Old county school records are available at most courthouses in the state of Missouri. They can vary greatly in the information they give, and what years are available, but it is certainly worth looking into them. The records that contain the parents names and the addresses are private under the 72 year rule. Below is a finding aid (listing) of the records that were available in Buchanan County. This was made in 2003, so since then more records have become public, but this is a good document to give you an idea of what may be available.
If you would like the NWMGS to research and access the original records, please email us.