Below Average
#2033 of 2,225 schools in WA
Chinook Middle School
Middle School · Highline School District
18650 42nd Ave S, Seatac, WA 98188
Enrollment
603
Student-Teacher
16.3:1
Score
4.2
Grades
6th – 8th
Enrollment
603
Student-Teacher
16.3:1
Score
4.2
Grades
6th – 8th
Updated
2022-23
Updated 2022-23
How this school compares
In Seatac
#6 of 8
public schools
Washington middle schools
#326 of 374
In district
#27 of 34
Highline School District
School environment
8.1 / 10
Very strong
About Chinook Middle School
Chinook Middle School is a regular public middle school located in SeaTac, Washington, serving students from sixth to eighth grade. With an enrollment of 603 students and a student-to-teacher ratio of 16.3:1, the school aims to provide personalized attention despite its size. The school boasts 37 full-time equivalent teachers who work diligently to support their students' educational needs.
Academically, Chinook Middle School currently has room for improvement, with a MySchoolScout rating of 3.1 out of 10 and ranking at the 14th percentile among Washington state schools. In terms of subject proficiency, only about one-third of students are proficient in English Language Arts/Reading (33%), while fewer than one-fifth meet proficiency standards in math (17%) and science (26%). The school is focusing on developing strategies to enhance academic performance and support student growth.
Chinook Middle School is situated in a large suburban area, providing its students with access to various community resources and amenities. Despite the current challenges, the school remains dedicated to fostering an environment where all students can thrive and succeed.
Score Breakdown
Full Profile · 3/3 metricsView breakdown
View breakdown
View breakdown
Chinook Middle School — Students at Chinook Middle School score 20% proficient, which is below what's typical for similar communities (expected: 29%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
76.8%
Students qualifying for federal meal assistance
Test Scores WA SBA (2023-24)
Based on 13 test records from WA state assessments. About our data
Proficiency Trend
↓ DecliningAverage proficiency (% at or above grade level) across Math & ELA over time.
Source: EdFacts (NCES) and state assessment data. Growth score: 2.6/10.
How Chinook Middle School Compares
See how Chinook Middle School performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Performance Trends
Math proficiency has declined from 29% (2019) to 14.2% (2024). Reading/ELA proficiency has declined from 55% (2019) to 26.6% (2024).
Location
18650 42nd Ave S, Seatac, WA 98188
Nearby Alternatives
Families considering Chinook Middle School may also want to explore other middle schools in the area. Showalter Middle School (rated 5.5/10, 2.8 miles away, in nearby Tukwila), which scores notably higher. Additionally, Pacific Middle School (rated 3.3/10, 2.8 miles away, in nearby Des Moines), with a comparable rating. For more schools in Seatac, see our Seatac schools guide .
Nearby Schools
20 within 2.1 mi| School | Distance | Rating |
|---|---|---|
| Tyee High School Seatac | 0.1 mi | 3.7 |
| Bow Lake Elementary Seatac | 0.3 mi | 4.1 |
| SEATTLE CHRISTIAN SCHOOLS Seatac | 0.4 mi | 6.6 |
| Valley View Early Childhood Center Seatac | 0.7 mi | 5.2 |
| McMicken Heights Elementary Seatac | 1.3 mi | 6.0 |
| Madrona Elementary Seatac | 1.2 mi | 6.6 |
| Thorndyke Elementary Tukwila | 2.3 mi | 5.7 |
| River Ridge Elementary Seatac | 2.4 mi | 5.4 |
| Impact Public Schools Tukwila | 2.5 mi | 5.9 |
| Impact | Salish Sea Elementary Tukwila | 2.5 mi | 8.3 |
| Cascade Public Schools Des Moines | 2.5 mi | — |
| Foster Senior High School Tukwila | 2.7 mi | 5.9 |
| Tukwila Elementary Tukwila | 2.5 mi | 6.2 |
| Showalter Middle School Tukwila | 2.8 mi | 5.5 |
| Midway Elementary Des Moines | 2.7 mi | 3.3 |
| ST PHILOMENA SCHOOL Des Moines | 2.6 mi | 6.4 |
| Pacific Middle School Des Moines | 2.8 mi | 3.3 |
| Mount Rainier High School Des Moines | 2.8 mi | 6.0 |
| CHOICE Academy Seattle | 2.1 mi | 6.8 |
| Highline Home School Center Burien | 2.1 mi | — |
Neighborhood Census ACS (2019-2023)
Census data for ZIP 98188 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$76,559
Median Home Value
$452,900
Median Rent
$1,641/mo
Population
26,769
College Educated
26.5%
Homeownership
41.6%
Avg Commute
24.1 min
Poverty Rate
9.2%
Median Age
36.8
Community Profile
The community surrounding Chinook Middle School has a median household income of $76,559. It is an area where 27% of adults hold a bachelor's degree or higher. The median home value in the area is $452,900, with a median rent of $1,641/month. The local poverty rate of 9.2% is relatively low. The average commute for residents is 24 minutes. Source: U.S. Census ACS 2022 5-Year Estimates.
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| Frontier Middle School Moses Lake, WA | 4.2 |
| Lynden Middle School Lynden, WA | 4.2 |
| Mount Baker Middle School Mount Vernon, WA | 4.2 |
| Mountain View Middle School Bremerton, WA | 4.2 |
| Twin Falls Middle School North Bend, WA | 4.2 |
| Cascade Middle School Vancouver, WA | 4.3 |
Frequently Asked Questions
Common questions about Chinook Middle School
What grades does Chinook Middle School serve?
Chinook Middle School serves students in grades 6th through 8th.
How many students attend Chinook Middle School?
Chinook Middle School has an enrollment of approximately 603 students.
What is the student-teacher ratio at Chinook Middle School?
The student-teacher ratio at Chinook Middle School is 16.3:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Chinook Middle School rank in WA?
Chinook Middle School is ranked #2033 out of 2,225 schools in WA.
What is Chinook Middle School's MySchoolScout rating?
Chinook Middle School has a composite rating of 4.2 out of 10 on MySchoolScout. This score combines academic performance, student growth, and school environment into a single score. Equity data is shown separately for context.
What are the test scores at Chinook Middle School?
Based on the most recent state assessment data, Chinook Middle School has 17.1% math proficiency and 32.5% reading/ELA proficiency.
Is Chinook Middle School a charter school?
No, Chinook Middle School is not a charter school. It is a traditional public school operated by the local school district.
Is Chinook Middle School a Title I school?
No, Chinook Middle School is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Chinook Middle School?
76.8% of students at Chinook Middle School qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
Neighborhood Context
- City Safety
- High (4,376/100K)
FBI UCR 2024. City-level (Seatac). Data >1 year old.
Quick Facts NCES CCD (SY 2022-23)
- Grades
- 6th – 8th
- Enrollment
- 603
- Student-Teacher Ratio
- 16.3:1
- Teachers (FTE)
- 37
- Free/Reduced Lunch
- 76.8%
- Type
- regular
- Setting
- Large Suburb
- County
- King County
- Phone
- (206) 631-5700
- Data Year
- 2023–2024
Resources & Links
District
Highline School District- District Enrollment
- 17,823
- Schools in District
- 43
- Per-Pupil Spending
- $20,594
- District Rank
- #27 of 34
How We Rate Schools
Every school receives a composite score from 1 to 10 based on four pillars: Academic Performance (50%), Student Growth (20%), Equity (15%), and Learning Environment (15%). Scores are built from publicly available data including standardized test results, enrollment figures, and school climate indicators.
Read our full methodologyRelated reading
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