Many schools, businesses, churches, and associations in the St. Louis area maintain archives that are open to the public.
Speaking with an archivist or librarian at the site is always the best way to start.
Not all archives have inventories of their collections listed online, and smaller archives may not even have a website.
Always contact the organization BEFORE visiting, as often appointments are required.
NOTE: Several local archives have very similar names, which can be confusing
The Missouri Historical Society (MHS) and the State Historical Society of Missouri (SHSMO).
These organizations are separate from the Missouri State Archives (MSA)
While located within larger public libraries, hours and access policies for their specialty departments vary.