Keep in mind that school districts are not as cut and dried as they used to be!
Now families can choose between traditional public schools, charter schools, magnet schools, and in the case of Meridian Elementary even year round scheduled schools.
In some areas, there is also "open enrollment" which essentially means that even if your child is not in the boundary for a certain school, you might be able to provide transportation to the school if there is space available.
Also, be careful that just because you can see a school from a potential house, doesn't mean that school is the one your child might got to!
Hope that helps you realize why the lines aren't as clearly defined as you might like to see.