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Best Genealogy Sites to Search Records for O'Sullivan Surname / Last Name

Learn where genealogists search family records for your "O'Sullivan" surname & last name. Here are trusted sources for genealogy record search by YourRoots data.

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Top Genealogy Sources for Records for O'Sullivan Surname / Last Name

We’ve compiled data from YourRoots Map to determine which genealogy sites and sources are most frequently used to research the “O'Sullivan” surname. The list below is sorted by popularity, but remember—even lesser-known resources can be incredibly helpful. Genealogy research is personal and unique, so you never know where you might find that important record.
Sortable Chart Example

Learn more about link surname / last name origin, history, and meaning on YourRoots Map


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Where to Search Records for O'Sullivan Surname / Last name for free: FamilySearch availability analysis

Below is a comprehensive list of popular genealogy sources alogside with which one is available on FamilySearch for free.

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The full list of genealogy record sources for O'Sullivan Surname / Last name


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England & Wales, Civil Registration Death Index, 1916-2007
1930 United States Federal Census
1940 United States Federal Census
New York, U.S., Arriving Passenger and Crew Lists (including Castle Garden and Ellis Island), 1820-1957

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