Missouri: Columbia for sure
Utah: Hard to say. Pretty much anywhere east of State Street and north of I-80 in Salt Lake City could probably work. I have never seen so many political signs in my life as I did driving on 1500 East in SLC in October 2020. It was wall-to-wall Biden signs on almost every house, along with lots of other liberal signs (BLM, "in this house we believe..." and so on).
The Central West End in St. Louis has to be in the running for Missouri. When I attempted a calculation of the White vote by precinct, it was the largest blob where Whites were above 80% Clinton.
Wouldn't it make more sense to treat University City as the wokest place in Missouri? Much of the white population is Jewish, and the city is a great demonstration of a place where blacks and Jews get along with each other quite well.