I'm from Norway and I immediately thought, "Well, Toten, maybe?" — though I personally hadn't heard any incest jokes about that place.
So I looked up "Norges Alabama", and the first result was a song by that title, about Toten, whose first line and refrain translates as, "I'm going out to ride, ride my cousin".
...So I guess I've heard incest jokes about Toten now.