North Dakota Naturalization and Citizenship
Naturalization records have been filed in the county and district courts of the state. You can write to the clerk of the court and request a search of indexes to certificates of arrival, declarations, petitions, and final naturalization papers. Due to population changes, the jurisdictions of the courts have varied from time to time. The Family History Library has not acquired these records for North Dakota.
For naturalization records after September 1906, contact the National Archives and Records Administration—Rocky Mountain Region or the local office of the Immigration and Naturalization Service.
The National Archives—Central Plains Region (Kansas City) has a few of the U.S. District Court records from 1892 to 1906.