You can't. Real estate websites like Zillow, Trulia, etc. do not have permission from school districts to list homes by school district boundaries. All purchase contracts have a clause that states it is the buyer's responsibility to verify all information about the home - including verifying the school district the home is located in.
You need to understand that the boundaries for school districts can vary from the boundaries of the town or city the home is located in. Websites like Zillow and Trulia rely on public information. School district boundaries in many locations are NOT public information so it's not available to websites. These websites get their school information from greatschools.org which is not reliable for any specific school district. Just use it as a guideline.