Summary:
High schools located in zip code 83323 consist of just one school: Declo Senior High School, which serves grades 9–12 in Declo, Idaho. This small high school enrolls 326 students with a student-teacher ratio of 19.4, and it operates as part of the Cassia County Joint District (a 2-star district ranked 64th of 101). About 35 percent of students qualify for free or reduced-price lunch, indicating moderate economic need, but the school is not majority high-poverty.
Academically, Declo shows a clear split: English Language Arts is a standout strength, with 76.5 percent proficiency on the most recent End of Course ISAT, far surpassing the district (48.4%) and state (61.3%). However, math proficiency sits at just 23.5 percent — below both the district (24.2%) and state (33.1%) — while science (35.3%) beats the district (26.8%) but trails the state (41.2%). Attendance is exceptional: chronic absenteeism is only 3.1 percent, roughly one-fourth the state rate of 13.8 percent. The school's overall state ranking has been volatile, dropping from the 87th percentile (4 stars) in 2023–2024 to the 33rd percentile (2 stars) in 2024–2025, then partially rebounding to the 47th percentile (2 stars) in 2025–2026 — a swing likely affected by the small number of test-takers.
The reported graduation rate of 82.5 percent is identical for the school, district, and state, which is likely a data artifact and should be treated cautiously. The available per-student spending figure of $8,583 dates to 2018–2019 and is too outdated for current comparisons. For parents, the takeaway is that Declo Senior High School provides a positive, well-attended learning environment with strong literacy outcomes, but math achievement and ranking stability are areas that warrant attention and monitoring.
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