The following list of countried did not participate in 2008 summer Olympic games.
205
205
Vatican City
205
France
205
104 nations
You can bet North Korea and Myanmar will not send athletes to the Olympics.
205
At London 2012, 3 countries allowed women to compete at the Olympics for the first time. These were Saudi Arabia, Qatar and Brunei.
-2 -Great Britian -France
I don't know but more than 204, because there are 204 countries in the Olympics. Not all the countries compete in the Olympics. From Helen Louise Claxton