How many Eugene Sullivan census records do you have?

We have 4456 US Census records for Eugene Sullivan, from 1900 to 1950, across 50 states and DC.

What's in a Eugene Sullivan census record?

You'll see Eugene's age, birthplace, occupation, and relationship to the head of household — plus everyone else who lived in the same home. For 1940 and 1950 records, you can also view the original handwritten census page.

How do I use census records for family research?

Census records are a snapshot of a family every 10 years. You can follow Eugene Sullivan's household over time — see when children appear, when people move states, and who's living together. YourRoots connects census data with Tree Matching and AI tools so you can build out your tree faster.

Are Eugene Sullivan census records free?

Yes. All Eugene Sullivan census records on YourRoots are free to search and view — no subscription required. We built our own index from the original federal census images.

Which census years and states cover Eugene Sullivan?

We have Eugene Sullivan records from the 1900 through 1950 US Federal Census, across 50 states and DC. Use the year and state filters to narrow your results.

How do I find Eugene Sullivan in the census?

Start by narrowing the year and state. If you know an approximate birth year, use the age column to match — census age minus the census year gives you a birth year estimate. Household members, birthplace, and occupation help confirm you have the right person.

What is the Model Tree for Eugene Sullivan?

The Model Tree is YourRoots' unique feature that links a person across multiple census decades and reconstructs their likely family — parents, siblings, spouse, and children — based on household patterns. It turns isolated records into a connected family network.

Where does the census data come from?

All records originate from the US Federal Census microfilm digitized by NARA (National Archives and Records Administration). YourRoots re-indexed the original page images using modern AI, catching names and details that older transcriptions missed.

Eugene Sullivan — US Census Records & Model Tree

We found 4456 free census records for Eugene Sullivan across 6 census years (1900–1950), in 50 states and DC and 621 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Eugene Sullivan Census Records by State & County

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Showing of 4456 records for Eugene Sullivan US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Eugene Sullivan	31	Jefferson-County, Kentucky	Kentucky	Janitor	Head
1940	Eugene J Sullivan	36	St.-Louis-County, Missouri	Missouri	Salesman	Head
1940	Eugene Sullivan	21	New-York-County, New York	New York	General Clerk	Son
1930	Eugene Sullivan		Allegheny, Pennsylvania	Pennsylvania	Maintenance Clerk	Son
1930	Eugene S. Jr. Sullivan		Lee, Illinois	Illinois	—	Son
1930	Eugene F Sullivan		Broome, New York	New York	Salesman	Head
1930	Eugene Sullivan		Cook, Illinois	Illinois	Clerk	Son
1930	Eugene H Sullivan		Middlesex, Massachusetts	Massachusetts	Salesman	Head
1930	Eugene J. Sullivan		Kings, New York	New York	Dispatcher	Head
1940	Eugene Sullivan	30	Suffolk-County, Massachusetts	Massachusetts	Porter	Son
1940	Eugene Sullivan	27	Bronx-County, New York	New York	Clerk	Head
1940	Eugene J. Jr. Sullivan	34	Saratoga-County, New York	New York	Bookkeeping Clerk	Son
1930	Eugene Sullivan		New York, New York	Ireland	Tyman	Head
1940	Eugene Sullivan	57	New-York-County, New York	Ireland	Fireman	Head
1940	Eugene J Sullivan	70	Lancaster-County, Nebraska	Michigan	—	Head
1920	Eugene Sullivan		Hampden, Massachusetts	Ireland	Machine Tender	Head
1930	Eugene Sullivan		New York, New York	France	None	Wife
1920	Eugene Sullivan		Bristol, Massachusetts	Ireland	—	Head
1930	Eugene J. Sullivan		Bristol, Massachusetts	Massachusetts	Conductor	Head
1940	Eugene Sullivan	64	Lee-County, Illinois	Illinois	Medical Doctor	Head
1940	Eugene J. Sullivan	48	Essex-County, Massachusetts	Massachusetts	Printer	Head
1940	Eugene Sullivan	43	Erie-County, New York	New York	Attendant	Head
1940	Eugene Sullivan	62	Le-Sueur-County, Minnesota	Minnesota	Farmer	Head
1920	Eugene F Sullivan		Worcester, Massachusetts	Ireland	—	Head
1940	Eugene Sullivan	46	Richmond-County, New York	New York	Driver	Head
1940	Eugene Sullivan	76	Macoupin-County, Illinois	Illinois	Mines	Head
1940	Eugene H. Sullivan	78	Shawnee-County, Kansas	Kansas	—	Head
1940	Eugene Sullivan	64	Walworth-County, Wisconsin	Wisconsin	Janitor	Head
1930	Eugene Sullivan		New York, New York	Ireland	Chauffeur	Head
1940	Eugene Sullivan	29	Kings-County, New York	New York	Reporter	Head

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About Eugene Sullivan US Census Records & Model Tree

We've indexed 4456 free, proprietary US Census records for Eugene Sullivan across 1900–1950, covering 50 states and DC: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming.

Each record includes our Model Tree — a longitudinal reconstruction that links the same person across census decades using machine learning (XGBoost record linkage). Every link carries a confidence score: Verified (≥0.99), Confirmed (≥0.95), or Linked (lower confidence). This tells you not just what the census says, but how reliably we've connected records across time.

Every record also shows the full household — who Eugene lived with, their ages, birthplaces, and occupations. For 1940 and 1950 records, you can view the original handwritten census page from the National Archives.

How we build the Model Tree. YourRoots independently indexes US Census records from NARA microfilm and links persons across decades using XGBoost-based record linkage. Each link's confidence is a per-pair match score from the model. Household corroboration (co-residents appearing on the same census pages in multiple years) strengthens the signal. The Model Tree is not a family tree submitted by users — it's reconstructed from the census data itself.

Last updated: July 30, 2026

Frequently Asked Questions

: We have 4456 US Census records for Eugene Sullivan, from 1900 to 1950, across 50 states and DC.
: You'll see Eugene's age, birthplace, occupation, and relationship to the head of household — plus everyone else who lived in the same home. For 1940 and 1950 records, you can also view the original handwritten census page.
: Census records are a snapshot of a family every 10 years. You can follow Eugene Sullivan's household over time — see when children appear, when people move states, and who's living together. YourRoots connects census data with Tree Matching and AI tools so you can build out your tree faster.
: Yes. All Eugene Sullivan census records on YourRoots are free to search and view — no subscription required. We built our own index from the original federal census images.
: We have Eugene Sullivan records from the 1900 through 1950 US Federal Census, across 50 states and DC. Use the year and state filters above to narrow your results.
: Start by narrowing the year and state. If you know an approximate birth year, use the age column to match — census age minus the census year gives you a birth year estimate. Household members, birthplace, and occupation help confirm you have the right person.
: The Model Tree is YourRoots' unique feature that links a person across multiple census decades and reconstructs their likely family — parents, siblings, spouse, and children — based on household patterns. It turns isolated records into a connected family network.
: All records originate from the US Federal Census microfilm digitized by NARA (National Archives and Records Administration). YourRoots re-indexed the original page images using modern AI, catching names and details that older transcriptions missed.

Other Sullivan US Census Records

Agnes Sullivan Alice Sullivan Anna Sullivan Annie Sullivan Arthur Sullivan Catherine Sullivan Charles Sullivan Cornelius Sullivan Daniel Sullivan Dennis Sullivan Dorothy Sullivan Edward Sullivan Elizabeth Sullivan Ellen Sullivan Florence Sullivan Francis Sullivan Frank Sullivan George Sullivan Helen Sullivan James Sullivan Jeremiah Sullivan John Sullivan Joseph Sullivan Julia Sullivan Katherine Sullivan Margaret Sullivan Mary Sullivan Michael Sullivan Nellie Sullivan Patrick Sullivan Richard Sullivan Robert Sullivan Ruth Sullivan Sarah Sullivan Thomas Sullivan Timothy Sullivan William Sullivan

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