Summary:
ZIP code 98108 has one listed middle school, Mercer International Middle School, serving grades 6–8 in Seattle’s South Seattle area. The school enrolls 753 students and is part of Seattle School District No. 1, a four-star district ranked 45th out of 238 Washington districts. Since there is only one middle school in the ZIP code, the most useful information comes from Mercer’s performance by subject and grade, its comparison with the district and state, and its improvement over time.
Mercer is performing well compared with Washington overall and has shown strong recent progress. In 2025–2026, proficiency was 64.99% in English language arts, 56.55% in math, and 58.37% in science—above state averages by 12.18, 13.44, and 7.42 percentage points, respectively. The school improved in every subject from the prior year, with the largest gains in science and math. Its SchoolDigger ranking also improved from the 70th percentile in 2023–2024 to the 84th percentile in 2025–2026. English language arts was the strongest overall subject, while sixth-grade math was a particular bright spot at 64.18%, exceeding both district and state results.
The main consideration is that Mercer trails district averages in all three overall subjects: by 3.14 points in English language arts, 3.69 points in math, and 6.64 points in science. Math performance declines across the middle-school years, from 64.18% in sixth grade to 54.15% in seventh grade and 50.78% in eighth grade. Eighth grade is also Mercer’s weakest ELA year and shows a sizable science gap compared with the district. The school serves a substantial student population eligible for free or reduced-price lunch, with 59.76% qualifying, and has a 17.4-to-1 student-teacher ratio. Overall, Mercer appears to be a strong and improving statewide performer, with the clearest opportunities in later-grade math, eighth-grade outcomes, and matching the broader district’s performance.
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