In Fairfax County, students MUST attend the school that serves their community unless a waiver has been petitioned for and provided. Other counties and Cities handle this in different ways, but this policy makes it very important that home 
purchasers, and renters, double check the boundaries if it is important for them to find a house within a certain school community.
Realtors provide information to the best of their ability in the MLS, but as we are all human, there are on occasional errors on the listings.
If you are looking for a home and the school is important to you, use the Fairfax County Public Schools' Boundary Information System to double check that the property feeds into the right school.
Even if your Realtor feels confident that they know the accurate information for that property, it is always a good idea to double check--things sometimes change (although not usually without a lot of discussion in Fairfax County!!).
To check the Boundaries for the property you are interested in click on the link and enter the address: Fairfax County Public Schools' Boundary Information System
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Great post Holly, if you don't mind I'm stealing your idea......... Our local district has 8 elementary schools and 3 middle schools. Their Web site has a street listing where you can figure out which school your house/listing belongs. I'm going to blog about that.
Best wishes,
Lewis
Holly, You're on the verge of an Activerain milestone... congratulations!
Great information for residents and homebuyers in your area!