Summary:
ZIP code 86404 has two elementary schools, Nautilus Elementary and Havasupai Elementary, both in Lake Havasu Unified District; both serve through grade 6, and Nautilus also offers prekindergarten. Their enrollments and student–teacher ratios are similar, but their reported achievement results are not. The most important finding for families is that the school a child attends makes a substantial difference in the results reported for this area.
Nautilus is the stronger performer in the available comparisons, while Havasupai is lower. In 2025–26 all-grades AASA results, Nautilus had 47% proficiency in ELA and 39% in math, ahead of Havasupai’s 28% and 24% by 19 and 15 percentage points, respectively. Nautilus was 6 points above state results in each subject; Havasupai was 13 points below the state in ELA and 9 points below in math. In grade 5 science, Nautilus led Havasupai by 14 points, with results of 43% and 29%. Grade-level results show variation within schools, too: Nautilus was 14 points above the state in grade 6 ELA and 20 points above in grade 6 math, but its grade 3 and 4 math results were 8 and 7 points below state figures.
SchoolDigger’s statewide percentile ranking fell for both schools in the listed years, with a larger decline at Havasupai: Nautilus went from the 60th percentile in 2023–24 to the 55th in 2025–26, while Havasupai dropped from the 47th to the 25th; their latest ratings are 3 stars and 1 star, respectively. These are ranking changes, not a year-to-year comparison of proficiency scores. The schools have 345 and 324 students and student–teacher ratios of 19.1 and 19, while Havasupai’s reported 2021–22 spending was $7,538 per student, $564 more than Nautilus’s $6,974; these figures do not explain the achievement difference. Some grade-level results, including Havasupai’s grade 5 ELA and grade 3 and 6 math results, are suppressed, so those comparisons cannot be made.
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