Aside from local ordinances, there are no laws against carrying a firearm openly in any states, is there?
No FEDERAL law. Some states forbid open carry outright, others require a license to do so.
NC has a law about carrying a firearm to the “terror of the public”. This means if any old biddy sees your weapon and gets scared, you can be charged. Was even cautioned in my CCW class to use a holster and method of concealment that won’t let anyone see I am carrying at all, otherwise the law can be applied.
Yest there are, in many states. Even in Texas you can't carry a handgun openly. You can carry a long gun, but not a handgun.
It's only recently that you could carry a handgun, concealed in your vehicle, without a permit/license. When I first moved to Texas in '77, you could not carry a loaded handgun at all. Even an unloaded one had to be locked away your trunk or otherwise be out of reach, and that was only changed, in series of changes to the law, over the past few years.
I am pretty sure that you can “Open Carry” in any state.
This was fully covered during Katrina when it was common to carry heat on a belt to even get gasoline and not have your car high jacked!