Rancho Cucamonga High
Public · Grades 9–12 · 3,221 students
Los Osos High
6001 Milliken Ave., Rancho Cucamonga, CA 91737
Grades
9–12
High
Students
2,759
Enrolled 2024–25
Students per teacher
25.8 : 1
Full-time teachers
District
Chaffey Joint Union High
San Bernardino County
Schola Grade A · Excellent
Letter grade (A–F) · compared with 1,321 California high schools · How we grade
Percentiles compare this school with other California high schools; the line marks the middle. Data: test scores 2021–22, graduation and absenteeism 2022–23 (U.S. Department of Education, EDFacts); coursework 2023–24 (Civil Rights Data Collection); staffing 2024–25 (NCES).
About Los Osos High
Los Osos High is a public high school in Rancho Cucamonga, California, serving grades 9–12. It is part of Chaffey Joint Union High. The school is located in a large suburb in San Bernardino County.
In the 2024–25 school year, 2,759 students were enrolled, with about 25.8 students for every full-time teacher. That ratio is larger than the typical California high school (18.5 students per teacher). Its Schola Grade is A (excellent), compared with 1,321 California high schools.
Grades & enrollment
Students per grade, 2024–25Grades 9–12
Location & nearby schools
School details
- Type
- Public School · What this means
- Level
- High
- Grades offered
- 9–12
- Enrollment (2024–25)
- 2,759 students
- Students per teacher
- 25.8 to 1
- AP courses offered
- 18
- Charter school
- No
- Magnet school
- No
- Virtual learning
- Offers virtual courses
- Locale
- Suburb — Large
- School district
- Chaffey Joint Union High
- County
- San Bernardino County
- NCES school ID
- 060816010605
Schools near Los Osos High
All 22 schools in Rancho Cucamonga →
Etiwanda High
Public · Grades 9–12 · 3,446 students
Alta Loma High
Public · Grades 9–12 · 2,386 students
Frohlich Intl Preparatory Academy
Private · Grades 7–8 · 9 students
Chaffey Community Day
Alternative · Grades 9–12 · 20 students
Chaffey District Online High
Alternative · Grades 9–12 · 93 students
School data comes from the U.S. Department of Education: the National Center for Education Statistics (NCES) Common Core of Data and EDGE school locations (2024–25) and Private School Survey (2023–24), the Civil Rights Data Collection (2023–24), and EDFacts (test results 2021–22; graduation and chronic absenteeism 2022–23), plus other public sources. Please contact the school to confirm enrollment, programs, and other details. How we source data.