Sierra Leone competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. This was the nation's eighth appearance at the Summer Olympics since its debut in the 1968 Summer Olympics. The Sierra Leone delegation included two track and field athletes; Lamin Tucker and Hawanatu Bangura, both of whom were sprinters that were selected via winning an event in Freetown, as the nation had no athletes that met the "A" or "B" standards in any event. Bangura was selected as flag bearer for the opening ceremony. Neither of the two athletes progressed beyond the heats.
Saint Kitts and Nevis took part in the 2004 Summer Olympics, which were held in Athens, Greece, from August 13 to 29. The country's participation at Athens marked its third appearance at the Summer Olympics. The delegation included two track and field athletes: Kim Collins in the men's 100 meters, and Tiandra Ponteen in the women's 400 meters.
Chile competed at the 2000 Summer Olympics in Sydney, Australia. 50 competitors, 43 men and 7 women, took part in 28 events in 14 sports.
Australia competed at the 1948 Summer Olympics in London, England. 75 competitors, 66 men and 9 women, took part in 52 events in 11 sports. Australian athletes have competed in every Summer Olympic Games.
Australia competed at the 1936 Summer Olympics in Berlin, Germany. 32 competitors, 28 men and 4 women, took part in 26 events in 7 sports. Australian athletes have competed in every Summer Olympic Games. In terms of medals won Berlin 1936 was Australia's poorest result at the Summer Olympics, winning just a single bronze in the Men's triple jump.
Argentina at the 1948 Summer Olympics in London, England was the nation's eighth appearance out of eleven editions of the Summer Olympic Games. Argentina sent to the 1948 Summer Olympics its fifth national team, under the auspices of the Argentine Olympic Committee of 199 athletes who competed in 101 events in 16 sports. It would not be until the 2016 Summer Olympics that the athlete delegation were surpassed. The medals haul of 3 golds, 3 silvers, and a bronze tied the medals haul in 1928. The achievement of 7 medals in an edition of the Olympics has yet to be matched.
The Czech Republic competed at the 1996 Summer Olympics in Atlanta, United States. It was the first Summer Games since the dissolution of Czechoslovakia, and so the Czech Republic and Slovakia competed as independent teams. 115 competitors, 76 men and 39 women, took part in 110 events in 17 sports.
Athletes from Yugoslavia competed at the 1964 Summer Olympics in Tokyo, Japan. This was the country's 10th appearance in the Summer Olympics. Yugoslavia's delegation had 75 competitors, who took part in 32 events in 9 sports.
Syria competed at the 1972 Summer Olympics in Munich, West Germany. Five competitors, four men and one woman, took part in four events in three sports.
Malaysia competed at the 1992 Summer Olympics in Barcelona, Spain. 26 competitors, all men, took part in 11 events in 6 sports. The nation won its first ever Olympic medal at these Games.
Mexico competed at the 1956 Summer Olympics in Melbourne, Australia. 24 competitors, 21 men and 3 women, took part in 20 events in 10 sports.
Pakistan competed in the Summer Olympic Games for the first time at the 1948 Summer Olympics in Wembley Park, London, England. 35 competitors, all men, took part in 20 events in 6 sports.
Malaysia competed at the 1976 Summer Olympics in Montreal, Quebec, Canada. 23 competitors, all men, took part in 9 events in 5 sports.
Indonesia competed at the 1956 Summer Olympics in Melbourne, Australia. 30 competitors, 28 men and 2 women, took part in 11 events in 6 sports.
The Federation of Malaya competed at the 1960 Summer Olympics in Rome, Italy. Nine competitors, all men, took part in eleven events in four sports. It was the second Olympic appearance by the nation, which expanded and was renamed as Malaysia in 1963.
Malaysia competed at the 1964 Summer Olympics in Tokyo, Japan. It was the first time that the Federation had competed under that name, as it was previously named Malaya, while North Borneo and Singapore had sent separate teams to the Games. 62 competitors, 58 men and 4 women, took part in 49 events in 10 sports.
Malaysia competed at the 1984 Summer Olympics in Los Angeles, United States. The nation returned to the Olympic Games after participating in the American-led boycott of the 1980 Summer Olympics. Twenty-one competitors, twenty men and one woman, took part in twelve events in five sports.
Mauritania competed at the 2008 Summer Olympics which was held in Beijing, China. The country's participation at Beijing marked its seventh appearance in the Summer Olympics since its debut in the 1984 Summer Olympics. The delegation included two track and field athletes, Souleymane Ould Chebal and Bounkou Camara, who were both selected by wildcards after both failed to meet either the "A" or "B" qualifying standards. Chebal was selected as the flag bearer for the opening ceremony. Neither of the Mauritanians progressed beyond the heats.
Chad competed at the 2012 Summer Olympics in London, which was held from 27 July to 12 August 2012. This marked the nation's eleventh appearance at the Summer Olympics since its debut in the 1964 Summer Olympics. The Chadian delegation included track and field athlete Hinikissia Ndikert and judoka Carine Ngarlemdana. Ngarlemdana was the flag bearer for the opening ceremony and Ndikert was the flag bearer for the closing ceremony. Neither of Chad's athletes progressed beyond the first round of their events. Chad was one of only two countries to have a female-only team at the 2012 games.
The African island nation of São Tomé and Príncipe competed at the 2012 Summer Olympics in London, held from 27 July to 12 August 2012. This was the nation's fifth appearance at the Olympics since its debut in 1996. Two track and field athletes, Christopher Lima da Costa and Lecabela Quaresma were selected to the team by wildcard places, without having qualified at any sporting event. Quaresma was selected as flag bearer for the opening and closing ceremonies. Neither of the two athletes progressed beyond the first round of their respective events.