Enrollment
936
Massachusetts · 2024-25 NCES data
Middle school (grades 6-8) · Lexington, MA
Wm Diamond Middle
Federal NCES profile for Wm Diamond Middle, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 44/100.
2024-25 NCES dataMiddle school (grades 6-8)NCES 250684002552
👥 S:T ratio 60
🌟 Gifted program 30
🎓 Counselors 6
📋 Attendance 79
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Wm Diamond Middle earns 44/100 on the Resource Investment Index, with class sizes smaller than 79% of Massachusetts schools.
- #9 of 11
- public schools in Lexington · Resource Index
- 44
- Resource Index · Typical
- 10.1:1
- small classes for Massachusetts
- 936
- students enrolled
Wm Diamond Middle has class sizes smaller than 79% of Massachusetts schools. Computed live against every Massachusetts school reporting to NCES.
By Resource Investment Index, Wm Diamond Middle ranks #9 of 11 public schools in Lexington, MA.
School address
District: Lexington · Massachusetts
NCES ID 250684002552 Verify on NCES CCD record →
Teachers (FTE)
93.0
Federal CCD staff survey
Students per teacher
10.1:1
vs 12.3:1 Massachusetts avg
-18% vs state
Student-teacher ratio in context
How Wm Diamond Middle compares with Massachusetts and U.S. medians
What stands out at Wm Diamond Middle
Wm Diamond Middle is a large middle school in Lexington, Massachusetts, enrolling 936 students.
Class sizes run a bit leaner than typical: 10.1:1 puts it in the smaller third of Massachusetts schools by student-teacher ratio.
By headcount it is one of the larger campuses in Massachusetts, bigger than 91% of state schools at 936 students.
Its Resource Investment Index sits near the middle of the pack among 1,831 scored Massachusetts schools.
Its student body is led by Asian (45%) and White (35%) (diversity index 66/100).
Counselor access is stretched at roughly 468 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Attendance holds up well here: only 8.5% of students were chronically absent, below the typical post-pandemic national figure.
Among Lexington's middle schools, it stands alongside Jonas Clarke Middle (796 students): Wm Diamond Middle is larger than that campus by headcount and runs heavier classes (10.1:1 vs 9.1:1).
Lexington also operates Lexington High (2,405 students) and Jonas Clarke Middle (796 students) alongside Wm Diamond Middle.
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Wm Diamond Middle compares
Wm Diamond Middle on the metrics families compare, against Massachusetts and U.S. means.
| Metric | This school | vs Massachusetts | Massachusetts avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 10.1:1 | ▼ 18% | 12.3:1 | 15.7:1 |
| Enrollment | 936 | top 9% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
10.1:1
Leaner classes than 88% of US schools, among the more generously staffed nationally.
936
Bigger than 90% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Staffing depth
10.1:1
students per teacher
- 18% below state mean
Top 21% in Massachusetts - lower ratio than 79% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
8.5%
chronically absent (missed 10%+ of school days)
In the 5-10% range, close to the pre-pandemic national baseline.
Funding equity
$24,326
per pupil, district-wide
- above Massachusetts avg of $22,458
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors2.0 FTE
Per 468 students, the combined health-and-guidance staffing load for this school.
Discipline context
9
in-school suspensions + 5 out-of-school
Suspension rate: 1.0 per 100 students. Combined in-school and out-of-school rate: 1.5 per 100 students. Reported via the Civil Rights Data Collection.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
Student demographics
Asian 44.6%
White 35.1%
Two or More 8.7%
Hispanic or Latino 7.6%
African American 4.1%
Largest group: Asian at 44.6% of enrollment.
Student-body diversity index 66.3/100
Simpson diversity index - at 66.3, Wm Diamond Middle is more mixed than the Massachusetts school average of 47.3.
Programs
Funding & spending
District-wide per-pupil expenditure for Lexington, which includes Wm Diamond Middle.
$24,326
Per student
+8%
vs Massachusetts
Avg $22,458
+47%
vs U.S.
Avg $16,593
Revenue mix
Local 74.4%
State 22.1%
Federal 3.5%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
How Wm Diamond Middle Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Lexington High | Larger | No free-lunch data | Higher S:T ratio |
| Jonas Clarke Middle | Similar size | No free-lunch data | Similar S:T ratio |
| Maria Hastings | Smaller | No free-lunch data | Similar S:T ratio |
| Joseph Estabrook | Smaller | No free-lunch data | Similar S:T ratio |
| Bowman | Smaller | No free-lunch data | Higher S:T ratio |
Comparisons are relative to Wm Diamond Middle's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 2,405
- Students per teacher
- 12.8:1
- Resource Index
- 55/100
- Enrollment
- 796
- Students per teacher
- 9.1:1
- Resource Index
- 56/100
- Enrollment
- 579
- Students per teacher
- 11.4:1
- Resource Index
- 43/100
- Enrollment
- 490
- Students per teacher
- 11.4:1
- Resource Index
- 41/100
- Enrollment
- 429
- Students per teacher
- 11.6:1
- Resource Index
- 46/100
Similar middle schools in Lexington
1 comparable middle schools (grades 6-8) serving the same city.
Similar middle schools statewide
Matched by enrollment size and by staffing ratio across all of Massachusetts, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~936 students)
Similar student-teacher ratio (~10.1:1)
Next steps
Verify locally before acting on Wm Diamond Middle's federal record.
- Compare Wm Diamond Middle against another school. Compare schools
- Lexington's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
Frequently asked questions about Wm Diamond Middle
How many students attend Wm Diamond Middle?
Wm Diamond Middle has 936 students enrolled. It is a middle school in Lexington, MA.
What is the student-teacher ratio at Wm Diamond Middle?
The student-teacher ratio at Wm Diamond Middle is 10.1:1, which is 18% lower than the Massachusetts average of 12.3:1 and 36% lower than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What is the racial and ethnic makeup of Wm Diamond Middle?
The largest demographic group at Wm Diamond Middle is Asian at 44.6% of enrollment, in Lexington, MA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 66.3/100.
What is the Resource Investment Index for Wm Diamond Middle?
Wm Diamond Middle has a Resource Investment Index of 44/100 (typical reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, counselor availability, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Wm Diamond Middle rank among public schools in Lexington?
By Resource Investment Index, Wm Diamond Middle ranks #9 of 11 public schools in Lexington, MA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Lexington on the city page.
Is Wm Diamond Middle a good school?
Wm Diamond Middle earns 44/100 on the Resource Investment Index, with class sizes smaller than 79% of Massachusetts schools. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
What other schools are in Lexington?
Besides Wm Diamond Middle, Lexington also operates Lexington High (2,405 students), Jonas Clarke Middle (796 students), and Maria Hastings (579 students). See the Lexington district page for the complete list.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.