High school · Chaffey Joint Union High School District
Los Osos High
Los Osos High serves grades 9–12 for 2,759 students in Chaffey Joint Union High School District.
It is the 3rd largest of the 4 Chaffey Joint Union High School District high schools in Rancho Cucamonga. Its 25.1 students per teacher compares with a median of 25.3 for those schools. Enrollment fell from 2,970 in 2019–20 to 2,759 in 2023–24. Its largest grade in 2023–24 was grade 12, with 739 students. 34% of students qualified for free or reduced-price lunch (867 free, 83 reduced-price). Federal records list it as not a Title I school in 2019–20. The closest park is Kenyon Park (0.8 mi).
Los Osos High by the numbers
Student–teacher ratio is not classroom size.
Students at Los Osos High
Parks near Los Osos High
Address, phone and official links
6001 Milliken Ave., Rancho Cucamonga 91737
Chaffey Joint Union High School District website ↗California School Dashboard report cards ↗NCES school record ↗Directions ↗
State school ID 3631058 (search it on California School Dashboard) · NCES ID 060816010605
Other high schools in the district
Schools nearby
Source: NCES Common Core of Data 2019–20 to 2023–24, via the Urban Institute Education Data Portal; parks from OpenStreetMap. Contact the school or district to confirm enrollment boundaries, schedules and programs.