How many children are in foster care in the U.S.?

463,000.

As of September 30, 2008, there are a total of 463,000 children in foster care all over the United States. This is according to preliminary 2008 data from the Adoption and Foster Care Analysis Reporting System of the U.S. Administration for Children and Families. The median age for all foster children is about 9.8, with 53% of them male.