Best High Schools in Zip Code 48647

Zip code 48647 is home to just one high school, MioAuSable High School, a small rural school serving grades 6 through 12 with 263 students in the Mio, Michigan area.

For parents considering this area, the most important takeaway is that MioAuSable High School excels at getting students to graduation despite facing notable academic hurdles. The school boasts a 90.6% graduation rate—well above the state’s 84.0%—and a dropout rate of just 3.1%, less than half the state average. This suggests a supportive environment where students stay on track to finish. However, the school’s state ranking has slipped from the 60th percentile in 2023-2024 to the 38th percentile in 2025-2026, reflecting declining relative performance. A major red flag is chronic absenteeism: 37% of students miss significant school days, far exceeding the state’s 27.9% rate. With 55.89% of students qualifying for free or reduced lunch, the school serves a majority low-income population, yet it spends a generous $15,104 per student and maintains a favorable 14.4:1 student-teacher ratio.

Academically, the picture is mixed. The school shows clear strengths in 11th-grade science (39.3% proficient vs. 35.2% statewide) and 9th-grade ELA (65.6% vs. 60.2%), suggesting effective instruction in those areas. But math proficiency is a consistent crisis across every grade level, with 10th-grade math at just 11.4% proficiency compared to the state’s 31.5%. Early-grade literacy is also troubling—6th-grade ELA proficiency sits at a mere 7.89% versus the state’s 37.5%. Interestingly, performance varies wildly by grade, likely due to very small class sizes of roughly 38 students per grade, where a single cohort can dramatically swing results. While the school’s declining ranking and test scores warrant concern, its strong graduation outcomes and low dropout rate indicate that Mio-AuSable Schools successfully keeps students engaged through completion, even if proficiency metrics lag.