What about Monster Zero. We're told at one point that the aliens have got King Ghidora attacking the western hemisphere, correct?
And as far as DAM is concerned, it's stated that everyone in Tokyo took shelter as soon as Rodan arrived, so maybe the death toll wasn't that bad.
In Godzilla vs Gigan the Tokyo attack seemed like it should have come as a big surprise, unless people had time to exacuate in that instance too.
Hmm...Godzilla vs Hedora...there's a real possibility. After changing into it's flying form, Hedora certainly did a lot of traveling, and from the deaths we're actually shown I'm assuming the death toll was pretty high.