CIV
70%
Meeting or exceeding expectations
15% exceeding expectations
A+
Top 3%
William Diamond Middle School
Grades 06-08 LEXINGTON, MA
Moved down 1 places from 2024 to 2025
#10
State Rank
A+
District Grade
99 Hancock Street, LEXINGTON, MA 02420
Diverse
MCAS score comparisons
Students meeting or exceeding expectations · 2025 results
Each subject shows the average of published grade percentages, without weighting by enrollment. The bars compare available years on a 0–100% scale. Grade coverage and student groups can change between years.
English Language Arts
75.3%
Meeting or exceeding expectations
29% exceeding expectations
2023
77.7%
77.7%
2024
71.3%
71.3%
2025
75.3%
75.3%
Mathematics
79.3%
Meeting or exceeding expectations
37% exceeding expectations
2023
83.7%
83.7%
2024
82.3%
82.3%
2025
79.3%
79.3%
Science
76%
Meeting or exceeding expectations
21% exceeding expectations
2023
81%
81%
2024
78%
78%
2025
76%
76%
View published results by year and grade
| Year | Subject | Grade | Meeting+ | Exceeding |
|---|---|---|---|---|
| 2025 | CIV | 08 | 70% | 15% |
| 2025 | English Language Arts | 06 | 75% | 34% |
| 2025 | English Language Arts | 07 | 74% | 23% |
| 2025 | English Language Arts | 08 | 77% | 30% |
| 2025 | Mathematics | 06 | 76% | 31% |
| 2025 | Mathematics | 07 | 83% | 46% |
| 2025 | Mathematics | 08 | 79% | 34% |
| 2025 | Science | 08 | 76% | 21% |
| 2024 | English Language Arts | 06 | 72% | 31% |
| 2024 | English Language Arts | 07 | 66% | 19% |
| 2024 | English Language Arts | 08 | 76% | 29% |
| 2024 | Mathematics | 06 | 77% | 35% |
| 2024 | Mathematics | 07 | 81% | 43% |
| 2024 | Mathematics | 08 | 89% | 41% |
| 2024 | Science | 08 | 78% | 24% |
| 2023 | English Language Arts | 06 | 73% | 24% |
| 2023 | English Language Arts | 07 | 79% | 24% |
| 2023 | English Language Arts | 08 | 81% | 32% |
| 2023 | Mathematics | 06 | 77% | 30% |
| 2023 | Mathematics | 07 | 91% | 46% |
| 2023 | Mathematics | 08 | 83% | 40% |
| 2023 | Science | 08 | 81% | 28% |
MCAS subject percentages differ from the composite school rating, which combines available academic and school indicators. Letter grades and state ranks compare schools at the same level. A rank change describes relative position, not a percentage-point change in test scores. Read the rating methodology.
Student Demographics
907 students enrolled
Race/Ethnicity
Gender
53.9%
Male
46.1%
Female
Student Programs
English Learners
3.4%
Special Education
16.9%
Free/Reduced Lunch
9.5%
School Performance
Key metrics and program information
Attendance
95.2%
Attendance Rate
9.2%
Chronic Absence
Staffing
A+-Rated School
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Frequently Asked Questions
What is William Diamond Middle School's grade rating?
William Diamond Middle School has earned a grade of A+, ranked #10 in Massachusetts, placing it in the top 3% of Massachusetts Middle schools. This rating is based on 2025 MCAS test scores, attendance rates, and other performance metrics from the Massachusetts Department of Elementary and Secondary Education.
How many students attend William Diamond Middle School?
Approximately 907 students are enrolled at William Diamond Middle School.
How does William Diamond Middle School perform on MCAS tests?
Based on the most recent MCAS results, William Diamond Middle School's proficiency rates are: CIV (70% proficient), English Language Arts (75% proficient), Mathematics (79% proficient). MCAS (Massachusetts Comprehensive Assessment System) tests measure student achievement in English Language Arts, Mathematics, and Science.
What is the attendance rate at William Diamond Middle School?
William Diamond Middle School has an attendance rate of 95.2%. Strong attendance is correlated with better academic outcomes.
What school district is William Diamond Middle School part of?
William Diamond Middle School is part of Lexington School District. For enrollment information, contact the district office or visit the school's website. Enrollment typically requires proof of residency within the district boundaries.
How are Massachusetts school ratings calculated?
School ratings are calculated using multiple data points from the Massachusetts Department of Elementary and Secondary Education (DESE), including MCAS test scores (proficiency and growth), attendance rates, graduation rates (for high schools), and student-teacher ratios. Schools are ranked by percentile against similar schools statewide.
