Estimates of the Legal Permanent Resident Population and Population Eligible to Naturalize in 2003 [open pdf - 421KB]
"This paper presents estimates of the legal permanent resident (LPR) population living in the United States and of the population eligible to naturalize updated to 2003 by year of admission for permanent residence, country of birth, and state of residence. The estimates are based primarily on a database created by the Office of Immigration Statistics (OIS) from administrative records of U.S. Citizenship and Immigration Ser-vices (USCIS) of the Department of Homeland Security. (Both OIS and USCIS were part of the former Immigration and Naturalization Service (INS).) The methodology used for the 2002 estimates (Rytina, 2004) was also used for the 2003 estimates."
U.S. Citizenship and Immigration: http://uscis.gov/