For copies of naturalization papers, you should contact the U.S. Immigration and Naturalization Service. It may take up to a year to obtain copies. For naturalization papers issued prior to 1930, the I.N.S. may direct you back to the county. Below are the contact information for the U.S. Immigration and County Clerks Office.

U.S. Immigration and Naturalization Service

National Customer Service Center Ph #  1-800-375-5283

Website: http://www.ice.gov or http://www.uscis.gov