Serving 1,305 students in grades Prekindergarten-5, P.s. 321 William Penn ranks in the top 10% of all schools in New York for overall test scores (math proficiency is top 5%, and reading proficiency is top 5%).
The percentage of students achieving proficiency in math is 88% (which is higher than the New York state average of 52%). The percentage of students achieving proficiency in reading/language arts is 79% (which is higher than the New York state average of 49%).
The student-teacher ratio of 16:1 is higher than the New York state level of 11:1.
Minority enrollment is 35% of the student body (majority Hispanic and Asian), which is lower than the New York state average of 61% (majority Hispanic).
Quick Facts (2026)
- Grades: Prekindergarten-5
- Enrollment: 1,305 students
- Student-Teacher Ratio: 16:1
- Minority Enrollment: 35%
- Overall Testing Rank: Top 10% in NY
- Math Proficiency: 88% (Top 5%)
- Reading Proficiency: 79% (Top 10%)
- Science Proficiency: ≥95% (Top 5%)
- Source: National Center for Education Statistics (NCES), NY Dept. of Education
Top Rankings
P.s. 321 William Penn ranks among the top 20% of public schools in New York for:
Category
Attribute
Overall Rank
Math Proficiency
Reading/Language Arts Proficiency
Science Proficiency
School Overview
P.s. 321 William Penn's student population of 1,305 students has stayed relatively flat over five school years.
The teacher population of 81 teachers has grown by 5% over five school years.
Grades Offered
Grades Prekindergarten-5
(Supplemental Virtual)
(Supplemental Virtual)
Total Students
1,305 students
Total Classroom Teachers
81 teachers
School Calendar
School Rankings
P.s. 321 William Penn ranks within the top 10% of all 4,346 schools in New York (based off of combined math and reading proficiency testing data).
The diversity score of P.s. 321 William Penn is 0.54, which is less than the diversity score at state average of 0.73. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#224 out of 4346 schools
(Top 10%)
(Top 10%)
Math Test Scores (% Proficient)
88%
52%
Reading/Language Arts Test Scores (% Proficient)
79%
49%
Science Test Scores (% Proficient)
≥95%
78%
Student-Teacher Ratio
16:1
11:1
American Indian
n/a
1%
Asian
9%
10%
Hispanic
10%
31%
Black
2%
15%
White
65%
39%
Hawaiian
n/a
n/a
Two or more races
14%
4%
All Ethnic Groups
Participates in the National School Lunch Program (NSLP)
Yes
Eligible for Free Lunch
5%
55%
Eligible for Reduced Lunch
1%
2%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), NY Dept. of Education
Frequently Asked Questions
What is P.s. 321 William Penn's ranking?
P.s. 321 William Penn is ranked #224 out of 4,346 schools, which ranks it among the top 10% of public schools in New York.
What schools are P.s. 321 William Penn often compared to?
P.s. 321 William Pennis often viewed alongside schools like P.s. 39 Henry Bristow by visitors of our site.
What percent of students have achieved state testing proficiency in math and reading?
88% of students have achieved math proficiency (compared to the 52% NY state average), while 79% of students have achieved reading proficiency (compared to the 49% NY state average).
How many students attend P.s. 321 William Penn?
1,305 students attend P.s. 321 William Penn.
What is the racial composition of the student body?
65% of P.s. 321 William Penn students are White, 14% of students are Two or more races, 10% of students are Hispanic, 9% of students are Asian, and 2% of students are Black.
What is the student-teacher ratio of P.s. 321 William Penn?
P.s. 321 William Penn has a student ration of 16:1, which is higher than the New York state average of 11:1.
What grades does P.s. 321 William Penn offer ?
P.s. 321 William Penn offers enrollment in grades Prekindergarten-5 (Supplemental Virtual).
What school district is P.s. 321 William Penn part of?
P.s. 321 William Penn is part of New York City Geographic District #15.
In what neighborhood is P.s. 321 William Penn located?
P.s. 321 William Penn is located in the Park Slope neighborhood of Brooklyn, NY. There are 13 other public schools located in Park Slope.
School Reviews
1 10/10/2025
This school is totally overrated. The staff is rude, the needs of individual kids and families are ignored, and unless your child is perfectly self-motivated, always well-behaving, and not distracted by everything happening a very crowded classroom, he/she isn't a good fit for the school.
5 10/10/2025
This school was amazing for me. There was so much thought out into making the learning interactive (innumerable simulations, challenging projects, opportunities for group work). I am in high school and I still think that I got my best history education at PS 321. I also acceled at math and was got to do advanced work, which was exceptional at such a young age. This school prepared me effectively for middle school and helped me develop positive work/study habits. Thank you PS 321!!
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