Wasp nests

[Dewey Cox]

Now that the leaves are mostly gone, I seem to be noticing a lot of wasp nests.
This did seem to be a busy year for wasps, so the number shouldn't be surprising.
What I do find interesting is how many nests I'm seeing so close together. I am finding two or three nests within spitting distance.
Is this a normal thing I've just never noticed before?
Are you guys seeing this out on your travels?
This also makes me wonder about the theory of wasps being territorial, and hanging a fake nest to scare away wasps from your yard.