Here is the list of the current participating countries at the Commonwealth Games. See also the list of past participating countries and territories, and maybe some that may participate in the future.
Although the Commonwealth of Nations is primarily a group of countries with links to the British Empire, there are a few countries that have joined recently with no historical links, such as Rwanda, Mozambique, Togo and Gabon.
The abbreviation used at the Games is listed next to the country name. Follow the links for information specific to that country at the Commonwealth Games. (see also the same list sorted by region)