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Chinook Middle School

18650 42nd Ave S, SeaTac, WA 98188

DSchola Grade
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Grades
6–8
Middle
Students
620
Enrolled 2024–25
Students per teacher
17.4 : 1
Full-time teachers
District
Highline School District
King County

Schola Grade D · Below average

Letter grade (A–F) · compared with 368 Washington middle schools · How we grade
Test scores25% proficient in math & reading
15thpercentile
Equity19% of low-income students proficient
12thpercentile
Attendance44% chronically absent
22ndpercentile
Class size17.4 students per teacher
78thpercentile

Percentiles compare this school with other Washington middle schools; the line marks the middle. Data: test scores 2021–22, graduation and absenteeism 2022–23 (U.S. Department of Education, EDFacts); coursework 2023–24 (Civil Rights Data Collection); staffing 2024–25 (NCES).

About Chinook Middle School

Chinook Middle School is a public middle school in SeaTac, Washington, serving grades 6–8. It is part of Highline School District. The school is located in a large suburb in King County.

In the 2024–25 school year, 620 students were enrolled, with about 17.4 students for every full-time teacher. That ratio is smaller than the typical Washington middle school (19.1 students per teacher). Its Schola Grade is D (below average), compared with 368 Washington middle schools.

Grades & enrollment

Students per grade, 2024–25Grades 6–8

Location & nearby schools

18650 42nd Ave S
SeaTac, WA 98188
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School details

Type
Public School · What this means
Level
Middle
Grades offered
6–8
Enrollment (2024–25)
620 students
Students per teacher
17.4 to 1
Charter school
No
Magnet school
No
Locale
Suburb — Large
School district
Highline School District
County
King County
NCES school ID
530354000524

Schools near Chinook Middle School

All 10 schools in SeaTac →

School data comes from the U.S. Department of Education: the National Center for Education Statistics (NCES) Common Core of Data and EDGE school locations (2024–25) and Private School Survey (2023–24), the Civil Rights Data Collection (2023–24), and EDFacts (test results 2021–22; graduation and chronic absenteeism 2022–23), plus other public sources. Please contact the school to confirm enrollment, programs, and other details. How we source data.