I have heard many different things, but depending on what you define as a bomb-related casualty, the answer can range all the way from 70,000 to 200,000+ and climbing. frightening, really. mine is not a completely definitive answer, so feel free to question it.
The two cities of Japan which were hit by the atomic bomb by America were "NAGASAKI" and "HIROSHIMA".
In Hiroshima and Nagasaki, Japan.
Hiroshima and Nagasaki
See atomic bombings of Hiroshima and Nagasaki
See: Atomic bombings of Hiroshima and Nagasaki
Hiroshima and Nagasaki.
Hiroshima & Nagasaki.
They were dropped on Hiroshima and Nagasaki.
No Prefectures got blown up, the bombs weren't that powerful. Just the two cities of Hiroshima and Nagasaki. Hiroshima is contained within the Hiroshima Prefecture on Honshu island. Nagasaki is contained within the Nagasaki Prefecture on Kyushu island.
See website: Atomic bombings of Hiroshima and Nagasaki.
August 1945 I think it was the 6th Hiroshima & 8th Nagasaki
See: Atomic bombings of Hiroshima and Nagasaki