...those with symbols and those without. St. Louis has a symbol: the Fleur de Lis.
Can you think of any other cities with a symbol? Big cities? Does Denver have a symbol? What about Austin, Nashville, Portland, Seattle, LA or San Francisco? I don't think any of those places have a unique symbol. They all have flags, but are they recognized by a symbol?
What does it say about St. Louis that we have a recognized symbol and the other places that don't?
Just for grins, check out the flip side of the Oregon state flag on the link. Are they the only state with a different image on the front and back side of their state flag?