What is the highest number of people occupying the ISS at on time ?
Several uncrewed cargo spacecraft service the ISS , they are the Russian Progress spacecraft which has done so since 2000 , the European Automated Transfer Vehicle ( ATV ) since 2008 , the Japanese H - II Transfer Vehicle ( HTV ) since 2009 , the American Dragon spacecraft since 2012 and the American Cygnus spacecraft since 2013 .