Immigration and naturalisation records

For most American families, this is the record set that crosses an ocean. It is also the one where a single detail — a village name — changes what is possible for every generation before it.

Three different records, often confused

Passenger manifests

The ship's list, recorded at the port of arrival. New York's Castle Garden handled arrivals from 1855 to 1890, and Ellis Island from 1892 to 1957. Earlier arrivals are mostly unrecorded at federal level before 1820, though some port and state lists survive. From the 1880s onward manifests ask for last residence and often a specific town, plus the name of a relative in the old country — the single most valuable line on the page.

Naturalisation records

A two-step process historically: a declaration of intention, then a petition for naturalisation after a waiting period, heard in a court. These are held variously by county courts, state courts and federal courts, which is why they are scattered. The petition usually names the arrival port, ship and date, plus a witness who is often a relative or neighbour.

Passport applications

Underused. From 1906 they include a photograph, a birth date and place, and an oath of allegiance. For someone who travelled back to Europe, they can pin down an exact birthplace.

Working from a census clue

The 1900 to 1930 censuses record year of immigration and whether the person was naturalised. Use that year as a starting point rather than a fact: people rounded, and enumerators guessed. Search a window of two or three years on either side, and search every plausible spelling of a surname that was almost certainly transliterated at arrival.

When the name is wrong

Most "the name was changed at Ellis Island" stories are myths — manifests were filled in at departure. What actually happened is that the immigrant, the shipping agent, or the clerk spelled phonetically. Search by first name, approximate age, arrival year and ethnicity together; if that fails, search the manifest images for the port and date and read the pages around where the family should be.

Where these records live

The National Archives holds federal passenger lists and naturalisation indexes; the National Park Service hosts a free searchable Ellis Island manifest database; FamilySearch has extensive port and court collections; state archives hold many lower-court naturalisations. Subscription sites mostly resell the same images with better search, which matters most when you are searching a common surname. See how the services compare.

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