Summary:
ZIP code 53223 is home to two public high schools, both serving grades 6 through 12: Brown Deer Middle/High, with 904 students in the Brown Deer School District, and Green Tree Preparatory Academy, with 535 students in the Milwaukee School District. Because these schools span middle and high school grades, their results mix 6th–8th grade Forward Exam scores with 10th grade Forward Exam and ACT results. The two sit close in spending ($16,997 vs. $17,296 per pupil) but differ sharply in staffing (student–teacher ratios of 12.6 vs. 22.3) and in outcomes.
Brown Deer Middle/High is the stronger performer on nearly every measure. Its 94.4% graduation rate tops the state's 92.0%, and its 0.5% dropout rate is less than half the state's 1.1%. Three of its 12 tested measures reached or beat the state average in 2025-2026, all at 8th grade: Math (66.4 vs. 53.67), ELA (54.84 vs. 54.38), and Social Studies (64.46 vs. 64.63). Its 8th grade Math jumped 14.88 points and Social Studies 20.19 points year over year. Weaker spots remain 6th and 7th grade (Math 6 at 28.57) and ACT Math (22.22 vs. the state's 42.93). Its district quality rank has climbed from the 9th to the 25th percentile.
Green Tree Preparatory Academy faces the deepest challenges: none of its 12 tested measures reached the state average, and its chronic absenteeism of 80.9% is nearly five times the state's 17.3% — versus 36.5% at Brown Deer, meaning attendance is the shared weakness across this ZIP. Still, Green Tree beats its own district on completion: an 85.7% graduation rate against the district's 71.5%, and a 2.1% dropout rate roughly half the district's 4.0%. It has also moved off the bottom, from 431 of 431 schools (0th percentile) in 2023-2024 to 510 of 533 (4th percentile) in 2025-2026, though no 2024-2025 rank is reported.
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