Somalia
There are many counties with only one participant.
Some athletes have dual citizenship and will compete for the country in which they can make the Olympic team.
IOA - Independent Olympic Athletes
In the opening ceremony, the athletes from the host country enter last. In the closing ceremony, the athletes enter en masse and there is no structure as to what country's athletes enter last.
spain
The country with the most athletes is Great Britain with 558 athletes.The country with the second most athletes is the United States of America, with 529 athletes.The country with the third most athletes is Russia with 448 athletes.
That country would be boycotting the event.
Great Britain
LeU SofAwhoot whoot!
Any country that has athletes that are good enough to compete in Olympic sports.
the host country creates what is called "The Olympic Village" in which only athletes and coaches are allowed to stay in.