This U.S. Department of Homeland Security (DHS) Office of Immigration Statistics fact sheet discusses the dynamics of increased immigration to certain metropolitan areas. "In recent years, a small group of major metropolitan areas has received most of the nation's new immigrants. While cities such as New York and Los Angeles remain popular destinations for immigrants, some of the greatest increases in the immigrant population now occur in cities located in the South and West. This Office of Immigration Statistics Fact Sheet provides information on leading metropolitan destinations of immigrants ranked by immigrant population growth rates and selected economic and social indicators."
Department of Homeland Security: http://www.dhs.gov/