District of Columbia Naturalization and Citizenship
Naturalization records have been filed in the county and district courts. Early circuit court naturalizations have been published in the National Genealogical Society Quarterly, Volumes 41-45 (FHL book 973 B2ng; film 001289 has Volumes 42-43).
The National Archives has district court naturalization records from 1802 to 1906. Most of the documents are declarations of intention or orders of admission. They are indexed to 1909. You can write to the National Archives for further information. The Family History Library has not acquired naturalization records for the District of Columbia.
For naturalization records after September 1906, contact the Immigration and Naturalization Service in Washington, DC. at http://www.archives.gov/research/guide-fed-records/groups/085.html.