Thanks for your question. As the others have already mentioned, you can check with the Fremont Union High School District office for the actual boundaries of all of the various high schools in the area.
As someone already noted, the zip codes for Homestead High School are: 1) 94087 (West Sunnyvale); 2) 94086 (a small fingerlet that borders El Camino Real from Bernardo to Pastoria) and a portion of 3) 95014 (where the bridge across the freeway meets Mary Avenue on the Cupertino side of the community and the area around the bridge to Hollenbeck).
Cupertino High School's boundaries include zip code: 1) 95014; 2) 95051 (the section of Santa Clara bordering Stevens Creek and 3) 95129, that section of San Jose along Stevens Creek from Lawrence up to almost Saratoga and then from Saratoga near Moorpark)
Remember, however, that Fremont High School also shares 94087, 95014, and 94086, and Cupertino High shares its zip codes with surrounding schools too including the HS in Santa clara, so it's very important to consult the district boundary map if going to a specific school is very important to you.
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My advice is to work with an agent who can provide specific information or searches that focus on those schools (elementary, middle and high) that you prefer. Keep in mind that even if you're located in an attendance area, there may not be any space available in the school(s)! In that case, you go on a waiting list until a space opens up. That is call an "impacted" school.
The other link to consider using when you get to a specific property is http://www.schvision.com/schoolfinder3/fuhsd/ With this site, you enter the actual address to determine the school set. This is more accurate than the first link as it is more specific.
If you would like to discuss an easier way to search for a home with particular schools, please don't hesitate to give me a call.
Cupertino High School
95129 West San Jose
95051 Santa Clara
Homestead High School
For boundary maps to CUSD and FUHSD with all API scores to south bay schools check out my blog at http://bayareaconnect.com/school-search/ weekly market reports can be found here http://bayareaconnect.com/23/04/2012/cupertino-95014-west-sa
Call me with any more questions at (408) 840-3852 or shoot me an email at Thomas.Feng@gmail.com
Eric & Janelle