High · Regular · Grades 9 to 12
Los Osos High, Rancho Cucamonga, CA
Enrollment and teachers
- Students
- 2,759
- Teachers (FTE)
- 107.0
- Students per teacher
- 25.8
- Grades
- 9 to 12
This school's ratio is 1.6 higher than the district figure of 24.2. The California average across schools is 21.9. Ratios count all teachers, including specialists, so they are lower than typical class sizes.
School details
- Address
- 6001 Milliken Ave., Rancho Cucamonga, CA 91737
- Phone
- (909)477-6900
- District
- Chaffey Joint Union High
- County
- San Bernardino County
- Level
- High
- Type
- Regular
- Status
- Open
- Charter
- No
- Locale
- Suburb: Large
- NCES school ID
- 060816010605
School meals
- Free lunch
- 833
- Reduced-price lunch
- 373
- Free or reduced-price lunch
- 1,20643.7% of enrollment.
- Direct certification
- 534Students certified through programs such as SNAP, without an application.
- Community Eligibility Provision
- Yes (CEP school)
Schools in the Community Eligibility Provision (CEP) serve free meals to all students, so their free lunch counts often reflect direct certification or total enrollment. Free and reduced lunch shares are not comparable between CEP and non-CEP schools.
Related schools
Other high schools in Chaffey Joint Union High
- Etiwanda High 3,446 students
- Rancho Cucamonga High 3,221 students
- Chaffey High 3,127 students
- Montclair High 2,515 students
- Alta Loma High 2,386 students
- Colony High 2,109 students
- Ontario High 1,994 students
- Valley View High (Continuation) 370 students
- Chaffey District Online High 93 students
- Chaffey Community Day 20 students
We publish official enrollment and staffing data, not ratings or test scores.
Source: NCES Common Core of Data 2024-25 and F-33 finance 2020, via the Urban Institute Education Data Portal. Last reviewed October 2026. Blank values are not available, not applicable or suppressed in the source. See the methodology.