Number of detainees under the jurisdiction of the U.S. Marshals Service and Immigration and Naturalization Service, by location of facility, Fiscal Year-end 2005. Image displays a map of the 48 contiguous states showing the number of detainees under the jurisdiction of the U.S. Marshals Service and the Immigration and Naturalization Service held in federal, state, local, and private detention facilities. Each plot-mark, depicting the number of detainees held in detention facilities within a county or county-like area, is a scaled in the range of 1 (the smallest) to 3,000 (the largest). The greatest concentration of detainees are held in facilities located in the southwestern and northeastern parts of the United States.