B- Top 57%

King Open School

Grades PK-05 CAMBRIDGE, MA

Moved down 152 places from 2024 to 2025

#473 State Rank
A- District Grade
850 Cambridge Street, CAMBRIDGE, MA 02139
Diverse
Rating sources & methodology MCAS scores from 2025 Data updated September 2026
437 Students
94.7% Attendance Rate
45.4 Composite Score
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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

43.7% Meeting or exceeding expectations

7% exceeding expectations

2023 36.7% 36.7%
2024 47% 47%
2025 43.7% 43.7%

Mathematics

42% Meeting or exceeding expectations

9.7% exceeding expectations

2023 40% 40%
2024 46.3% 46.3%
2025 42% 42%

Science

34% Meeting or exceeding expectations

8% exceeding expectations

2023 43% 43%
2024 27% 27%
2025 34% 34%
View published results by year and grade
Available grade results for the latest 3 published years. An em dash means the value was not published.
YearSubjectGradeMeeting+Exceeding
2025English Language Arts03 42%4%
2025English Language Arts04 53%—
2025English Language Arts05 36%10%
2025Mathematics03 35%7%
2025Mathematics04 57%12%
2025Mathematics05 34%10%
2025Science05 34%8%
2024English Language Arts03 68%14%
2024English Language Arts04 41%8%
2024English Language Arts05 32%7%
2024Mathematics03 60%14%
2024Mathematics04 47%18%
2024Mathematics05 32%—
2024Science05 27%5%
2023English Language Arts03 39%4%
2023English Language Arts04 38%7%
2023English Language Arts05 33%—
2023Mathematics03 37%9%
2023Mathematics04 31%2%
2023Mathematics05 52%7%
2023Science05 43%2%

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

437 students enrolled

Race/Ethnicity

White 31.4%
Black 22.7%
Hispanic 19.2%
Multiracial 14.9%
Asian 11.9%

Gender

54% Male
46% Female

Student Programs

English Learners 15.1%
Special Education 24.7%
Free/Reduced Lunch 42.1%

School Performance

Key metrics and program information

Attendance

94.7% Attendance Rate
14.1% Chronic Absence

Staffing

Location

850 Cambridge Street, CAMBRIDGE, MA

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B--Rated School

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Frequently Asked Questions

What is King Open School's grade rating?

King Open School has earned a grade of B-, ranked #473 in Massachusetts, placing it in the top 57% of Massachusetts Elementary 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 King Open School?

Approximately 437 students are enrolled at King Open School.

How does King Open School perform on MCAS tests?

Based on the most recent MCAS results, King Open School's proficiency rates are: English Language Arts (44% proficient), Mathematics (42% proficient), Science (34% proficient). MCAS (Massachusetts Comprehensive Assessment System) tests measure student achievement in English Language Arts, Mathematics, and Science.

What is the attendance rate at King Open School?

King Open School has an attendance rate of 94.7%. Strong attendance is correlated with better academic outcomes.

What school district is King Open School part of?

King Open School is part of Cambridge 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.