Question

What casualties did the Japanese suffer after the United States dropped two atomic bombs on Japan?

Answer 1

A Bombs dropped on Hiroshima and Nagasaki caused 120,000 and 49,000 respectively. Fighting continued to September 9th and afterwards.

Explanation:

http://www.bookofhorriblethings.com/ page 416.
There was also extensive fighting in Manchuria after the USSR entered the war against Japan.

Fighting continued through many of the Japanese occupied areas across East Asia and after the official surrender the surrender date when Japanese troops were used to maintain order is some places where no allied personnel were available.

Actual Japanese causalities would be hard to determine. Many civilian Japanese who had relocated into Manchuria evacuated or were forced out.
A Japanese solder held out in a wilderness area till the 1970s.