Switzerland competed at the 2000 Summer Olympics in Sydney, Australia. 102 competitors, 64 men and 38 women, took part in 82 events in 19 sports.
Spain competed at the 2000 Summer Olympics in Sydney, Australia. 321 competitors, 216 men and 105 women, took part in 165 events in 27 sports.
Colombia competed at the 2000 Summer Olympics in Sydney, Australia. Colombia won its first ever gold medal at these Olympic games. 44 competitors, 25 men and 19 women, took part in 45 events in 13 sports.
Costa Rica competed at the 2000 Summer Olympics in Sydney, Australia.
Portugal competed at the 2000 Summer Olympics in Sydney, Australia.
The Philippines competed at the 2000 Summer Olympics in Sydney, Australia. This is the first time the Philippines failed to garner at least one medal in the Olympics since 1988.
Ireland competed at the 2000 Summer Olympics in Sydney, Australia.
Malta competed at the 2000 Summer Olympics in Sydney, Australia.
Sri Lanka competed at the 2000 Summer Olympics in Sydney, Australia. The nation won its first Olympic medal since 1948. Sri Lanka has sent their ever largest number of competitors (18) for an Olympic game in this event.
Thailand competed at the 2000 Summer Olympics in Sydney, Australia.
Vietnam competed at the 2000 Summer Olympics in Sydney, Australia. Vietnam was represented by seven athletes in four sports, and won their first Olympic medal.
Kyrgyzstan competed at the 2000 Summer Olympics in Sydney, Australia. Kyrgyzstan won their first Olympic medal at these games. 48 competitors, 35 men and 13 women, took part in 59 events in 9 sports.
Ecuador competed at the 1996 Summer Olympics in Atlanta, United States, winning its first Olympic medal when Jefferson Pérez won the gold medal in the men's 20 km walk. This was the nation's eighth consecutive appearance at the Olympics, since it first started competing in the Olympics, at the 1924 Summer Games in Paris.
Grenada competed at the 2000 Summer Olympics in Sydney, Australia with two track and field athletes and one swimmer.
Laos competed at the 2000 Summer Olympics in Sydney, Australia.
Mongolia competed at the 2000 Summer Olympics in Sydney, Australia.
Nepal competed at the 2000 Summer Olympics in Sydney, Australia.
Papua New Guinea competed at the 2000 Summer Olympics in Sydney, Australia.
Qatar competed at the 2000 Summer Olympics in Sydney, Australia.
The United Arab Emirates competed at the 2000 Summer Olympics in Sydney, Australia.
