The Department of Homeland Security has released its 2009 Yearbook of Immigration Statistics. Included, naturally, are statistics about international adoption to the U.S.
Of particular interest, Table 12, Immigrant Orphans Adopted by U.S. Citizens by Gender, Age, and Region and Country of Birth: Fiscal Year 2009, and Supplemental Table 4, Immigrant-Orphans Adopted by U.S. Citizens by State or Territory of Residence, Gender, and Age: Fiscal Year 2009.
At Adoption Under One Roof, AngelaW has posted some interesting charts and graphs based on the data. It's a very interesting read.