Summary:
ZIP code 54421 in Colby, Wisconsin, contains exactly one public high school: Colby High, which serves 306 students in grades 9–12 as part of the Colby School District.
Colby High stands out for strong completion outcomes. In 2024–2025, its graduation rate was 100.0%, above Wisconsin’s 92.0%, and its dropout rate was 0.0%, below the state’s 1.1%. Chronic absenteeism was 15.1%, lower than the state’s 17.3% but higher than the district’s 8.9%. On the other hand, academic rankings and test proficiency are low. The district ranks 413 of 432 (4th percentile, 0 stars). Colby High’s school rank was 458 of 533 (14th percentile, 1 star) in 2025–2026, 375 of 431 (13th percentile, 1 star) in 2024–2025, and 407 of 431 (6th percentile, 0 stars) in 2023–2024.
Test scores in 2025–2026 were below state averages in all subjects: Social Studies 30.56% vs 48.25%, English Language Arts 26.39% vs 48.47%, Mathematics 8.33% vs 42.93%, and Science 29.17% vs 43.20%. Mathematics is the largest concern, with a 34.60-point gap and a drop from 27.12% in 2024–2025. ELA fell from 45.76% to 26.39%, a 19.37-point decline. Social Studies improved from 16.88% to 30.56%, though still below state. Science was 33.90% in 2024–2025 and 29.17% in 2025–2026. About 51.63% of students qualified for free/reduced lunch, and per-student spending was $16,148 with a 16.3 student-teacher ratio. Overall, Colby High has excellent completion metrics but weak standardized test performance, especially in math and ELA.
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