Best High Schools in Zip Code 83445

ZIP code 83445 (Saint Anthony, Idaho) is served by two high schools in the Fremont County Joint District: South Fremont High School, a traditional grades 9–12 school with 462 students, and Five-County Detention Center, a specialized facility for 18 students in grades 5–12. The only comprehensive high school in the area is South Fremont, and its recent trend is concerning: the school’s state ranking has fallen sharply from the 49th percentile (3 stars) in 2022–2023 to the 12th percentile (1 star) in 2025–2026. Five-County Detention Center, by contrast, is not comparable to a traditional high school—it provides a secure, highly individualized setting with no reported test scores, graduation rates, or ranking data.

South Fremont’s key metrics show a school facing real challenges. Its graduation rate is 82.5%, matching the district and state exactly, meaning about 1 in 5 students does not graduate on time. Chronic absenteeism is 16.5%, higher than both the district (12.2%) and state (13.8%). On the 2025–2026 ISAT assessments, South Fremont trails the state in every subject, with math proficiency especially low at 17.9% compared to 33.1% statewide. Science proficiency is 27.4% (state: 41.2%), and English language arts is 45.2% (state: 61.3%). The school also serves a majority low-income population, with 51.3% of students eligible for free or reduced-price lunch.

The clear takeaway is that South Fremont High School is the primary school to watch in this ZIP code, with declining rankings, low math proficiency, and attendance issues that likely contribute to its academic struggles. Five-County Detention Center should not be used for academic comparison because of its specialized purpose and small size. The district itself ranks only in the 35th percentile statewide, and South Fremont generally performs below the district in math and English language arts, making it a relative weak point within an already mid-low-performing district. Data gaps—such as no 2024–2025 ranking, no current spending figures, and identical graduation rates across school, district, and state—limit a fuller analysis, but the available evidence points to serious areas of concern for the area’s only traditional high school.