You can find most U.S. immigration records for free online through FamilySearch, the Ellis Island and Castle Garden passenger databases, and the National Archives Catalog, which together cover ship manifests, border crossings, and naturalization indexes from about 1820 through the mid-twentieth century. For records too recent for those collections, you’ll need to file a FOIA request with USCIS or pay the USCIS Genealogy Program — those routes aren’t free, but they’re the only way to reach files still held by the agency.
What to Gather Before You Start
Every search runs on the same handful of details: the person’s full original name, an approximate birth year, and country of origin. Spelling matters less than you’d expect. Port officials recorded names phonetically, so having alternate spellings and nicknames ready will save time. A rough arrival year and port of entry narrow the search dramatically, turning thousands of hits into a handful.
One rule catches researchers off guard. If the person was born fewer than 100 years ago, USCIS presumes they’re still alive and won’t release records without proof of death. Acceptable proof includes a death certificate, published obituary, gravestone photo, or documentation of death benefit payments.1eCFR. 8 CFR Part 103 Subpart D – Availability of Records For anyone born more than 100 years ago, the agency treats the person as deceased automatically.
FamilySearch
FamilySearch runs the broadest free collection online. It hosts digitized ship manifests, naturalization petitions, border crossing cards, and alien case file indexes from the early 1800s through the mid-twentieth century, and you can browse scanned images of the actual handwritten documents rather than transcriptions alone.2FamilySearch. United States Immigration Online Genealogy Records Notable free collections include an index to passenger arrivals at Atlantic and Gulf ports from 1820 to 1874, New England passenger and crew lists from 1911 to 1954, and an index to alien case files from 1940 to 2003. FamilySearch also carries Canadian and Mexican border crossing records that most other free databases skip.
Ellis Island and Castle Garden
The Statue of Liberty-Ellis Island Foundation maintains a passenger search covering arrivals at the Port of New York from 1820 to 1957, roughly 65 million records.3Statue of Liberty & Ellis Island Foundation. Passenger Search That range is wider than the Ellis Island era alone (1892–1954); it also picks up earlier arrivals through Castle Garden, which processed immigrants in lower Manhattan from 1830 to 1892. Many records include name, age, ship, nationality, birthplace, occupation, last overseas residence, and final destination. Some even note how much money the passenger carried.
The Battery Conservancy runs a separate Castle Garden database at CastleGarden.org focused on the 10 million people who arrived before Ellis Island opened. If your ancestor arrived in New York before 1892, check both. The transcriptions don’t always match.
The National Archives Online and In Person
The National Archives holds the largest federal collection of immigration records, covering arrivals from about 1820 through December 1982, with gaps.4National Archives. Immigrant Records The National Archives Catalog has replaced older finding aids as the main online search tool. You can search by name, date, or record group to locate a specific microfilm roll or digital file, then view digitized versions online or order copies.5National Archives. Passenger Arrival Records
Every NARA research room, including regional facilities and Presidential Libraries, offers free in-person access to Ancestry.com and Fold3.com.4National Archives. Immigrant Records This is one of the most underused free resources in the country. A manifest that would sit behind a paid Ancestry subscription at home is free to pull up at any NARA location.
One boundary worth knowing: Alien Files (A-Files) reach NARA only 100 years after the immigrant’s birth year. As of mid-2025, files for individuals born in 1925 or earlier have been transferred, with significant gaps.6National Archives. Alien Files (A-Files) If your ancestor was born after 1925, their A-File is still with USCIS.
Land Border Crossings
Not everyone arrived by ship, and researchers often overlook land entries entirely. Mexican border crossing records at the National Archives cover roughly 1903 through 1955 and document entries at land ports along the southern border.7National Archives. Mexican Border Crossing Records Crossings after 1955 were not retained by NARA and must be requested from USCIS.
Canadian border records are more fragmented but span a wider period, with the bulk falling between 1895 and 1954.8National Archives. National Archives Microfilm Publications Relating to Canadian Admissions and Border Crossings Major collections include the St. Albans, Vermont, district records covering land entries from Maine through North Dakota, Detroit manifests with over a million entries, and records from stations in Michigan, Minnesota, and Montana. Many are digitized and searchable for free on FamilySearch.2FamilySearch. United States Immigration Online Genealogy Records
Local Courts for Pre-1906 Naturalizations
Before September 27, 1906, any court of record could grant citizenship. Municipal, county, state, and federal courts all had the authority, and most people went to whichever was closest.9National Archives. Naturalization Records The result: pre-1906 naturalization records sit in thousands of local courthouses rather than one central archive, and NARA generally does not hold them.
County court naturalization records are public and can usually be viewed for free at the local courthouse or state archives. If you know where your ancestor settled, start with the clerk of court in that county. Local historical societies and public libraries with genealogy collections sometimes hold microfilm copies or their own indexes. These records typically list country of origin, date of arrival, and witnesses.
Religious archives fill another gap. Parish registers, baptismal records, and marriage certificates from immigrant congregations often recorded birthplace and approximate arrival date. When a government manifest is missing or illegible, a church record can confirm someone was present in a community at a specific time. Contact the individual church or the denomination’s central archives.
When Free Won’t Work: FOIA and the USCIS Genealogy Program
For records too recent for NARA or the free databases, USCIS still holds the file, and you have two paid routes.
FOIA Request
Under 5 U.S.C. § 552, you can request federal agency records including immigration files.10Office of the Law Revision Counsel. 5 USC 552 – Public Information; Agency Rules, Opinions, Orders, Records, and Proceedings The fastest way to file with USCIS is online through the FIRST portal at uscis.gov/foia. You can also mail Form G-639, though online filing responds faster and includes a tracking dashboard.11U.S. Citizenship and Immigration Services. Form G-639, Freedom of Information/Privacy Act Request Form G-639 does not cover naturalization records created before September 27, 1906 (contact the local court where naturalization occurred) or manifest arrivals before December 1982 (those are at the National Archives).
FOIA requests aren’t always free, but they often are. Most individual genealogical researchers fall into the “all other requesters” category, which means no charge for the first two hours of search time or the first 100 pages of duplication.12DHS. FOIA Fee Structure and Waivers For a straightforward personal history request, that’s often enough to cover the whole file at no cost. Complex requests may trigger fees, and fee waivers apply only when disclosure serves a significant public interest, not simply because the request is personal.
Processing times vary. Simple requests can come back in days; complex ones involving third-party privacy reviews may take many months. The agency redacts information about living third parties before release.
USCIS Genealogy Program
The USCIS Genealogy Program was built for family researchers, and it is not free. Both the index search (Form G-1041) and the record request (Form G-1041A) cost $80 each, so identifying a record and then getting a copy runs $160 total.13eCFR. Part 106 – USCIS Fee Schedule
The program works in two steps. If you don’t already have a file number, submit an index search; USCIS returns citations for all the immigrant’s files it can locate.14U.S. Citizenship and Immigration Services. Record Requests Frequently Asked Questions Then submit a separate record request using the case ID. If the index search finds nothing, the $80 search fee is nonrefundable. If the index locates a file but the retrieval step can’t find the actual record, the $80 record request fee is refunded.13eCFR. Part 106 – USCIS Fee Schedule
When the file involves someone who died less than 100 years ago and contains information about living third parties, USCIS processes it under FOIA privacy rules before release, which adds time. If everyone in the file is confirmed deceased, records are released without that review. Orders and status checks run through uscis.gov/records/genealogy.15U.S. Citizenship and Immigration Services. Genealogy
For a G-1041 index search, have the person’s full name, date of birth (exact or estimated), and place of birth including town, province, and country.16U.S. Citizenship and Immigration Services. Form G-1041, Genealogy Index Search Request For a G-639 FOIA request, also gather any file or receipt numbers from prior immigration interactions and the port of entry.
Social Security Applications as a Backup
When other records come up empty, the original application for a Social Security number (Form SS-5) can rescue a stalled search. The application asked for full name, date and place of birth, parents’ names, and employer at the time of application, and any of those details can confirm immigration data or point to the right ship manifest.17Social Security Administration. Can You Provide a Copy of a Deceased Person’s Social Security Number Application for Genealogical Research?
SSA will provide either a photocopy of the original SS-5 or a computer extract of the information. You can request the record through SSA’s online portal or by mailing Form SSA-711 with the fee. SSA charges roughly $30 for genealogical requests as of 2024. Not free, but the birth information on these forms has broken open searches where the immigrant’s name was badly garbled on arrival records.