Spain and Sweden are the next largest, both with 14, followed by Australia and Portugal, each with 13.
Croatia and Germany have 12 sailors racing, while Denmark, Finland, Greece, Italy and Netherlands all have 11. Russia has 10.
At the other end of the scale, 12 NOCs each have just one sailor competing at London 2012. They are Chinese Taipei, the Cook Islands, Egypt, Kyrgyzstan, Malaysia, Monaco, Montenegro, Peru, Saint Lucia, Trinidad and Tobago, and Tunisia.
Find out more on each nation here.