Enrollment
645
Washington · 2024-25 NCES data
Middle school (grades 6-8) · Arlington, WA
Post Middle School
Federal NCES profile for Post Middle School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 40/100.
2024-25 NCES dataMiddle school (grades 6-8)NCES 530024000024
👥 S:T ratio 19
🌟 Gifted program 70
🎓 Counselors 36
📋 Attendance 35
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Post Middle School earns 40/100 on the Resource Investment Index, with class sizes larger than 80% of Washington schools.
- #3 of 12
- public schools in Arlington · Resource Index
- 40
- Resource Index · Typical
- 20.2:1
- large classes for Washington
- 33.6%
- free-lunch eligible
Post Middle School has class sizes larger than 80% of Washington schools. Computed live against every Washington school reporting to NCES.
By Resource Investment Index, Post Middle School ranks #3 of 12 public schools in Arlington, WA.
School address
District: Arlington School District · Washington
NCES ID 530024000024 Verify on NCES CCD record →
Teachers (FTE)
32.0
Federal CCD staff survey
Students per teacher
20.2:1
vs 17.6:1 Washington avg
+15% vs state
Free-lunch eligible
33.6%
vs 45.0% Washington avg
-25% vs state
Student-teacher ratio in context
How Post Middle School compares with Washington and U.S. medians
What stands out at Post Middle School
Post Middle School is a mid-sized middle school in Arlington, Washington, enrolling 645 students.
Class loads run somewhat heavier than typical: 20.2:1 puts it in the larger third of Washington schools by student-teacher ratio.
Economic need runs somewhat below the state's typical profile, with 33.6% of students eligible for free meals.
Enrollment of 645 puts it in the larger third of Washington schools by headcount.
Its Resource Investment Index lands in the lower third of 2,394 scored Washington schools.
Against 446 statewide peers matched on enrollment and economic need, it ranks mid-pack at #314.
Its student body is led by White (72%) and Hispanic or Latino (16%) (diversity index 45/100).
Counselor coverage runs a bit thin, about 323 students per counselor, somewhat past the ASCA-recommended 250:1 benchmark.
Chronic absenteeism is elevated: 25.9% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
The federal civil-rights collection also records 54 expulsions at this campus for 2021-22.
Among Arlington's middle schools, it stands alongside Haller Middle School (576 students): Post Middle School is larger than that campus by headcount and runs leaner classes (20.2:1 vs 21.3:1).
Arlington School District also operates Arlington High School (1,650 students) and Eagle Creek Elementary (665 students) alongside Post Middle School.
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Post Middle School compares
Post Middle School on the metrics families compare, against Washington and U.S. means.
| Metric | This school | vs Washington | Washington avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 20.2:1 | ▲ 15% | 17.6:1 | 15.7:1 |
| Free-lunch eligible | 33.6% | ▼ 25% | 45.0% | 51.7% |
| Enrollment | 645 | top 17% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
20.2:1
Leaner classes than 15% of US schools, heavier class loads than most.
645
Bigger than 76% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
33.6%
free-lunch eligible
- 25% below the Washington average of 45.0%
Below the 40% Title I threshold; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
20.2:1
students per teacher
- 15% above state mean
Top 80% in Washington - lower ratio than 20% of state schools
Above 20:1, running heavier than the typical U.S. public school; staffing is comparatively stretched.
Engagement
25.9%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$16,661
per pupil, district-wide
- below Washington avg of $19,487
Close to the U.S. public-school average per-pupil spend.
Support staff
Counselors2.0 FTE
Per 323 students, the combined health-and-guidance staffing load for this school.
Discipline context
24
in-school suspensions + 55 out-of-school
Suspension rate: 3.7 per 100 students. Combined in-school and out-of-school rate: 12.2 per 100 students. Reported via the Civil Rights Data Collection. Includes 54 expulsions.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
White 72.4%
Hispanic or Latino 15.8%
Two or More 7.1%
Asian 1.7%
American Indian / Alaska Native 1.6%
African American 1.1%
Native Hawaiian / Pacific Islander 0.3%
Largest group: White at 72.4% of enrollment.
Student-body diversity index 44.5/100
Simpson diversity index - at 44.5, Post Middle School is less mixed than the Washington school average of 53.3.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Arlington School District, which includes Post Middle School.
$16,661
Per student
-15%
vs Washington
Avg $19,487
+0%
vs U.S.
Avg $16,593
Revenue mix
Local 18.2%
State 68.7%
Federal 13.1%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Post Middle School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Arlington High School | Larger | Similar economic need | Similar S:T ratio |
| Eagle Creek Elementary | Similar size | Similar economic need | Lower S:T ratio |
| Kent Prairie Elementary | Similar size | Similar economic need | Lower S:T ratio |
| Presidents Elementary | Similar size | Similar economic need | Lower S:T ratio |
| Haller Middle School | Similar size | Similar economic need | Similar S:T ratio |
Comparisons are relative to Post Middle School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,650
- Students per teacher
- 20.9:1
- Resource Index
- 44/100
- Enrollment
- 665
- Students per teacher
- 15.8:1
- Resource Index
- 33/100
- Enrollment
- 621
- Students per teacher
- 15.5:1
- Resource Index
- 32/100
- Enrollment
- 578
- Students per teacher
- 16.1:1
- Resource Index
- 33/100
- Enrollment
- 576
- Students per teacher
- 21.3:1
- Resource Index
- 40/100
Similar middle schools in Arlington
1 comparable middle schools (grades 6-8) serving the same city.
Similar middle schools statewide
Matched by enrollment size and by staffing ratio across all of Washington, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~645 students)
Similar student-teacher ratio (~20.2:1)
Next steps
Verify locally before acting on Post Middle School's federal record.
- Compare Post Middle School against another school. Compare schools
- Arlington School District's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Post Middle School
How many students attend Post Middle School?
Post Middle School has 645 students enrolled. It is a middle school in Arlington, WA.
What is the student-teacher ratio at Post Middle School?
The student-teacher ratio at Post Middle School is 20.2:1, which is 15% higher than the Washington average of 17.6:1 and 29% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Post Middle School?
33.6% of students at Post Middle School are eligible for free lunch, compared to the Washington average of 45.0%.
What is the racial and ethnic makeup of Post Middle School?
The largest demographic group at Post Middle School is White at 72.4% of enrollment, in Arlington, WA.
What is the Resource Investment Index for Post Middle School?
Post Middle School has a Resource Investment Index of 40/100 (typical reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Post Middle School rank among public schools in Arlington?
By Resource Investment Index, Post Middle School ranks #3 of 12 public schools in Arlington, WA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Arlington on the city page.
Is Post Middle School a good school?
Post Middle School earns 40/100 on the Resource Investment Index, with class sizes larger than 80% of Washington schools. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in Arlington School District?
Besides Post Middle School, Arlington School District also operates Arlington High School (1,650 students), Eagle Creek Elementary (665 students), and Kent Prairie Elementary (621 students). See the Arlington School District district page for the complete list.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.