The two easiest things to do are (1) ask a neighbor with elementary school-aged kids and (2) call the office at the nearest elementary school. If they can't tell you the answer to your question, the will tell you where to call next.
Enter your zipcode into education.com's "SchoolFinder" application (link below) and you'll get a list of schools in your area. On the search results page will be a list of nearby school districts, just under the map. Click the first one and you'll be taken to a page that has information about that school district including, if available, a phone number. Call them, too.
The district's website may also offer the information you need. For instance, our school district's website has an application that enables residents to enter their address to identify the school they are zoned for. Perhaps your district has something similar.