William Floyd High School, Mastic Beach NY

Original Research by School Decision on William Floyd High School

William Floyd High School is a comprehensive four-year public high school in Mastic Beach, serving students from across the William Floyd Union Free School District's service area, which includes the communities of Mastic Beach, Shirley, Mastic, and Moriches on Long Island's South Shore. The school draws a diverse student body reflective of the broader South Shore demographic makeup.

The student population includes a substantial proportion of students who qualify for free or reduced-price lunch, a marker of economic need across the district. The school's enrollment is moderately sized for its grade band, distributed fairly evenly across grades nine through twelve. Student demographics are notably diverse, with students of Hispanic, Black, White, and Asian backgrounds represented, as well as students identifying as two or more races. The racial and ethnic composition reflects the varied residential character of the South Shore communities the district serves.

Academic data from state testing in 2024-25 was not available for this high school, which is typical because New York does not administer state standardized tests to grades nine through twelve in the core subjects. This means proficiency metrics comparable to those available for middle grades and elementary schools do not apply. A graduation rate was not included in the available data. Without these measures, a parent seeking to understand the school's overall academic trajectory relative to other schools in Suffolk County will need to seek additional information directly from the school or district, such as course enrollment patterns, Advanced Placement offerings, dual-enrollment pathways, college acceptance data, or teacher qualifications.

The district itself has taken several financially and pedagogically relevant steps in recent years. Voters approved a substantial capital improvement project in 2025 funded largely through state reimbursement and previously established reserve funds rather than new local tax burden, addressing aging infrastructure and expanded classroom space across buildings. The district has also maintained a low property tax environment, holding or reducing taxes in four of the past several years, which shapes the cost of residence in the district's communities. Beginning in the 2025-26 school year, the district adopted a state-mandated distraction-free schools policy limiting student phone and internet-device use during instructional time.

Mastic Beach itself is a predominantly residential waterfront hamlet on the Town of Brookhaven's South Shore, characterized by modest single-family homes, salt marshes, and bayfront properties built largely between the 1930s and 1990s. The hamlet experienced economic challenges in recent years, including damage from Hurricane Sandy, but is now in an active revitalization phase. A major redevelopment project along Neighborhood Road, the hamlet's main commercial corridor, is advancing to replace blighted properties with mixed-use space including apartments, townhouses, restaurants, and retail. The defining civic anchor is the William Floyd Estate, a waterfront National Historic Landmark with trails and waterfront park access. Public transit runs via the Long Island Rail Road's Mastic-Shirley station and local bus service.

A parent or resident considering this school should visit the William Floyd High School and district websites to gather information on course offerings, college and career pathways, extracurricular programs, and recent outcome data the school tracks and publicly reports. The school sits within a district that has prioritized fiscal restraint and facility modernization, and within a community undergoing planned neighborhood revitalization and infrastructure investment.

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Academic performance

State test results and graduation outcomes.

Graduation rate (ACGR)

91.0%Cohort of 684 students · Class of 2021

How this school compares to all schools in this state

Each dot is one school’s SY 2020-21 graduation rate, binned by integer rate. Taller columns mean more schools at that rate. This school is highlighted.

1,253 schools plotted. 14 additional schools' rates are federally suppressed and not shown. Data: EDFacts SY 2020-21.

Advanced Placement & IB

21 subjects offered · 2023-24

Each card is one AP or IB subject. The headline number is the share of students scoring 3 or higher on the exam — the threshold for college credit at most universities. The bar below each rate shows the underlying distribution across performance levels.

Score:12· no credit345· extremely well qualified

Math and Computer Science

Calculus AB

25 tested

64.0%

scored 3 or higher

Calculus BC

16 tested

87.5%

scored 3 or higher

Computer Science A

20 tested

75.0%

scored 3 or higher

Computer Science Principles

36 tested · Grade 10

72.2%

scored 3 or higher

Sciences

Biology

11 tested

63.6%

scored 3 or higher

Chemistry

49 tested

85.7%

scored 3 or higher

Environmental Science

14 tested

64.3%

scored 3 or higher

Physics 1

30 tested

56.7%

scored 3 or higher

Physics C: Mechanics

24 tested

50.0%

scored 3 or higher

English

Research

13 tested

92.3%

scored 3 or higher

Seminar

19 tested · Grade 10

84.2%

scored 3 or higher

History and Social Sciences

Macroeconomics

15 tested

93.3%

scored 3 or higher

U.S. History

72 tested

86.1%

scored 3 or higher

World Languages and Cultures

Spanish Language and Culture

29 tested

82.8%

scored 3 or higher

Arts

Music Theory

7 tested

100.0%

scored 3 or higher

Studio Art Drawing

13 tested

84.6%

scored 3 or higher

Other

Language and Comp

51 tested

58.8%

scored 3 or higher

Literature and Comp

31 tested

90.3%

scored 3 or higher

Studio Art 2d Design

4 tested

0.0%

scored 3 or higher

U S Government and Politics

37 tested

86.5%

scored 3 or higher

World History

57 tested · Grade 10

80.7%

scored 3 or higher

New York Regents Exams

4 courses reported · 2024-25

End-of-course exams required for a New York Regents diploma. Each row shows the cohort size and the share of students scoring at the proficient level or higher.

Course	Students tested	% proficient
Ela	891	70.0%
Social Studies	683	75.0%
Math	436	42.0%
Science	257	68.0%

Math

Grade 80%

School 0% · district not reported

▼ 37 pts below state median · ▼ 25 pts below county median

English language arts

Grade 80%

School 0% · District 42% · ▼ 41 pts below district

▼ 48 pts below state median · ▼ 44 pts below county median

Science

Grade 80%

School 0% · District 0%

▼ 33 pts below state median · ▼ 27 pts below county median

This schoolWILLIAM FLOYD UNION FREE SCHOOL DISTRICT, same grade

Graduation rate (ACGR) reflects the federally published Adjusted Cohort Graduation Rate for the most recent year available. We refresh this data annually at the close of each academic year in June. The federal source publishes a banded rate (for example, "90-94%") instead of an exact number for cohorts small enough to risk identifying individual students. The state distribution chart, where shown, plots every school in the state with a published rate or band; schools whose rate is federally suppressed are excluded. Where the federal source publishes a band rather than an exact rate, the school is placed within its band using a stable, ID-derived offset, so its position is consistent across visits.