You'll find this misleading claim above on cupertinofacts.org
This misleads by not stating what the bars / numbers mean. The graph alone can easily be read as average school attendance
The Data
Using Average School Attendance as the crowding measure
Data taken from the cupertinofacts.org source for 2021-2022 school year attendance
Note: average classroom size would be a much better measure of school crowding
Sunnyvale has largest average Elementary Enrollment
Circled in green above is the average Sunnyvale Elementary School attendance of 487. Cupertino Elementary School average attendance is lower, at 465. Cupertino does NOT have the most crowded Elementary Schools in Silicon Valley.
Los Gatos has the largest average Middle School Enrollment
Circled in green above is the average Los Gatos Middle School attendance of 1038. Cupertino average Middle School attendance is lower, at 904. Cupertino does NOT have the most crowded Middle Schools in Silicon Valley.
Data Source: https://dq.cde.ca.gov/dataquest
From the 2021-22 school year