Home › California › Rancho Cucamonga › Los Osos High

Los Osos High

Rancho Cucamonga, California · Grades 9 to 12 · Chaffey Joint Union High

Public school

About Los Osos High

Los Osos High is a public school in Rancho Cucamonga, California, serving grades 9 through 12. Enrollment was 2,759 in the 2024-25 school year. With about 107.1 full-time-equivalent teachers, that works out to roughly 25.8 students per teacher. Chaffey Joint Union High runs 11 schools listed here, including this one. See them all. The surrounding area is classified as a suburb of a large metro area, in San Bernardino County. There are 55 other schools within 5 miles.

Open Houses & Tours

Los Osos High hasn't posted any open houses, tours, kindergarten roundups or school choice fairs here yet.

Planning a visit? Call the school at (909) 477-6900 to ask about tours, kindergarten registration and open house dates, or sign up below and we'll email you when schools near you post visit dates.

Work at this school? Add your next open house or tour for free. It takes about two minutes.

Add a visit event Get visit alerts

Parent reviews

No reviews yet. If your child goes here, or went here, your experience can help another family decide.

Be the first to review

Every review is checked against our moderation policy before it appears. We never remove a review because it is negative. ParentSchoolReview is owned and operated by School Success. Disclosure.

School facts

Address	6001 Milliken Ave., Rancho Cucamonga, CA 91737
Phone	(909) 477-6900
School district	Chaffey Joint Union High
Grades	9 to 12
Students (2024-25)	2,759
Teachers (full-time equivalent, 2024-25)	107.1
Students per teacher	25.8
Charter school	No
School type	Regular
Level	High
Locale (NCES)	Suburb, large, San Bernardino County

Source: NCES Common Core of Data (CCD), 2024-25 public school directory and membership files (NCES school ID 060816010605). Details may have changed since the survey. Schools can update them by claiming this profile.

Nearby schools

Caryn ElementaryPublic · Grades K to 5Alta Loma, CA · 0.4 mi Banyan ElementaryPublic · Grades K to 6Alta Loma, CA · 0.6 mi Rancho Cucamonga HighPublic · Grades 9 to 12Rancho Cucamonga · 1.1 mi Victoria Groves ElementaryPublic · Grades K to 6Alta Loma, CA · 1.2 mi Carleton P. Lightfoot ElementaryPublic · Grades K to 5Alta Loma, CA · 1.2 mi John L. Golden ElementaryPublic · Grades K to 5Etiwanda, CA · 1.3 mi Day Creek IntermediatePublic · Grades 6 to 8Etiwanda, CA · 1.3 mi Vineyard Junior HighPublic · Grades 6 to 8Alta Loma, CA · 1.6 mi

The 8 closest public, charter and private schools by straight-line distance, from NCES location data. Listings here are never paid.

Frequently asked questions

What grades does Los Osos High serve?

Los Osos High serves grades 9 through 12.

How many students attend Los Osos High?

Los Osos High reported 2,759 students in 2024-25, according to the NCES Common Core of Data.

What is the student-teacher ratio at Los Osos High?

About 25.8 students per full-time-equivalent teacher, based on 2,759 students and 107.1 teachers in federal data.

Is Los Osos High a public or charter school?

Los Osos High is a traditional public (non-charter) school.

What school district is Los Osos High in?

Los Osos High is part of Chaffey Joint Union High. See all schools in this district at https://parentschoolreview.com/districts/ca/chaffey-joint-union-high/

Where is Los Osos High located?

Los Osos High is at 6001 Milliken Ave., Rancho Cucamonga, CA 91737. The phone number is (909) 477-6900.

How many other schools are near Los Osos High?

There are 55 other schools within 5 miles of Los Osos High in our directory.