The Orinda Union School District is at the web site below, but it's not that simple. There is no guarantee that the attendance boundaries of any of the schools are static. So if you bought a home based on it being in the attendance area of grade school A, the school district can move your child to grade school B at any time. Obviously they try not to do that, but there are no guarantees. It is a fine school district, as is Acalanes, the district for the high schools.