MS 51 WILLIAM ALEXANDER

MS 51 WILLIAM ALEXANDER is a sprawling junior high in BROOKLYN, New York, one of the schools within NEW YORK CITY GEOGRAPHIC DISTRICT #15. The school educates 1,038 students in grades 6 through 8. Enrollment runs roughly 95% above the state mean of about 531.

Across the 51 schools in NEW YORK CITY GEOGRAPHIC DISTRICT #15 (25,925 students total), MS 51 WILLIAM ALEXANDER accounts for its share of the district's footprint.

In terms of who attends, MS 51 WILLIAM ALEXANDER reports that 32% of students identify as Hispanic, with the remaining enrollment distributed across several groups; the rest looks like 27% Asian, 26% White, 7% multiracial, 7% Black. By comparison, Kings County as a whole is about 19% Hispanic, so the school skews noticeably more Hispanic than its surroundings.

On the income-and-resources front, On paper, MS 51 WILLIAM ALEXANDER has 73 full-time-equivalent teachers, translating to a class-load average of around 14.2:1. That figure is higher than the state norm's 10.3:1 average. About 60% of enrolled students meet the income threshold for free or reduced-price lunch, a number frequently used as a low-income enrollment indicator. By comparison, Kings County runs at roughly 79%, so the school's eligibility rate is meaningfully below the surrounding baseline.

After controlling for student poverty, MS 51 WILLIAM ALEXANDER sits in the middle band of the BeatsExpectations distribution. Schools with this campus's student mix typically land near 52.9%; this one delivers 67.9%.

Around the school, community-level numbers for Kings County indicate median household income runs about $80,263, about 42% of the adult population holds a bachelor's degree or above, and the poverty rate sits near 15%. MS 51 WILLIAM ALEXANDER is one of 583 public schools in Kings County (combined enrollment of about 291,697 students).

MAURICE SENDAK COMMUNITY SCHOOL (THE) is the nearest neighboring public school, about 0.2 miles from this campus. Within five miles, there are 8 other public schools. Ranking that nearby cluster on reported proficiency puts MS 51 WILLIAM ALEXANDER at 5th of 8; the average score across the group is 70.6%.

The campus sits in a high-density setting.

Trend over the last 7 years. MS 51 WILLIAM ALEXANDER's enrollment has ticked down 8% since 2018, when it stood at 1,132 (now 1,038). White enrollment moved from 51% to 26% across the same window. Class-load math has fell: from 17.1:1 in 2018 to 14.2:1 in 2025.

In the discussion threads here, posts here usually surface around school events, parent volunteer needs, and clubs. Members of the school community can share what they know.