How many Mary Donnelly census records do you have?

We have 7391 US Census records for Mary Donnelly, from 1900 to 1950, across 48 states and DC.

What's in a Mary Donnelly census record?

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

Yes. All Mary 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 Mary Donnelly?

We have Mary Donnelly records from the 1900 through 1950 US Federal Census, across 48 states and DC. Use the year and state filters to narrow your results.

How do I find Mary 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 Mary 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.

Mary Donnelly — US Census Records & Model Tree

We found 7391 free census records for Mary Donnelly across 6 census years (1900–1950), in 48 states and DC and 626 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Donnelly Census Records by State & County

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Showing of 7391 records for Mary Donnelly US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	Mary Donnelly		Philadelphia, Pennsylvania	Ireland	—	Wife
1920	Mary Donnelly		Essex, Massachusetts	Ireland	Wet Finisher	Wife
1920	Mary Donnelly		New York, New York	Ireland	Saleslady	Head
1920	Mary Donnelly		Essex, New Jersey	Ireland	—	Wife
1940	Mary D. Donnelly	66	Queens-County, New York	Ireland	—	Head
1940	Mary A Donnelly	53	Hudson-County, New Jersey	Connecticut	—	Wife
1940	Mary Donnelly	74	Queens-County, New York	England	—	Head
1940	Mary A Donnelly	57	Philadelphia-County, Pennsylvania	Ireland	—	Head
1940	Mary A. Donnelly	78	Middlesex-County, Massachusetts	England	—	Head
1930	Mary Donnelly		New York, New York	Michigan	Superintend Of Flowers	Wife
1940	Mary E. Donnelly	70	Middlesex-County, Massachusetts	Maine	—	Head
1920	Mary Donnelly		Essex, New Jersey	Ireland	—	Head
1940	Mary E. Donnelly	74	Providence-County, Rhode Island	Rhode Island	—	Head
1940	Mary Donnelly	39	Philadelphia-County, Pennsylvania	New Jersey	—	Wife
1940	Mary E. Donnelly	40	Suffolk-County, Massachusetts	Massachusetts	—	Wife
1930	Mary L Donnelly		Mercer, Pennsylvania	Pennsylvania	Stenographer	Daughter
1940	Mary Donnelly	41	Philadelphia-County, Pennsylvania	Northern Ireland	Waitress	Wife
1940	Mary Donnelly	56	Hudson-County, New Jersey	New Jersey	—	Wife
1920	Mary Donnelly		Marion, Indiana	Indiana	—	Daughter
1930	Mary C. Donnelly		Cook, Illinois	Illinois	Saleslady	Daughter
1920	Mary Donnelly		Hudson, New Jersey	New Jersey	—	Daughter
1940	Mary A. Donnelly	55	Philadelphia-County, Pennsylvania	Northern Ireland	—	Wife
1940	Mary Ruth Donnelly	35	Lavaca-County, Texas	Texas	—	Wife
1940	Mary M. Donnelly	29	Suffolk-County, Massachusetts	Massachusetts	Secretary	Daughter
1910	Mary Donnelly		Worcester, Massachusetts	Massachusetts	—	Daughter
1940	Mary E Donnelly	55	Hampden-County, Massachusetts	Nevada	—	Wife
1940	Mary Frances Donnelly	15	Hudson-County, New Jersey	New Jersey	—	Daughter
1910	Mary Donnelly		Essex, Massachusetts	Massachusetts	—	Daughter
1900	Mary Donnelly	11	Warren, Illinois	Nebraska	—	Daughter
1930	Mary Donnelly		Philadelphia, Pennsylvania	Penna	—	Daughter

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About Mary Donnelly US Census Records & Model Tree

We've indexed 7391 free, proprietary US Census records for Mary Donnelly across 1900–1950, covering 48 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, 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 Mary 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 7391 US Census records for Mary Donnelly, from 1900 to 1950, across 48 states and DC.
: You'll see Mary'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 Mary 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 Mary 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 Mary Donnelly records from the 1900 through 1950 US Federal Census, across 48 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 Thomas Donnelly William Donnelly

All Donnelly census records →

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