United States and China
It varies but, 10,568 competed at the London 2012 Summer Olympic Games and about 2,800 athletes are expected to compete at the 2014 Winter Olympics.
According to the United States Olympic Committee, the US sent 613 athletes to compete in the 2004 Summer Olympic Games in Athens and 211 athletes to compete in the 2006 Winter Olympic Games in Turin.
Yes. The Olympic Games include the Summer and Winter Olympic Games. Summer Olympic Games is said to separate it from the Winter Olympic Games.
10,625 athletes participated in the 2004 Summer Olympics in Athens. 2,508 athletes participated in the 2006 Winter Olympics in Turin.
258 athletes competed in the 1924 Winter Olympics.