The United States Olympic Committee sent a total of 530 athletes.
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530
lots
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There are 529 athletes on the 2012 US Olympic team. There are 268 women and 261 men.
There are 184 athletes in the Dutch (Netherlands) olympic team
A group of Russian athletes and their support team that will travel to the UK to take part in the 2012 Olympic games.
2012 Summer Olympics: Canada = 281 (per London2012.com)
12 athletes
There are 410 athletes in the Australian Olympic team competing at the London 2012 olympics.
Five athletes were selected to the team to compete only in 3 different sports.
Of course, Romania participated to the Olympic Games of London in 2012.