There are two.ZimbabweZambiaSee the related link below for a full list.
65
204 nations.
Greece and United Kingdom
The Greek people and Athenians and Spartans competed in the Olympic games of Greek.
Switzerland, Great Britain and Greece
MICH JORDAN competed & won in the Olympic Games
Australia, France, Great Britain, Greece and Switzerland have competed in all of the Olympic games as of 2012.
The only real difference is the countries that are invited to participate. All countries that have a National Olympic Committee may send athletes to the Olympic Games. All countries that are members of the Commonwealth of Nations or are a territory of a member of the Commonwealth of Nations may send athletes to the Commonwealth Games. There are a few sports competed in the Commonwealth Games that are not competed in the Olympics (lawn bowls, squash, and netball). Olympic sports canoeing, sailing, and volleyball have never been competed in the Commonwealth Games.
not all countries competed but normally all contries are invited to take part
Qatar has competed in the Olympic games 8 times. The first year they competed in the Olympic Games was 1984, and they have participated in every one since then.
Lindsey Jacobellis is a snowboarder that has competed in two Olympic Games. She has won lots of Gold medals in almost every event that she competed in.