Enrollment
364
Washington · 2024-25 NCES data
Elementary school (grades K-5) · Mercer Island, WA
Island Park Elementary
Federal NCES profile for Island Park Elementary, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 65/100.
2024-25 NCES dataElementary school (grades K-5)NCES 530498000758
👥 S:T ratio 37
🌟 Gifted program 70
📋 Attendance 89
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Island Park Elementary earns 65/100 on the Resource Investment Index, with class sizes near the Washington median.
- #1 of 3
- elementary schools in Mercer Island · Resource Index
- 65
- Resource Index · Higher
- 15.8:1
- students per teacher
- 1.3%
- free-lunch eligible
Island Park Elementary has class sizes near the Washington median. Computed live against every Washington school reporting to NCES.
By Resource Investment Index, Island Park Elementary ranks #1 of 3 elementary schools in Mercer Island, WA.
School address
District: Mercer Island School District · Washington
NCES ID 530498000758 Verify on NCES CCD record →
Teachers (FTE)
23.0
Federal CCD staff survey
Students per teacher
15.8:1
vs 17.6:1 Washington avg
-10% vs state
Free-lunch eligible
1.3%
vs 45.0% Washington avg
-97% vs state
Student-teacher ratio in context
How Island Park Elementary compares with Washington and U.S. medians
What stands out at Island Park Elementary
Island Park Elementary is a lower-poverty, mid-sized elementary school in Mercer Island, Washington, enrolling 364 students.
At 15.8:1, its student-teacher ratio sits close to the Washington median, within a few percentage points of the 17.6:1 state norm, neither notably crowded nor notably small.
Comparatively few students face economic hardship here, 1.3% free-meal eligibility runs 97% below the Washington average.
With 364 students, its enrollment sits close to the Washington median campus size.
Its Resource Investment Index outscores 96% of the 2,394 Washington schools with a score on record, a top-tier result on this measure.
Among 112 similarly sized, similarly resourced-need Washington schools statewide, it ranks #11, a top-tier result once campus size and economic need are matched.
Its student body is led by White (56%) and Asian (20%) (diversity index 61/100).
Attendance holds up well here: only 4.4% of students were chronically absent, below the typical post-pandemic national figure.
Among Mercer Island's elementary schools, it stands alongside West Mercer Elementary (431 students): Island Park Elementary is smaller than that campus by headcount and runs leaner classes (15.8:1 vs 18.7:1).
Mercer Island School District also operates Mercer Island High School (1,439 students) and Islander Middle School (960 students) alongside Island Park Elementary.
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 Island Park Elementary compares
Island Park Elementary on the metrics families compare, against Washington and U.S. means.
| Metric | This school | vs Washington | Washington avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 15.8:1 | ▼ 10% | 17.6:1 | 15.7:1 |
| Free-lunch eligible | 1.3% | ▼ 97% | 45.0% | 51.7% |
| Enrollment | 364 | top 54% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
15.8:1
Leaner classes than 40% of US schools, a middle-of-the-pack class size.
364
Bigger than 42% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
1.3%
free-lunch eligible
- 97% below the Washington average of 45.0%
Below the 40% Title I threshold, among the lower-need profiles in the state; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
15.8:1
students per teacher
- 10% below state mean
Top 44% in Washington - lower ratio than 56% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
4.4%
chronically absent (missed 10%+ of school days)
Below 5%, comfortably under the pre-pandemic national baseline for chronic absenteeism.
Funding equity
$17,431
per pupil, district-wide
- below Washington avg of $19,487
Somewhat above the U.S. public-school average, reflecting higher local or state investment per enrolled student.
Support staff
Counselors0.0 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
0
in-school suspensions + 3 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 0.8 per 100 students. Reported via the Civil Rights Data Collection.
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 55.9%
Asian 20.1%
Two or More 16.8%
Hispanic or Latino 6.9%
African American 0.3%
Largest group: White at 55.9% of enrollment.
Student-body diversity index 61.4/100
Simpson diversity index - at 61.4, Island Park Elementary is more mixed than the Washington school average of 53.3.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Mercer Island School District, which includes Island Park Elementary.
$17,431
Per student
-11%
vs Washington
Avg $19,487
+5%
vs U.S.
Avg $16,593
Revenue mix
Local 37.6%
State 56.3%
Federal 6.2%
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 Island Park Elementary Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Mercer Island High School | Larger | Similar economic need | Higher S:T ratio |
| Islander Middle School | Larger | Similar economic need | Higher S:T ratio |
| West Mercer Elementary | Similar size | Similar economic need | Higher S:T ratio |
| Lakeridge Elementary School | Similar size | Similar economic need | Higher S:T ratio |
| Northwood Elementary School | Similar size | Similar economic need | Similar S:T ratio |
Comparisons are relative to Island Park Elementary's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,439
- Students per teacher
- 19.4:1
- Resource Index
- 52/100
- Enrollment
- 960
- Students per teacher
- 20.9:1
- Resource Index
- 51/100
- Enrollment
- 431
- Students per teacher
- 18.7:1
- Resource Index
- 62/100
- Enrollment
- 401
- Students per teacher
- 19.1:1
- Resource Index
- 62/100
- Enrollment
- 398
- Students per teacher
- 15.3:1
- Resource Index
- 66/100
Similar elementary schools in Mercer Island
2 comparable elementary schools (grades K-5) serving the same city.
Similar elementary 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 (~364 students)
Similar student-teacher ratio (~15.8:1)
Next steps
Verify locally before acting on Island Park Elementary's federal record.
- Compare Island Park Elementary against another school. Compare schools
- Mercer Island 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 Island Park Elementary
How many students attend Island Park Elementary?
Island Park Elementary has 364 students enrolled. It is an elementary school in Mercer Island, WA.
What is the student-teacher ratio at Island Park Elementary?
The student-teacher ratio at Island Park Elementary is 15.8:1, which is 10% lower than the Washington average of 17.6:1 and 1% higher than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What percentage of students receive free lunch at Island Park Elementary?
1.3% of students at Island Park Elementary are eligible for free lunch, compared to the Washington average of 45.0%.
What is the racial and ethnic makeup of Island Park Elementary?
The largest demographic group at Island Park Elementary is White at 55.9% of enrollment, in Mercer Island, WA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 61.4/100.
What is the Resource Investment Index for Island Park Elementary?
Island Park Elementary has a Resource Investment Index of 65/100 (higher reported resources relative to schools nationally) based on 3 factors: student-teacher ratio, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Island Park Elementary rank among elementary schools in Mercer Island?
By Resource Investment Index, Island Park Elementary ranks #1 of 3 elementary schools in Mercer Island, WA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all elementary schools in Mercer Island on the city page.
Is Island Park Elementary a good school?
Island Park Elementary earns 65/100 on the Resource Investment Index, with class sizes near the Washington median. 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 Mercer Island School District?
Besides Island Park Elementary, Mercer Island School District also operates Mercer Island High School (1,439 students), Islander Middle School (960 students), and West Mercer Elementary (431 students). See the Mercer Island 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.