versus 45.71% statewide. It ranked 57th of 533 Wisconsin high schools (89th percentile, 4 stars) that year, after placing 40th (91st percentile, 5 stars) the year before. Completion outcomes are exceptional: a 99.5% graduation rate and 0.4% dropout rate, compared with 92.0% and 1.1% statewide, meaning virtually every senior graduates. These results are achieved even though 28.23% of students qualify for free or reduced lunch, a moderate poverty level that typically predicts weaker outcomes.
Parents should watch two trends. First, proficiency declined in all four subjects from 2024-25 to 2025-26 — most sharply in Science (down 5.48 points) and English Language Arts (down 2.60) — while state averages held steady, narrowing the school's edge over the state from about 17 points to about 15. Second, chronic absenteeism stands at 13.2%, better than the state's 17.3% but nearly double the district's 7.4%, affecting roughly 116 students. With 882 students, each grade holds about 220 students, so small shifts can move scores noticeably and single-year changes should be read with caution. Class size (15:1) and per-student spending ($14,831) are solid but unremarkable.
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