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Cornelius Sullivan — US Census Records & Model Tree

We found 3433 free census records for Cornelius Sullivan across 6 census years (1900–1950), in 49 states and DC and 371 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

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Showing of 3433 records for Cornelius Sullivan US Census, ranked by Model Tree richness
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Year Name Age Location Birthplace Occupation Relation
1940 Cornelius Sullivan 54 New-York-County, New York New York Clerk Head
1940 Cornelius Sullivan 39 Queens-County, New York New York Police Sergeant Head
1940 Cornelius Sullivan 37 Bergen-County, New Jersey New Jersey Chauffeur Head
1940 Cornelius Sullivan 32 Bronx-County, New York New York Clerk Head
1920 Cornelius Sullivan Bronx, New York New York Gas Fitter Son
1920 Cornelius Sullivan Bristol, Massachusetts Massachusetts Bookkeeper Son
1940 Cornelius Sullivan 28 New-York-County, New York New York Clerical Son
1940 Cornelius Sullivan 39 Chemung-County, New York New York Postal Clerk Head
1940 Cornelius Sullivan 41 Hudson-County, New Jersey New Jersey Fireman Head
1940 Cornelius Sullivan 30 Bronx-County, New York New York Bricklayer Son
1920 Cornelius Sullivan Douglas, Nebraska Nebraska Clerk Son
1940 Cornelius Sullivan 32 Lake-County, Illinois Illinois Proof Reading Head
1940 Cornelius Sullivan 32 Suffolk-County, Massachusetts Massachusetts Supervisor Son
1940 Cornelius Sullivan 26 Union-County, New Jersey New Jersey — Son
1920 Cornelius Sullivan Bronx, New York Ireland Engineer Head
1940 Cornelius Sullivan 72 Hampden-County, Massachusetts Ireland — Head
1940 Cornelius Sullivan 63 Norfolk-County, Massachusetts Ireland Dockman Head
1930 Cornelius Sullivan Schuylkill, Pennsylvania Pennsylvania None Head
1930 Cornelius F Sullivan New York, New York Ireland Letter Carrier Head
1930 Cornelius F Sullivan Middlesex, Massachusetts Massachusetts Agent-Ins. Head
1920 Cornelius Sullivan Essex, Massachusetts Ireland — Head
1920 Cornelius Sullivan Norfolk, Massachusetts Ireland Conductor Head
1920 Cornelius Sullivan Bristol, Massachusetts Ireland — Head
1940 Cornelius Sullivan 37 Strafford-County, New Hampshire NEW HAMPSHIRE Foreman Head
1920 Cornelius Sullivan Kings, New York Ireland — Head
1920 Cornelius Sullivan Suffolk, Massachusetts Ireland Laborer Head
1920 Cornelius Sullivan New York, New York Ireland Inspector Head
1920 Cornelius Sullivan San Francisco, California Ireland None Head
1940 Cornelius Sullivan 78 Will-County, Illinois Ireland — Head
1930 Cornelius Sullivan New York, New York Ireland None Head
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About Cornelius Sullivan US Census Records & Model Tree

We've indexed 3433 free, proprietary US Census records for Cornelius Sullivan across 1900–1950, covering 49 states and DC: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, 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 Cornelius 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 3433 US Census records for Cornelius Sullivan, from 1900 to 1950, across 49 states and DC.
You'll see Cornelius'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 Cornelius 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 Cornelius 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 Cornelius 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 Daniel Sullivan Dennis 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
All Sullivan census records →

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