The School District of Clayton was accidentally omitted from the latest list by Niche.com ranking Missouri's Best School Districts. When the District discovered the error it immediately contacted Niche. A manager for the school rankings website acknowledged an internal geocoding error had excluded the District from the list and "apologized deeply" for it.

The District's grades were restored but, since the rankings had already been published, Clayton will not be assigned a numerical ranking on the 2021 list of Missouri's Best School Districts even though the corrected lists shows Clayton listed first among all school districts in Missouri. 

The School District of Clayton continues to be one of the highest-performing school districts in the State of Missouri and regionally, serving more than 2,600 students in grades PK-12.