Los Osos High
Public
High Grades 9–12 Virtual
Part of Chaffey Joint Union High
6001 Milliken Ave., Rancho Cucamonga, CA 91737 · (909) 477-6900
Community ratings
Not rated yetBe the first neighbor to rate this school — an overall score plus Teachers, Communication, Safety and Activities.
Academic performance
Math proficiency64%
State average 33.6%
Reading / language arts77%
State average 48.6%
EDFacts via Urban Institute Education Data Portal (SY2020-21)
At a glance
2,759Students enrolled
26:1Student–teacher ratio
44%Free / reduced lunch
SuburbSetting
Regular SchoolSchool type
Enrollment by grade
Grade 9721
Grade 10655
Grade 11685
Grade 12698
Students
Hispanic · 41%1,142
White · 24%674
Asian · 23%633
Black · 6%164
Two or more races · 5%135
American Indian/Alaska Native · 0%7
Native Hawaiian/Pacific Islander · 0%3
Counts as reported to NCES; percentages are of students with a reported race/ethnicity.
Enrollment · last 5 years
2,954’20
2,867’21
2,837’22
2,759’23
2,759’24
Location
6001 Milliken Ave. Rancho Cucamonga
Neighbor reviews
Sign in to rate this school.
School facts from the U.S. Department of Education (NCES), 2024-2025 school year. Academic scores from the EDFacts via Urban Institute Education Data Portal (SY2020-21). Community ratings and reviews reflect neighbor opinions, not an official measure of school quality.