I searched for this, but came up empty. I have gone through MO's ccw laws and the reciprocity stuff, but I'm being told that St. Louis county is different. Do they have their own ordinances for non resident ccw holders? Thanks!
No, they don't. School zones would be the only restriction for nonresidents anywhere in MO due to the GFSZA.
There used to be open carry restrictions in St Louis County that varied by jurisdiction, but those were legislatively preempted last year by the state.
MO recognizes all states permits.
(a) Any person with a valid concealed carry endorsement or permit who is open carrying a firearm shall be required to have a valid concealed carry endorsement or permit from this state, or a permit from another state that is recognized by this state, in his or her possession at all times;