Summary:
Zip code 83406 is served by a single high school, Hillcrest High School, which is part of the Bonneville Joint District and serves grades 9 through 12 in Ammon, Idaho, with an enrollment of roughly 1,230 students. Because only one high school exists in this zip code, Hillcrest's performance defines the area's educational profile, and the analysis below focuses on how it compares to its district and state benchmarks.
Hillcrest High School showed a remarkable rebound in its most recent state ranking, climbing to 52nd out of 122 Idaho high schools (57th percentile, 3 stars) in the 2025–2026 school year — a major jump from 97th out of 112 (13th percentile, 1 star) the prior year. On the 2025–2026 End-of-Course ISAT, 69.8% of students were proficient in English Language Arts, well above both the district (51.1%) and state (61.3%). Science proficiency reached 44.7%, also topping the state's 41.2% and far exceeding the district's 28.1%. Math remained the relative weak spot at 32.2% proficiency, slightly below the state average of 33.1% but significantly above the district's 20.6%, suggesting the math gap is a district-wide challenge rather than specific to Hillcrest.
One of Hillcrest's most trustworthy strengths is attendance: only 9.1% of students were chronically absent, compared to 13.4% for the district and 13.8% for the state. The 2024–2025 graduation rate was 82.5%, matching both the district and state figures exactly. About 25.5% of students qualify for free or reduced lunch, indicating moderate economic need. With a student-teacher ratio of 24.2 and per-student spending of $7,531 (2018–2019 data), Hillcrest serves as the primary educational hub for the zip code. That said, the school's test-score story has been volatile: prior-year All Grades ISAT scores were dramatically lower than the most recent End-of-Course results, so families should interpret year-to-year comparisons with some caution.
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