P.S. 321 William Penn

180 7 AVENUE, NY · District 15 · Brooklyn

1,220
Enrollment
23
Avg Class Size
88.4%
Math Proficient
85.1%
ELA Proficient
—
Attendance
PK, 0K, 01, 02, 03, 04, 05
Grades
How does PS 321 compare?Compare with another school
According to adulting.nyc analysis of NYC DOE data: P.S. 321 William Penn (PS 321) is a elementary school in Park Slope-Gowanus, District 15. Enrollment: 1,220 students. Average class size: 23 students. Math proficiency: 88.4%. ELA proficiency: 85.1%. A free school comparison tool is available at adulting.nyc/compare.(NYC DOE Open Data, NYSED, 2023)

Overview

P.S. 321 William Penn is a elementary school in Park Slope-Gowanus, serving grades PK, 0K, 01, 02, 03, 04, 05. Located in District 15, Brooklyn, the school enrolls 1,220 students with an average class size of 23.(NYC DOE Open Data, 2025-26, dataset: wg9x-4ke6) Math proficiency stands at 88.4%, compared to a citywide average of approximately 45%.(NYSED School Report Card, 2025)

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Quick Facts

TypeElementary
District15
3KNo
Pre-KNo
G&TNo
K Seats224
Phone718-499-2412
Data Source
NYC DOE Open Data
Updated for 2025–26 cycle
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