You can figure that out of a normal day, you bumping into six hundred folks (the grocery, the gas station, work, neighbors, post office, etc), that at least 30 of them are carrying a weapon.
It would be curious to know the density of the population and if more who live in urban areas do it than rural areas.
Here in Virginia, about one in twenty people have a permit. Drop minors and illegals, and that goes to about 1:16. Here in northern Virginia, there are a lot of government and private security personnel and retired military, so I’d figure it’s between 1:10-1:15, in spite of the fact that there are huge numbers of libs here.
That last bit, by the way, is a good thing to point out to my lib neighbors. They always get that deer-in-the-headlights look when I point out that one in ten men they meet every day is armed, and yet crime is pretty low here, with few public murders or robberies, especially compared with nearby DC and Maryland.