I'm sure this has been discussed to death on this board, but the 5 top-ranked US city flags are typically DC, Chicago, Denver, Phoenix, and St. Louis. Chicago and DC use the same motifs but Chicago's symmetry and color palette are superior. Personally, I prefer St. Louis' over the rest. IMO DC's asymmetry is jarring and its color palette is kind-of boring, Denver's design is too literal and kind-of clumsy (it feels like it should be hung long side parallel to the flag pole due to the orientation of the mountains), and Phoenix's is a bit too plain in terms of color and composition, though the image is well done.
Anyway, you'll see the St. Louis flag hanging all over the place in St. Louis. I've even seen a couple of (presumably) expats flying it on the east coast. Hasn't been posted here yet so...
link to image
And here's an excerpt from a nice write-up on the flag's history and symbolism from a local historian-blogger:
https://www.distilledhistory.com/stlouisflag/