The 2010 Census could help address one of the problems in dealing with San Francisco´s homeless problem — getting an accurate head count. Temporary census workers will spend three days at the end of March interviewing homeless people. The official number of homeless people matters because it can potentially affect the number of representatives for state and federal legislative representatives because they´re drawn based on population. It also impacts federal, state and city grants for social service programs for the homeless. Canadian census data currently only includes numbers of people in shelters.