Summary:
ZIP code 55604 is home to a single high school, Cook County Senior High, a small rural school in Grand Marais serving grades 9–12 with 177 students and an 11:1 student-teacher ratio.
Cook County Senior High had an exceptional 2025–2026 year. It ranked 21st out of 473 Minnesota schools, placing in the 96th percentile with 5 stars — a dramatic jump from 165th of 450 (63rd percentile, 3 stars) the year before, a 144-position improvement. The school outperformed the state in every tested subject: Math at 47.4% proficient vs. 44.9% state, Reading at 61.5% vs. 48.6%, and Science at 54.3% vs. 25.5% — more than double the state rate. Math showed the biggest turnaround, rising from 17.95% in 2024–2025 (below the state's 45.21%) to 47.4%. Reading and Science dipped from the prior year (75% and 65.12%) but stayed well above state averages, suggesting 2024–2025 was exceptionally strong and 2025–2026 still solid.
Against its district, Cook County Public Schools, the school stands out: all-grade scores were far higher than district averages (Math 47.4 vs. 27; Reading 61.5 vs. 42.4; Science 54.3 vs. 30.6), even though the district ranks 233 of 458 statewide (49th percentile, 2 stars). Its graduation rate of 89.5% beats the state's 84.9%, though its 6.2% dropout rate is above the state's 4.2%. With 177 students, a handful of students can shift percentages year to year, so some volatility is expected. Overall, this is a small rural high school with a very strong recent academic profile.
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