Enrollment
328
Elementary
DISTRICT 484 · STATE 443
SCHOOL COMMUNITY·YONKERS CITY SCHOOL DISTRICT·NCES 363192004264
SCHOOL 21
100 LEE AVE, YONKERS, NY 10705 · (914) 376-8435 · Westchester County
GRADES PK–06ELEMENTARY21-SUBURBTITLE IREGULAR SCHOOL328 STUDENTS
C
allk12 Grade
Scored higher than 29% of New York public elementary schools
- CTest scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
- CBeats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
- ·Three-year trend Not available for this school, so the grade uses the other parts.
Grades compare a school only with schools in the same state, because every state gives its own test. How grades work · Top-graded New York public elementary schools
Student : Teacher
15.5:1
21 FTE teachers
DISTRICT 18.0:1 · STATE 12.8:1
Free / Reduced Lunch
66%
217 students
DISTRICT 69% · STATE 58%
Community
0
0 members
Enrollment and student:teacher ratio compared against other elementary schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Pre-K | 32 | 10% |
| Kindergarten | 46 | 14% |
| Grade 1 | 42 | 13% |
| Grade 2 | 44 | 13% |
| Grade 3 | 49 | 15% |
| Grade 4 | 35 | 11% |
| Grade 5 | 34 | 10% |
| Grade 6 | 46 | 14% |
This year's kindergarten class (46) is about the same size as its 6th grade class (46).
Student demographics
58%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 55% · STATE 72% · US 70%
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
Test scores
NYS Assessments 2024-25 . % Proficient (Level 3 + Level 4)English Language Arts
41.0%
NY avg 58.3% . +2.0pp since 2023
Math
41.0%
NY avg 57.4% . -5.0pp since 2023
What this means: On the NYS Assessments, New York's statewide test, about 41 of every 100 students at this school read and write at grade level and about 41 of 100 do math at grade level. Across all New York schools, those numbers are about 58 and 57. Reading and writing scores are up about 2 points since 2023, while math scores are down about 5 points.
NYS Assessments results by year
| School year | English Language Arts | Math |
|---|---|---|
| 2024-25 | 41.0% | 41.0% |
| 2023-24 | 39.0% | 46.0% |
% Proficient (Level 3 + Level 4), all students and all tested grades.
Source: NYS Assessments. All students, all grades. See all years and grades →
BeatsExpectations
Demographically-adjusted score · methodologyTier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
39.3%
composite math + reading, all grades
Predicted
50.7%
based on NY schools with similar FRL share
Beats by
-11.4pp
below demographic expectation
What this means: About 39% of students here test proficient in math and reading, compared with the roughly 51% typical for New York 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 New York'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 SCHOOL 21
SCHOOL 21's state test result (39.3% proficient) is higher than 2 of the 5 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| SCHOOL 21 this school | 328 | 66.2% | 39.3% |
| AMPARK NEIGHBORHOOD BRONX | 305 | 65.9% | 65.0% |
| MONTESSORI SCHOOL 31 YONKERS | 351 | 60.4% | 40.3% |
| PAIDEIA SCHOOL 24 YONKERS | 281 | 62.6% | 44.3% |
| CONNOLLY SCHOOL GLEN COVE | 329 | 63.5% | 35.4% |
| SCHOOL 17 YONKERS | 282 | 68.4% | 38.2% |
Matched among New York elementary 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 SCHOOL 21 ranks
Among elementary schools| Measure | This school | In New York | In Westchester County |
|---|---|---|---|
| State test proficiency ranked highest first | 39.3% | #1,655 of 2,335 | #93 of 120 |
| Math proficiency ranked highest first | 41.0% | #1,834 of 2,342 ▼ 355 | #108 of 127 ▼ 16 |
| Reading proficiency ranked highest first | 41.0% | #1,769 of 2,343 ▼ 404 | #102 of 127 ▼ 11 |
| Enrollment ranked largest first | 328 | #1,818 of 2,585 | #116 of 146 |
| Students per teacher ranked fewest first | 15.5:1 | #2,106 of 2,338 | #114 of 141 |
| Diversity index ranked most diverse first | 58.0% | #805 of 2,388 | #43 of 141 |
| Free and reduced lunch ranked highest share first | 66.2% | #1,051 of 2,534 | #27 of 137 |
| Enrollment change since 2017-18 ranked steepest decline first | -28.7% | #319 of 1,757 | #7 of 100 |
Ranked against other public elementary 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 2024-25Enrollment
328
-94 (-22%) vs 2020
-22% since 1990-91, when it was 418
Student : Teacher
15.5:1
was 21.1:1
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 328 | 21.1 | 15.5:1 | 66% (217) |
| 2023-24 | 306 | 21.6 | 14.2:1 | 57% (173) |
| 2022-23 | 356 | 21.5 | 16.6:1 | 64% (229) |
| 2020-21 | 422 | 20 | 21.1:1 | 73% (308) |
| 2017-18 | 460 | 23 | 20.0:1 | 63% (289) |
| 2015-16 | 495 | 21 | 23.6:1 | 73% (362) |
| 2010-11 | 483 | 28 | 17.3:1 | 67% (322) |
| 2000-01 | 446 | 33 | 13.5:1 | 80% (355) |
| 1990-91 | 418 | 21 | 19.9:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for SCHOOL 21.
About SCHOOL 21
Located in YONKERS, New York, SCHOOL 21 is a low-enrollment elementary school. Enrollment is 328 students in 2024-25, and the school serves pre-K through 6. The average for elementary schools in New York is about 443 students, so this school is 26% smaller than average.
YONKERS CITY SCHOOL DISTRICT has 42 schools and 24,376 students, and SCHOOL 21 is one of those schools.
Hispanic students are the majority at SCHOOL 21, with 61% of enrollment. The school is also 18% White, 10% Black, 8% Asian, and 2% multiracial. The Hispanic share of the county population is lower, at 27%. The school's diversity index is 58%, meaning two students picked at random have a 58% chance of belonging to different racial or ethnic groups.
Staffing totals 21.1 full-time-equivalent teachers, and the student-to-teacher ratio is 15.5:1. That is higher than the 12.8:1 average for elementary schools in New York. A measure often used for student poverty, free or reduced-price lunch eligibility, stands at 66%. The gap from the 38% average for public schools in Westchester County is 28 points.
SCHOOL 21 is graded C by allk12, scoring above 29% of New York public elementary schools once test results, poverty-adjusted performance, and the recent trend are combined.
Compared with New York schools that have similar shares of low-income students, SCHOOL 21's results are 11.4 points below predicted: 39.3% against 50.7%.
In Westchester County (population about 999,677), the median household income is $118,976, a bachelor's degree or higher is held by about 53% of adults, and the poverty rate is about 6%. There are 255 public schools in Westchester County, enrolling about 140,968 students in all.
Of nearby public schools, LAS HERMANAS MIRABAL COMMUNITY SCHOOL is the closest, at about 0.6 miles. In all, at least 8 other public schools sit within five miles of SCHOOL 21. Its average proficiency rate of 39.3% is below the 51.8% average for nearby schools.
The school's federal locale classification is Suburb: Large.
Enrollment declined 22% from its 2020-21 level of 422. The student-to-teacher ratio went down from 21.1:1 to 15.5:1.
The discussion area below is open to posts about sports tryouts, band and choir, and theater. Questions from prospective families are welcome too.
Westchester County at a glance
View full county profilePopulation
999,677
Census ACS
Median income
$118,976
Household, ACS
Bachelor's+
53%
Adults 25+
Poverty rate
6%
Below federal line
Schools in county
255
140,968 students
Quick facts
Related schools
Other schools in YONKERS CITY SCHOOL DISTRICT
- YONKERS MONTESSORI ACADEMYCombined · 1,234 students
- LINCOLN HIGH SCHOOLHigh · 1,176 students
- YONKERS HIGH SCHOOLHigh · 1,111 students
- ROOSEVELT HIGH SCHOOL - EARLY COLLEGE STUDIESHigh · 1,096 students
- GORTON HIGH SCHOOLHigh · 1,068 students
- SAUNDERS TRADES & TECHNICAL HIGH SCHOOLHigh · 1,039 students
Other schools in YONKERS
- YONKERS MONTESSORI ACADEMYCombined · 1,234 students
- LINCOLN HIGH SCHOOLHigh · 1,176 students
- CHARTER SCHOOL OF EDUCATIONAL EXCELLENCECombined · 1,127 students
- YONKERS HIGH SCHOOLHigh · 1,111 students
- ROOSEVELT HIGH SCHOOL - EARLY COLLEGE STUDIESHigh · 1,096 students
- GORTON HIGH SCHOOLHigh · 1,068 students
Other School 21 schools
One other US public school is named School 21. SCHOOL 21 is the 2nd largest of the 2.
- School 21PATERSON, NJ · 665 students
Nearby schools
- LAS HERMANAS MIRABAL COMMUNITY SCHOOL0.6 mi · 594
- JUSTICE SONIA SOTOMAYER COMMUNITY SCHOOL DISTRICT0.8 mi · 423
- LINCOLN HIGH SCHOOL0.9 mi · 1,176
- YONKERS MONTESSORI ACADEMY0.9 mi · 1,234
- PS 19 JUDITH K WEISS1.0 mi · 679
- YONKERS MIDDLE SCHOOL1.2 mi · 540
Frequently asked questions
About SCHOOL 21How large is SCHOOL 21?
SCHOOL 21 enrolls approximately 328 students in grades PK-06.
What age range does SCHOOL 21 serve?
SCHOOL 21 serves students from grade PK through grade 06.
How many students per teacher at SCHOOL 21?
Approximately 15.5:1 students per teacher at SCHOOL 21.
What is the student diversity at SCHOOL 21?
Student demographics at SCHOOL 21 are roughly 18% White, 61% Hispanic, 10% Black, 8% Asian, 2% Two or more.
Who oversees SCHOOL 21?
SCHOOL 21 is overseen by YONKERS CITY SCHOOL DISTRICT in Westchester County.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.