Approximately 4.2% of children in the Head Start program were homeless during the 2015-2016 school year, representing 20,647 of the total 491,595 children enrolled in the program nationally. This is nearly double the share and number of Head Start children experiencing homelessness in the 2006-2007 school year. "Homelessness" is defined as those who are literally homeless (living on streets, in cars, in shelters, or other places not meant for habitation), and those who live in "doubled-up" situations that include multiple families sharing units meant for single-family habitation. These findings were reported in "Head . . .