During 1964, the Visitors' Service of the ICRC received some 2,500 persons.

Many of these were members of National Societies of the Red Cross, Red Crescent and the Red Lion and Sun, representing more than 50 different nations: Afghanistan, Argentina, Australia, Austria, Belgium, Brazil, Cambodia, Canada, Chile, China, Congo, Czechoslovakia, Denmark, Ethiopia, Finland, France, Germany, Great Britain, Greece, Guatemala, Hungary, India, Iran, Iraq, Italy, Japan, Korea, Lebanon, Malaysia, Mexico, the Netherlands, New Zealand, Nicaragua, Nigeria, Pakistan, Peru, the Philippines, Poland, Rumania, Sierra Leone, South Africa, Spain, Sudan, Sweden, Switzerland, the United States, Upper Volta, Uruguay, the USSR and Yugoslavia.