https://www.news-leader.com/story/news/politics/2020/12/07/covid-missouri-where-face-mask-mandates-by-county/3790488001/
There is not a population center in the state that does not have a mandate.
KC, STL, Springfield, Joplin, Columbia, Kirksville, Cape and numerous counties have mandates. Where exactly in Missouri can you go without one. Completely rural areas maybe, but nowhere with any population to speak of.