How many William Donnelly census records do you have?

We have 3612 US Census records for William Donnelly, from 1900 to 1950, across 50 states and DC.

What's in a William Donnelly census record?

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

Yes. All William 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 William Donnelly?

We have William Donnelly 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 William 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 William 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.

William Donnelly — US Census Records & Model Tree

We found 3612 free census records for William Donnelly across 6 census years (1900–1950), in 50 states and DC and 494 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

William Donnelly Census Records by State & County

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Showing of 3612 records for William Donnelly US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	William Donnelly	22	Queens-County, New York	New York	Clerk Sales	Son
1930	William Donnelly		Kings, New York	New York	Assistant	Son
1940	William Donnelly	30	Hampden-County, Massachusetts	Scotland	Rifler	Head
1940	William Donnelly	21	Westchester-County, New York	New York	Mach. Helper	Son
1940	William Donnelly	56	Summit-County, Ohio	Scotland	Tire Builder	Head
1930	William Donnelly		Mercer, Pennsylvania	Pennsylvania	Clerk	Son
1940	William Donnelly	11	Suffolk-County, Massachusetts	Massachusetts	—	Son
1940	William Donnelly	51	Will-County, Illinois	Scotland	Block Cutter	Head
1940	William Jr. Donnelly	16	Will-County, Illinois	Illinois	Pinsetter	Son
1910	William Donnelly		Suffolk, Massachusetts	Ireland	Laborer	Head
1940	William Donnelly	15	Philadelphia-County, Pennsylvania	Penna	—	Son
1910	William J. Donnelly		Kings, New York	New York	Printer	Head
1930	William F. Donnelly		Essex, New Jersey	Ireland	Electrician	Head
1940	William Jr. Donnelly	15	Middlesex-County, Massachusetts	Massachusetts	—	Son
1940	William Donnelly	31	Essex-County, New Jersey	New Jersey	Salesman	Head
1940	William J. Donnelly	22	Delaware-County, Pennsylvania	Pennsylvania	Wire Inspector	Son
1940	William J. Jr. Donnelly	20	Baldwin-County, Georgia	Georgia	Manager	Son
1920	William C. Donnelly		Atchison, Kansas	Kansas	Farmer	Head
1940	William M. Donnelly	54	Wayne-County, Michigan	Michigan	Attorney	Head
1940	William Donnelly	15	Jefferson-County, Kentucky	Kentucky	—	Son
1930	William Donnelly		Suffolk, Massachusetts	Massachusetts	—	Son
1920	William Donnelly		New York, New York	New York	Clerk	Son
1940	William J. Donnelly	23	Wayne-County, Michigan	Michigan	Salesman	Son
1900	William Donnelly	28	Cooke, Texas	Texas	Farmer	Head
1940	William H. Donnelly	19	Cook-County, Illinois	Illinois	Apprentice Electrician	Son
1910	William Donnelly		Idaho, Idaho	Washington	Laborer	Head
1940	William Donnelly	14	Philadelphia-County, Pennsylvania	Pennsylvania	—	Son
1920	William Donnelly		New York, New York	New York	None	Son
1940	William Donnelly	43	Northampton-County, Pennsylvania	Pennsylvania	Baker	Head
1940	William Donnelly	12	Cayuga-County, New York	New York	—	Son

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About William Donnelly US Census Records & Model Tree

We've indexed 3612 free, proprietary US Census records for William Donnelly 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 William 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 3612 US Census records for William Donnelly, from 1900 to 1950, across 50 states and DC.
: You'll see William'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 William 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 William 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 William Donnelly 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 Donnelly US Census Records

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