204 nations were invited to come. Two nations are competing under the olympic flag, they are counted as one in the nation count.
I believe 204
204 nations or National Olympic Committees (NOCs) participated in the 2012 London Olympics.
Sixty (60) countries participated in the taekwondo events at the 2004 Olympic Games in Athens, and sixty-four (64) countries participated in the taekwondo events at the 2008 Olympic Games in Beijing.
204 Countries participated in the 2008 Beijing Summer Olympic games.
In the 1980 Olympic Games in Moscow, there were 90 countries that participated. The United States boycotted the games that year.