A
Los Osos High
PublicHighGrades 9–12Virtual
6001 Milliken Ave., Rancho Cucamonga, CA 91737 · (909) 477-6900 · Part of Chaffey Joint Union High School District
Students
2,759
Students per teacher
26:1
Free or reduced lunch
44%
Setting
Suburb
Grades
9–12
What stands out about Los Osos High
- School Grade A: near the top of California’s public schools
- Math proficiency 30 pts above the state
- Reading / language arts 28 pts above the state
- Larger classes: 26:1 students per teacher
Test scores
EDFacts via Urban Institute Education Data Portal (SY2020-21) · 2020–21Math proficiency64%
State average 33.6%
Reading / language arts77%
State average 48.6%
Location
Directions ↗
6001 Milliken Ave., Rancho Cucamonga
Students
Enrollment by grade
Grade 9721
Grade 10655
Grade 11685
Grade 12698
Enrollment over time
2,954’20
2,867’21
2,837’22
2,759’23
2,759’24
Down 6.6% since 2020.
Who goes here
Hispanic 41%White 24%Asian 23%Black 6%Two or more races 5%American Indian/Alaska Native <1%Native Hawaiian/Pacific Islander <1%
As reported to NCES, share of students with a reported race or ethnicity.
What neighbors say
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Parents talk
Conversations in Town Square that mention Los Osos High.
Other schools in Chaffey Joint Union High School District
School facts: U.S. Department of Education (NCES), 2024-2025 school year. Scores: EDFacts via Urban Institute Education Data Portal (SY2020-21). The School Grade is our own summary of state test results. Neighbor ratings are opinions, not an official measure of school quality.