Your best bet is to call the school district's office of the city you live in. You will provide your stress address, and they will be able to share the name and location of your child's elementary school. Amazingly, the school boundaries are pretty complicated (not exactly a series of straight lines!), so it is very difficult to know which school you are officially "assigned" unless you contact the district office.
You can find the contact information for your school district by searching here: http://www.education.com/schoolfinder/ and including the term, "unified school district", or you can do a search on the web.
L. Compian, Ph.D.