- Enrollment
- 2,405
- Students per teacher
- 12.8:1
- Resource Index
- 55/100
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 →
CCD year-over-year · 2022-23 → 2023-24
-15 students YoY
Wm Diamond Middle held near 927 students from 2022-23 to 2023-24 (-15 headcount).
Teacher FTE added 93.3 → 98.5 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
-15 students YoY 250684002552 · Lexington, MA Middle · MID · TRAD
936 enr · 10.1:1 · RII 44
Nearest enrollment peer: Lexington High (2,405 students)
Wm Diamond Middle held near 927 students from 2022-23 to 2023-24 (-15 headcount). Teacher FTE added 93.3 → 98.5 across the same CCD years. Read with this school → · District book → · Massachusetts schools → · Find another →
Wm Diamond Middle in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Lexington High
Lexington High
2,405 students
- This school 936
Wm Diamond Middle
936 students
- Jonas Clarke M 796
Jonas Clarke Middle
796 students
- Maria Hastings 579
Maria Hastings
579 students
- Joseph Estabro 490
Joseph Estabrook
490 students
- Bowman 429
Bowman
429 students
What this shows Wm Diamond Middle reports 936 students on the CCD universe file.
How Wm Diamond Middle compares
Wm Diamond Middle held steady on CCD headcount: ratios and free-lunch share vs 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 methodology
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
$25,657
per pupil, district-wide
- above Massachusetts avg of $23,695
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.
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
District finance for Lexington reports $25,657 per pupil (NCES F-33) - open the district page for the full revenue mix.
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
- 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.
Nationwide middle schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~936 students)
Similar student-teacher ratio (~10.1:1)
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. CCD year-over-year: 942 (2022-23) → 927 (2023-24), nearly flat (-15).
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, gifted-program reporting, counselor availability, chronic absenteeism. 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.
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.