It is suggested that for social psychological theory and research on helping to provide an adequate general explanation of helping, more attention must be paid to supraindividual factors. Most studies of blood donation have failed to take into account a number of factors that may influence donations at the level of the organization, community or collectivity. This study examines the possibility that specific community norms may emerge that have an influence on the donating behavior of community members. Perceived normative support was found to exist in different degrees in communities that provide different levels of behavioral support for bloodmobile visits, and persons who report a greater degree of perceived community support for donation are more likely to have donated in the past year. Implications for donor recruitment procedures are discussed.