Naturalization records are files containing information about a foreign-born person's process of gaining U.S. citizenship. The information contained in naturalization records may vary based on the federal laws under which a person becomes a citizen, as stated by U.S. Citizenship and Immigration Services.
Naturalization records contain an immigrant's country of origin, oath of allegiance, date of acquired citizenship and, if available, date of entry into the United States. Some records contain other basic data, including family and employment status. Because naturalization often occurred in county courts and municipalities in which file storage capabilities were limited, many naturalization records no longer exist as of 2015, according to the National Archives.