Hello I agree with the other answerer you can go to chaffey joint union high school district and they have a boundaries map. I do believe your home is zoned for Etiwanda High School. Please don't hesitate to contact me if you should have any furthere questions about the area etc... I have lived in Rancho Cucamonga for over 35 years and attended the schools in Rancho as well.
@SusuLe1Twin: You can go to the Chaffey Joint Union High School District website (Google search it) and on the left there is a School Site Locator. Just click on that and you can type your address into and it will show you the school. I just learned this myself, because we are trying to find a rental in that area. Hope this helps!