Los Osos High
Rancho Cucamonga, CA · Chaffey Joint Union High
Regular public school · Grades 9-12 · Suburb, large
162nd of 1,528 California high schools statewide · better than 89%· Stable
6001 Milliken Ave., Rancho Cucamonga, CA 91737
(909) 477-6900Official website ↗NCES ID 060816010605Directory 2023–24
SchoolRow ranks Los Osos High 162nd of 1,528 California high schools for 2024–25, based on CAASPP 2024–25 English and Math results — better than 89% of high schools statewide. Its statewide percentile went from 87th in 2015 to 89th in 2025.
Percent meeting or exceeding the state standard, CAASPP 2024–25 · 636 students tested
Racial and ethnic breakdown of 2,759 students (2023–24, NCES) — history since 2002, with comparable seven-category changes from 2010
| Group | Trend | 2010 | 2023 | Change |
|---|---|---|---|---|
| Hispanic | 30.7% | 40.7% | ▲ 10.0 pts | |
| White | 42.6% | 27.1% | ▼ 15.5 pts | |
| Asian | 12.3% | 22.0% | ▲ 9.7 pts | |
| Black | 11.3% | 6.0% | ▼ 5.3 pts | |
| Two or more races | 2.3% | 3.7% | ▲ 1.4 pts |
NCES history for this school begins in 2002. Race categories changed by 2010: earlier data combines Asian and Pacific Islander students and does not consistently identify multiracial students. The chart retains that history, while the change table uses 2010 onward.
Typical home value $958K in zip 91737 as of 2026-05 · trend since 2000
Data Provided by Zillow Group
Closest same-level schools, with 2024–25 state rank · ▲▼ = points better or worse than Los Osos High
- #256Rancho Cucamonga HighChaffey Joint Union High · 0.9 mi away256th of 1,528
ELA 75% ▼4 · Math 43% ▼8Compare - #175Etiwanda HighChaffey Joint Union High · 2.9 mi away175th of 1,528
ELA 81% ▲2 · Math 46% ▼5Compare - #359Alta Loma HighChaffey Joint Union High · 3.4 mi away359th of 1,528
ELA 72% ▼7 · Math 33% ▼18Compare - –Chaffey Community DayChaffey Joint Union High · 4.9 mi awayCompare
- –Chaffey District Online HighChaffey Joint Union High · 5 mi awayCompare
- #1379Valley View High (Continuation)Chaffey Joint Union High · 5.1 mi away1,379th of 1,528
ELA 11% ▼68 · Math 3% ▼48Compare - #320Summit HighFontana Unified · 5.3 mi away320th of 1,528
ELA 76% ▼3 · Math 35% ▼16Compare - #394Upland HighUpland Unified · 6.2 mi away394th of 1,528
ELA 66% ▼13 · Math 37% ▼14Compare
What school district is Los Osos High in?
Los Osos High is part of the Chaffey Joint Union High district in Rancho Cucamonga, California.
Is Los Osos High a good school?
SchoolRow ranks Los Osos High 162nd of 1,528 California high schools (better than 89% statewide) based on 2024–25 test results (CAASPP 2024–25).
What is the racial makeup of Los Osos High?
Hispanic 41%, White 27%, Asian 22%, Black 6% (2,759 students, 2023–24).
How much do homes near Los Osos High cost?
The typical home value in zip code 91737 is $958K as of 2026-05 (Zillow ZHVI).
Sources: state education department data (CAASPP 2024–25, low-income, chronic absenteeism), National Center for Education Statistics via the Urban Institute (enrollment, demographics, staffing), Zillow Group (home values). Rankings are computed by SchoolRow from state English and Math results within grade level; they measure test performance, not everything that makes a school good.