I remmeber the swarm we saw in 1985 or 1986. Growing up, our house was at the very end of a long road that ran from the highway, through a wooded area, down to the lake. With all of the trees surrounding the lake (it was Army Corps of Engineers property but we went down there anyway), they got so bad you could sweep them up into piles and burn them like leaves
I've never seen it that bad again, but any place with a lot of old trees is going to get it worse than the city and suburbs.