Alexander Hamilton Boyhood Home Study Act of 2009 - Directs the Secretary of the Interior, in consultation with the Governor of the Virgin Islands, to conduct a special resource study of Estate Grange and other sites and resources associated with Alexander Hamilton's life on St. Croix in the U.S. Virgin Islands.
Instructs the Secretary to evaluate the national significance of the sites and resources and the suitability and feasibility of designating them as a unit of the National Park System.