there are 30 athletes competing in the London 2012 games.
There will be 75 athletes competing for Jamaicia
Only 103 athletes from Romania at London 2012 Olympics; see the link below for many details.
Over 10,000 athletes from 204 countries will be competing in the 302 events for the 2012 London Summer Olympics
There were 277 Canadian athletes competing at the Summer Olympic Games in London 2012. The official London 2012 site, however, has 281 athletes listed throughout all sports.
530 US athletes will be participating at the 2012 London Olympics.
89
Over 10,000
about 400
7
400
Of course, Romania participated to the Olympic Games of London in 2012.