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204 nations competed and are listed on related link
10,820 athletes from 204 countries competed in the 2012 London Olympics.
Jamaica competed at the 2012 Summer Olympics with 50 athletes in 4 sports
Sweden competed at the 2012 Summer Olympics in London with 134 athletes in 20 sports
Softball and baseball were competed at the 2008 Summer Games but will not be competed at the 2012 Summer Games. They will not be replaced so the 2012 Games will have 26 sports where the 2008 Games had 28.
Luke Thomas Michael Hall is a Swazi swimmer who competed at the 2008 Summer Olympics and the 2012 Summer Olympics. He placed fourth in his heat.
all of them
Athletes from over 200 different countries will be participating in the 2012 summer Olympics
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