Summary:
ZIP code 98290 in Snohomish, Washington has exactly one middle school: Centennial Middle School, which serves grades 7–8, enrolls 734 students, and belongs to Snohomish School District. Because it is the only middle school option in the ZIP, the most useful comparison is the school's own progress over time and how it stacks up against its district and the state.
The clearest bright spot is the school's upward trajectory. Centennial ranked 276th of 535 schools in 2023–2024 (48th percentile, 2 stars) and 273rd of 534 in 2024–2025 (49th percentile, 2 stars), then jumped to 210th of 514 in 2025–2026 — the 59th percentile with 3 stars. That is a 10-point percentile gain and a 63-position rank improvement in a single year, and it is the strongest positive signal in the data. Even so, the school still trails its own district, which is highly ranked at 40th of 238, the 83rd percentile, and 4 stars, so there is room to close the internal gap.
On 2025–2026 tests, Centennial trailed the district in every subject and grade level by 9 to 13 percentage points. All-grade proficiency was 50.88% in ELA (district 62.38%, state 52.81%), 40.49% in math (district 52.80%, state 43.11%), and 46.52% in science (district 59.88%, state 50.95%). Against the state, results are mixed: the school is slightly below state at the all-grade level, but 8th graders beat state averages in ELA (+0.68 points) and math (+2.27 points), while 7th-grade ELA and math fall below state. Science is the weakest relative subject, and although it improved by 5.81 points, the district improved slightly more. The school did gain in all three subjects year over year — ELA +4.72 points, math +0.64 points, science +5.81 points — while the district declined in ELA and math. Context: 28.2% of students receive free or reduced-price lunch, per-student spending is $18,168, and the student-teacher ratio is 21.4.
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