I live in Nevada, Ohio. Have lived there for about 20 years.
I have heard a weird hum there at nite for as long as I can remember.
I have Tinnitus but the hum is NOT a part of this.
I only hear the hum when I'm home and no one else can hear it.
I travel all over the U.S.A. and don't recall hearing it anywhere else.
I take Excedrin PM's at home just to sleep through the nite because of this hum.
It's also the reason I prefer to travel for my living. Just to get away from it!