I haven't seen a trick-or-treater in the twenty years I've lived here. Sort of away from major concentrations of kids. Neighbors on the north side had kids of the right age a few years after they moved in, but they always took the kids to make the rounds with their cousins in the "old neighborhood" (which was more built-up and thus easier pickings). Once the kids on the north side outgrew the ritual, the family on the south side had kids. But ... they, too, prefer to take their kids to make the rounds with relatives and former neighbors.
I used to buy candy, and never gave any out. Now I don't even bother.