How many Thomas Donnelly census records do you have?

We have 3114 US Census records for Thomas Donnelly, from 1900 to 1950, across 49 states and DC.

What's in a Thomas Donnelly census record?

You'll see Thomas'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 Thomas Donnelly'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 Thomas Donnelly census records free?

Yes. All Thomas Donnelly 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 Thomas Donnelly?

We have Thomas Donnelly 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 Thomas Donnelly 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 Thomas Donnelly?

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.

Thomas Donnelly — US Census Records & Model Tree

We found 3114 free census records for Thomas Donnelly across 6 census years (1900–1950), in 49 states and DC and 390 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Thomas Donnelly Census Records by State & County

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Showing of 3114 records for Thomas Donnelly US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Thomas Donnelly	32	Wayne-County, Michigan	Michigan	Maintenance-Man	Son
1940	Thomas Donnelly	33	Hudson-County, New Jersey	New Jersey	Car Oiler	Head
1920	Thomas Donnelly		Kings, New York	New York	—	Son
1940	Thomas Donnelly	31	Erie-County, New York	New York	Janitor	Son
1940	Thomas Donnelly	27	Oneida-County, New York	New York	Cupola Charge	Head
1940	Thomas Donnelly	34	Mahoning-County, Ohio	Scotland	Electrician	Head
1940	Thomas Donnelly	40	Passaic-County, New Jersey	New Jersey	Clerk	Son
1930	Thomas Donnelly		Nassau, New York	New York	Mason	Head
1940	Thomas Donnelly	53	New-York-County, New York	Ireland	—	Head
1930	Thomas L Donnelly		Saline, Missouri	Illinois	Brakeman	Head
1940	Thomas Donnelly	37	Kings-County, New York	New York	Longshoreman	Head
1940	Thomas Donnelly	46	Will-County, Illinois	Scotland	Machinist	Head
1930	Thomas E Donnelly		Middlesex, Massachusetts	Massachusetts	Shipping Clerk	Head
1930	Thomas F Donnelly		Essex, Massachusetts	Massachusetts	Chauffeur	Son
1940	Thomas Donnelly	13	Philadelphia-County, Pennsylvania	Pennsylvania	—	Son
1940	Thomas Donnelly	46	Philadelphia-County, Pennsylvania	Northern Ireland	Fireman	Head
1920	Thomas H. Donnelly		Kennebec, Maine	Ireland	Superintendent	Head
1920	Thomas B. Donnelly		Kennebec, Maine	Maine	Accountant	Son
1940	Thomas Donnelly	17	Suffolk-County, Massachusetts	Massachusetts	—	Son
1920	Thomas J Donnelly		Bristol, Massachusetts	Massachusetts	Bookkeeper	Son
1900	Thomas J. Donnelly	17	Fulton, Georgia	Pennsylvania	At School	Son
1940	Thomas Donnelly	10	Essex-County, New Jersey	New Jersey	—	Son
1920	Thomas Donnelly		Hudson, New Jersey	New Jersey	Electrician	Son
1920	Thomas B Donnelly		New York, New York	New York	Clerk	Son
1920	Thomas Donnelly		Westchester, New York	New York	—	Son
1920	Thomas Donnelly		Jefferson, Ohio	Ireland	—	Head
1940	Thomas E. Donnelly	24	Suffolk-County, Massachusetts	Massachusetts	Post Clerk	Son
1940	Thomas Donnelly	39	Bronx-County, New York	New York	Investigator	Head
1940	Thomas Donnelly	17	Bronx-County, New York	New York	—	Son
1920	Thomas H. Donnelly		Richmond, New York	New York	Clerk	Son

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About Thomas Donnelly US Census Records & Model Tree

We've indexed 3114 free, proprietary US Census records for Thomas Donnelly across 1900–1950, covering 49 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, 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 Thomas 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 3114 US Census records for Thomas Donnelly, from 1900 to 1950, across 49 states and DC.
: You'll see Thomas'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 Thomas Donnelly'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 Thomas Donnelly 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 Thomas Donnelly 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 Donnelly US Census Records

James Donnelly John Donnelly Margaret Donnelly Mary Donnelly William Donnelly

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