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SCHOOL COMMUNITY·KENT SCHOOL DISTRICT·NCES 530396001780

Mattson Middle School

16400 SE 251st ST, Covington, WA 98042 · (253) 373-7670 · King County
GRADES 06–08MIDDLE21-SUBURBTITLE IREGULAR SCHOOL719 STUDENTS
Enrollment
719
Middle
DISTRICT 803 · STATE 577
Student : Teacher
18.4:1
39 FTE teachers
DISTRICT 20.1:1 · STATE 18.9:1
Free / Reduced Lunch
46%
331 students
DISTRICT 55% · STATE 51%
Community
1
0 members
Enrollment and student:teacher ratio compared against other middle schools. Free/Reduced Lunch and demographics compared against all schools.

Enrollment by grade, 2024-25

GradeStudentsShare
Grade 624434%
Grade 724033%
Grade 823533%
Student demographics
75%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 79% · STATE 68% · US 70%
White
26837%
DISTRICT 26% · STATE 47% · US 43%
Hispanic
16523%
DISTRICT 24% · STATE 27% · US 30%
Black
466%
DISTRICT 13% · STATE 5% · US 15%
Asian
13719%
DISTRICT 24% · STATE 9% · US 6%
Two+
8111%
DISTRICT 9% · STATE 9% · US 5%
Native American
91%
DISTRICT 0% · STATE 1% · US 1%
Pacific Islander
112%
DISTRICT 3% · STATE 2% · US 0%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
Male
36751%
Female
35049%

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Test scores

Smarter Balanced + WCAS 2024-25 . % Met or Exceeded Standard
English Language Arts
47.2%
WA avg 58.4% . -8.5pp since 2014
Math
33.3%
WA avg 51.2% . -16.1pp since 2014

What this means: On the Smarter Balanced + WCAS, Washington's statewide test, about 47 of every 100 students at this school read and write at grade level and about 33 of 100 do math at grade level. Across all Washington schools, those numbers are about 58 and 51. Reading and writing scores are down about 8 points since 2014, while math scores are down about 16 points.

Smarter Balanced + WCAS results by year

School yearEnglish Language ArtsMath
2024-2547.2%33.3%
2023-2446.8%33.9%
2022-2348.2%32.3%
2021-2253.2%34.5%
2018-1957.2%49.0%
2017-1857.4%48.6%
2016-1762.4%52.5%
2015-1663.3%51.6%
2014-1555.6%49.3%
% Met or Exceeded Standard, all students and all tested grades.
Source: Smarter Balanced + WCAS. All students, all grades. See all years and grades →

BeatsExpectations

Demographically-adjusted score · methodology
Tier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
38.9%
composite math + reading, all grades
Predicted
49.3%
based on WA schools with similar FRL share
Beats by
-10.4pp
below demographic expectation

What this means: About 39% of students here test proficient in math and reading, compared with the roughly 49% typical for Washington schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among Washington's top nor bottom 10%.

BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →

Schools most like Mattson Middle School

Mattson Middle School's state test result (38.9% proficient) is higher than 1 of the 5 schools below with a result.

SchoolStudentsLow-incomeProficient
Mattson Middle School this school71946.0%38.9%
Olympic View Middle School
Mukilteo
85149.1%48.4%
Meeker Middle School
Tacoma
56743.6%43.2%
Salish Middle School
Lacey
74548.3%35.4%
Eisenhower Middle School
Everett
91455.4%51.4%
Drum Intermediate
UNIVERSITY PLA
63943.0%60.9%
Matched among Washington middle schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.

Where Mattson Middle School ranks

Among middle schools
MeasureThis schoolIn WashingtonIn King County
State test proficiency
ranked highest first
38.9%#160 of 294#50 of 76
Math proficiency
ranked highest first
33.3%#182 of 357
▼ 16
#52 of 76
▼ 1
Reading proficiency
ranked highest first
47.2%#174 of 357
▲ 3
#49 of 76
▼ 1
3-year test score change
ranked biggest drop first
-3.6pp#34 of 290#11 of 75
Enrollment
ranked largest first
719#122 of 377#43 of 80
Students per teacher
ranked fewest first
18.4:1#117 of 340#17 of 76
Diversity index
ranked most diverse first
75.4%#38 of 340#23 of 76
Free and reduced lunch
ranked highest share first
46.0%#218 of 359#32 of 77
Enrollment change since 2017-18
ranked fastest growth first
+14.9%#38 of 130#13 of 33
Ranked against other public middle schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.

4-year change

SY 2020-21 vs SY 2024-25
Enrollment
719
+77 (+12%) vs 2020
-27% since 1990-91, when it was 979
Student : Teacher
18.4:1
was 18.3:1
Source: NCES Common Core of Data

Enrollment and staffing by year

School yearStudentsTeachers (FTE)Students per teacherFree and reduced lunch
2024-257193918.4:146% (331)
2023-2477941.418.8:150% (387)
2022-236173219.3:154% (335)
2020-216423518.3:142% (267)
2017-186263418.4:142% (260)
2015-166212921.4:141% (256)
2010-116473120.9:121% (133)
2000-019514521.1:1N/A
1990-919794621.3:1N/A
Source: NCES Common Core of Data. Rows are the federal collections on file for Mattson Middle School.

Since 2017-18: students up 15% (626 to 719); teachers up 15% (34 to 39).

About Mattson Middle School

Mattson Middle School is a middle school in Covington, Washington, and it is part of Kent School District. Students in grades 6 through 8 attend the school, which enrolls 719 students. The average among middle schools in Washington is roughly 577 students; this school is 25% above that.

The district for Mattson Middle School is Kent School District, with 44 schools and 25,358 students.

Mattson Middle School's enrollment has no majority group, and White students are the largest at 37%. The school is also 23% Hispanic, 19% Asian, 11% multiracial, and 6% Black. The White share of the county population is higher, at 55%. The chance that two students picked at random at Mattson Middle School belong to different racial or ethnic groups, known as the diversity index, is 75%.

Teacher staffing is 39 full-time equivalents, or about 18.4 students per teacher. Across middle schools in Washington, the average ratio is about 18.9:1. Eligibility for subsidized school meals is 46%. For comparison, public schools in King County average 38%.

On a poverty-adjusted basis, Mattson Middle School falls in the middle 80% of Washington schools: 38.9% actual against 49.3% predicted.

Among King County residents, median household income is about $124,746, about 57% of adults have at least a bachelor's degree, and roughly 5% of residents are in poverty. Mattson Middle School is one of 544 public schools in King County, which together enroll about 278,492 students.

The school nearest to Mattson Middle School is Kentwood High School, at a distance of about 0.5 miles. Within five miles of Mattson Middle School, there are at least 8 other public schools. Mattson Middle School is 5th of 9 nearby schools by average proficiency rate.

The federal government classifies Mattson Middle School's location as Suburb: Large.

Between 2020-21 and 2024-25, the student count climbed from 642 to 719.

If you have questions about science fairs, picture day, and bus routes at Mattson Middle School, you can post them here. Anyone with firsthand experience at this school can post or comment.

King County at a glance

View full county profile
Population
2,287,171
Census ACS
Median income
$124,746
Household, ACS
Bachelor's+
57%
Adults 25+
Poverty rate
5%
Below federal line
Schools in county
544
278,492 students

Quick facts

School name
Mattson Middle School
District
Kent School District
Address
16400 SE 251st ST, Covington, WA 98042
Phone
(253) 373-7670
County
King County
Level
Middle
Grade range
06–08
Total enrollment
719
Teachers (FTE)
39
Student–teacher ratio
18.4:1
Free and reduced lunch
331 (46%)
Locale
21-Suburb: Large
NCES ID
530396001780
Charter school
No
Virtual school
No

Related schools

Other schools in Kent School District
Other schools in Covington
Nearby schools

Frequently asked questions

About Mattson Middle School
What is the total enrollment at Mattson Middle School?
Mattson Middle School enrolls approximately 719 students in grades 06-08.
What age range does Mattson Middle School serve?
Mattson Middle School serves students from grade 06 through grade 08.
How many teachers does Mattson Middle School have?
Mattson Middle School employs 39 FTE teachers, for a student-to-teacher ratio of 18.4:1.
How diverse is Mattson Middle School?
Mattson Middle School reports a student body of 37% White, 23% Hispanic, 6% Black, 19% Asian, 11% Two or more.
What district is Mattson Middle School in?
Mattson Middle School is part of Kent School District.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.
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