..and Wikipedia says...
//The 2012 Games in London increased this record to 206 nations, even though only 204 NOCs (National Olympic Committees) were represented.[40] Brunei returned to the Games, but athletes from the former Netherlands Antilles competed as Independent Olympic Athletes, after the Netherlands Antilles Olympic Committee's membership in the IOC was withdrawn in 2011 as a consequence of the dissolution of the Caribbean country. One athlete from South Sudan also competed as an independent athlete, since the nation had not yet formed a National Olympic Committee after its independence in 2011.