Naturalization Certificate Number Lookup provides access to the United States Citizenship and Immigration Services (USCIS) duplicate copies of naturalization court filings from September 27 1906 through March 31 1956. These documents are stored as Certificate Files (C‑Files) at the National Archives in Washington, D.C. Researchers request a specific C‑File by completing Standard Form 330, supplying the applicant’s full name, approximate filing date, and, when known, the original court location. The red eight‑character number printed in the top‑right corner of each certificate links the paper record to its electronic catalog entry and is required for FOIA or certified‑copy requests.
The Certificate Series Numbers system groups these C‑Files by judicial district, time period, and naturalization method, including a separate “A‑” series for WWII military service naturalizations abroad. Each series corresponds to microfilm reels identified by NAID numbers, such as San Diego Superior Court reels (NAID 7560873) and Los Angeles reels (NAID 7821340), which can be ordered through the Archives’ online catalog or accessed at regional facilities. Using the red certificate number as a primary key streamlines genealogy research, immigration paperwork, and benefit verification by directly retrieving the original court record.
Naturalization Records | National Archives
The United States Citizenship and Immigration Services (USCIS) preserves duplicate copies of every naturalization court filing that occurred between September 27 1906 and March 31 1956. These copies are organized in the Certificate Files, commonly referred to as C‑Files, and are stored at the National Archives in Washington, D.C. Researchers can request access to a specific C‑File by submitting a Standard Form 330 to the National Archives’ Genealogy Branch; the request must include the individual’s full name, approximate filing date, and, if known, the original court location. Starting on April 1 1956, the Immigration and Naturalization Service (INS) transitioned all new naturalizations to the Alien File (A‑File) system, which records both the certificate and the underlying immigration documentation in a single file.
https://www.archives.gov/research/immigration/naturalization 
Certificate of Naturalization Number Explained | CitizenPath
The Certificate of Naturalization number typically consists of eight characters that combine letters and digits. Since September 27 1906, USCIS has printed this identifier in bright red ink on the upper‑right corner of each certificate, making it easily distinguishable from other printed information. For certificates issued before that date, the number may appear in a different area—often on the lower‑left side of the document or within the body text—depending on the state court’s formatting practices. The red number, also known as the C‑file number, is essential for locating the original filing in the National Archives’ electronic catalog or for requesting a certified copy through a Freedom of Information Act (FOIA) request.
https://citizenpath.com/faq/certificate-of-naturalization-number/ 
Certificate Series Numbers | USCIS
The Certificate Series Numbers system groups naturalization records by the judicial district, time period, and method of naturalization. It encompasses every court‑handled naturalization filed in all U.S. states, territories, and the District of Columbia from September 27 1906 through March 31 1956. Additionally, the series includes files for individuals who were naturalized abroad while serving in the United States Armed Forces during World War II, identified by a distinct series code beginning with “A‑.” Each series number corresponds to a specific set of microfilm reels, which are cataloged with NAID identifiers and can be accessed through the National Archives’ online microfilm database or by visiting a regional archives facility.
https://www.uscis.gov/records/genealogy/historical-record-series/certificate-series-numbers 
How Do I Find My Certificate of Naturalization Number?
The naturalization number is a critical reference that appears in red ink on the top‑right corner of your Certificate of Naturalization. This number connects the printed certificate to the underlying court file and is required when requesting a certified copy, submitting immigration paperwork, or conducting genealogical research. Knowing the exact number also helps differentiate your certificate from other documents that may contain similar identifiers, such as USCIS Registration Numbers or petition numbers.
The certificate also records the name you used at the time of naturalization, the residential address listed on the oath, marital status, country of former citizenship, date of birth, gender, height, a passport‑style photograph, and the official issue date stamped by the issuing court. These details together create a profile that immigration officials use to verify citizenship status and eligibility for benefits. The red naturalization number is the primary key used by the National Archives and USCIS databases to retrieve the original court record.
https://legalbeagle.com/7519052-certificate-naturalization-number.html 
What’s My Naturalization Certificate Number and Date and Place … – Nolo
The certificate number is located at the top right‑hand side of the document and is printed in a striking red ink that contrasts with the black text of the rest of the page. It is important not to confuse this number with other numeric identifiers that appear elsewhere on the certificate, such as the USCIS Registration Number, CIS Registration Number, Application Number, or Petition Number, each of which serves a different administrative purpose. For example, the USCIS Registration Number typically begins with “RN” and is used for case tracking, whereas the naturalization certificate number is a unique eight‑character code that directly ties the certificate to its original court file.
https://www.nolo.com/legal-encyclopedia/whats-naturalization-certificate-date-place-issuance.html
How to Find Naturalization Records: 11 Steps (with Pictures) – wikiHow
To locate pre‑1906 naturalization documents, begin by visiting the National Archives’ dedicated naturalization research page, which provides a searchable index of microfilm collections and a guide to the physical locations of relevant holdings. Only a limited number of early naturalization records have been digitized; most remain on microfilm reels stored at the National Archives facilities in Washington, D.C., College Park, MD, and regional branches. Researchers can request copies by completing the “Request for Access to Archival Records” form and providing the individual’s name, approximate filing date, and the jurisdiction of the naturalization court. After the request is processed, the archives will deliver a digital image of the microfilm or arrange an in‑person viewing appointment.
https://www.wikihow.com/Find-Naturalization-Records 
Naturalization Records | New York State Archives
The New York State Archives offers a “Naturalization Pathfinder” tool that guides researchers to the most appropriate repositories for naturalization documents ranging from the colonial era to the present day. The Pathfinder cross‑references the applicant’s year of arrival, the county where the oath was taken, and the type of naturalization (court‑based, legislative, or military). The archive also provides a “Naturalization Leaflet,” which outlines relevant state statutes, federal laws, and historical context for each period, helping users understand why certain records appear in specific courthouses or state agencies.
http://www.archives.nysed.gov/research/naturalization-records 
Naturalization Records on Microfilm | National Archives
The National Archives holds extensive microfilm collections of naturalization records from California and Washington State courts. Notable holdings include the Superior Court of San Diego County records from 1883‑1958, comprising nineteen reels cataloged under NAID 7560873 (microfilm series M1614), and the Superior Court of Los Angeles County records from 1876‑1915, spanning twenty‑eight reels with NAID 7821340. Washington State’s naturalization rolls are indexed under microfilm series M1233. Researchers can order copies of specific reels by referencing the NAID numbers on the National Archives’ online ordering system or by contacting the archives’ Genealogy Branch directly.
https://www.archives.gov/research/immigration/naturalization/microfilm 
Researching Individuals | USCIS
The types of records you can locate depend on when the immigrant entered the United States and whether they completed naturalization before or after key legislative milestones. For arrivals before 1924, investigators can consult passenger arrival lists, border crossing cards, and early naturalization court files. For individuals who arrived between 1924 and approximately 1944, researchers should examine the Alien Registration Number (A‑Number) files, which may include draft registration cards and later naturalization petitions. Special attention is required for immigrants who arrived before August 1940 but were not naturalized by that date, as their records may be split between immigration and naturalization archives.
U.S., Naturalization Records Indexes, 1794-1995 – Ancestry.com
The Ancestry.com Naturalization Index compiles essential data such as the applicant’s full name, the certificate number (when available), and the volume and page where the original record is stored. This index enables genealogists to draft a precise request to the National Archives, specifying the volume and page to retrieve a certified copy of the original naturalization certificate. When submitting a copy request, include the indexed information, a self‑addressed stamped envelope, and the appropriate processing fee. Copies are mailed from the National Archives facility indicated in the index entry.
https://www.ancestry.com/search/collections/1192/ 
Where do I find my citizenship number? | US Immigration forms
The citizenship number is printed in red ink at the very top of every Certificate of Naturalization and Certificate of Citizenship. It is a nine‑digit identifier that begins with the letters “CN” followed by seven numbers (e.g., CN 1234567). In addition to the primary certificate, the same citizenship number may appear on related documents such as naturalization oath transcripts or the naturalization petition filed with the district court. When reviewing other immigration records, look for the “CN” prefix to ensure you are referencing the correct citizenship identifier.
https://usimmigrationforms.com/where-do-i-find-my-citizenship-number/ 
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