How many Mary Delaney census records do you have?

We have 5320 US Census records for Mary Delaney, from 1900 to 1950, across 50 states and DC.

What's in a Mary Delaney 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 Delaney'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 Delaney census records free?

Yes. All Mary Delaney 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 Delaney?

We have Mary Delaney 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 Mary Delaney 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 Delaney?

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 Delaney — US Census Records & Model Tree

We found 5320 free census records for Mary Delaney across 6 census years (1900–1950), in 50 states and DC and 708 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Delaney Census Records by State & County

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Showing of 5320 records for Mary Delaney US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	Mary Delaney		New York, New York	New York	Student	Daughter
1940	Mary Delaney	21	Ramsey-County, Minnesota	Minnesota	Sales Lady	Daughter
1930	Mary Delaney		Hudson, New Jersey	Ireland	—	Wife
1920	Mary Delaney		New York, New York	Ireland	—	Wife
1920	Mary Delaney		Cook, Illinois	Ireland	—	Wife
1940	Mary A Delaney	73	Essex-County, Massachusetts	Ireland	—	Wife
1940	Mary Delaney	71	Will-County, Illinois	Illinois	—	Wife
1900	Mary A Delaney	40	Norfolk, Massachusetts	Ireland	—	Wife
1920	Mary J Delaney		Cook, Illinois	Connecticut	—	Wife
1940	Mary Q. Delaney	69	Rensselaer-County, New York	Ireland	—	Head
1930	Mary Delaney		Kings, New York	New York	—	Wife
1910	Mary V Delaney		Erie, Pennsylvania	Pennsylvania	None	Daughter
1910	Mary Delaney		Essex, New Jersey	Ireland	None	Wife
1930	Mary Delaney		Olmsted, Minnesota	Minnesota	—	Daughter
1930	Mary Jetta Delaney		Rock, Wisconsin	Wisconsin	Laborer	Wife
1920	Mary Delaney		Middlesex, Massachusetts	Massachusetts	—	Daughter
1930	Mary Delaney		New York, New York	New York	—	Daughter
1920	Mary Delaney		New York, New York	New York	Operator	Daughter
1940	Mary Delaney	20	New-York-County, New York	New York	Packer	Daughter
1900	Mary E Delaney	36	Dutchess, New York	New York	—	Wife
1940	Mary M. Delaney	12	Knox-County, Missouri	Missouri	—	Daughter
1940	Mary Delaney	14	Troup-County, Georgia	Georgia	—	Daughter
1940	Mary J Delaney	50	Middlesex-County, Massachusetts	New Hampshire	—	Wife
1940	Mary Delaney	13	Columbia-County, New York	New York	—	Daughter
1910	Mary Delaney		Champaign, Illinois	Indiana	—	Wife
1910	Mary Delaney		Erie, New York	Ireland	—	Wife
1940	Mary Delaney	39	Woodbury-County, Iowa	Nebraska	—	Wife
1940	Mary Delaney	49	Suffolk-County, Massachusetts	Newfoundland	0	Wife
1910	Mary Delaney		Dutchess, New York	Ireland	—	Wife
1940	Mary Delaney	35	Middlesex-County, New Jersey	New Jersey	Teacher	Daughter

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About Mary Delaney US Census Records & Model Tree

We've indexed 5320 free, proprietary US Census records for Mary Delaney 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 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 5320 US Census records for Mary Delaney, from 1900 to 1950, across 50 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 Delaney'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 Delaney 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 Delaney 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.

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