How many Dennis Sullivan census records do you have?

We have 3815 US Census records for Dennis Sullivan, from 1900 to 1950, across 49 states and DC.

What's in a Dennis Sullivan census record?

You'll see Dennis'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 Dennis 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 Dennis Sullivan census records free?

Yes. All Dennis 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 Dennis Sullivan?

We have Dennis Sullivan records from the 1900 through 1950 US Federal Census, across 49 states and DC. Use the year and state filters to narrow your results.

How do I find Dennis 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 Dennis 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.

Dennis Sullivan — US Census Records & Model Tree

We found 3815 free census records for Dennis Sullivan across 6 census years (1900–1950), in 49 states and DC and 541 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Dennis Sullivan Census Records by State & County

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Showing of 3815 records for Dennis Sullivan US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	Dennis J Sullivan		Providence, Rhode Island	Rhode Island	Manager	Head
1940	Dennis Sullivan	36	Kings-County, New York	New York	Clerk	Head
1920	Dennis T Sullivan		Merrimack, New Hampshire	New Hampshire	—	Son
1920	Dennis Sullivan		Providence, Rhode Island	Rhode Island	Stenographer	Son
1920	Dennis Sullivan		Newport, Rhode Island	Rhode Island	Driver	Head
1940	Dennis Sullivan	35	Marion-County, Indiana	Indiana	Brakeman	Son
1940	Dennis Sullivan	36	Clinton-County, Missouri	Missouri	Farmer	Son
1930	Dennis Sullivan		Newport, Rhode Island	Ireland	Labour	Head
1940	Dennis Sullivan	78	Stevens-County, Minnesota	Minnesota	Farmer	Head
1940	Dennis R. Sullivan	75	New-London-County, Connecticut	Ireland	—	Head
1920	Dennis Sullivan		St Louis, Minnesota	Michigan	Brakeman	Head
1900	Dennis Sullivan	69	Middlesex, Massachusetts	Ireland	—	Head
1920	Dennis Sullivan		New York, New York	Ireland	Laborer	Head
1920	Dennis Sullivan		New York, New York	Ireland	Porter	Head
1920	Dennis Sullivan		Middlesex, Massachusetts	Ireland	Laborer	Head
1920	Dennis Sullivan		New Haven, Connecticut	Ireland	Machinist	Head
1920	Dennis Sullivan		Kings, New York	Ireland	Attendant	Head
1930	Dennis Sullivan		Essex, Massachusetts	Ireland	Attendant	Head
1940	Dennis Sullivan	62	Suffolk-County, Massachusetts	Ireland	Laborer	Head
1920	Dennis H Sullivan		Queens, New York	New York	Clerk	Head
1920	Dennis J. Sullivan		St Louis, Missouri	Missouri	Messenger	Head
1940	Dennis L. Sullivan	66	Shelby-County, Iowa	Iowa	Farmer	Head
1930	Dennis Sullivan		The Bronx, New York	Ireland	Police Officer	Head
1920	Dennis Sullivan		Middlesex, Massachusetts	Ireland	Layer-Helper	Head
1920	Dennis Sullivan		New York, New York	Ireland	Policeman	Head
1920	Dennis Sullivan		Providence, Rhode Island	Ireland	—	Head
1940	Dennis Sullivan	74	York-County, Maine	Maine	—	Head
1920	Dennis Sullivan		Suffolk, Massachusetts	Ireland	Fireman	Head
1920	Dennis J Sullivan		Jefferson, Kentucky	Rhode Island	Retail Merchant	Head
1920	Dennis Sullivan		Houghton, Michigan	Ireland	None	Head

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About Dennis Sullivan US Census Records & Model Tree

We've indexed 3815 free, proprietary US Census records for Dennis Sullivan across 1900–1950, covering 49 states and DC: Alabama, 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 Dennis 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 3815 US Census records for Dennis Sullivan, from 1900 to 1950, across 49 states and DC.
: You'll see Dennis'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 Dennis 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 Dennis 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 Dennis Sullivan records from the 1900 through 1950 US Federal Census, across 49 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 Dorothy Sullivan Edward Sullivan Elizabeth Sullivan Ellen Sullivan Eugene 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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