WW II had turned to bombing civilian targets earlier. All the european ones are quite famous (Dresden the most famous).
Earlier, over 70,000 were killed in Tokyo in just one night of conventional firebombing. Roughly the same number as that killed in Nagasaki.
Cilvilians killed in WW II. 32,327,100
Source:
http://en.wikipedia.org/wiki/World_War_II_casualties