How many Mary Hayes census records do you have?

We have 15366 US Census records for Mary Hayes, from 1900 to 1950, across 49 states and DC.

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

Yes. All Mary Hayes 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 Hayes?

We have Mary Hayes 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 Mary Hayes 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 Hayes?

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 Hayes — US Census Records & Model Tree

We found 15366 free census records for Mary Hayes across 6 census years (1900–1950), in 49 states and DC and 1893 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Hayes Census Records by State & County

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Showing of 15366 records for Mary Hayes US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Mary E. Hayes	50	Merrimack-County, New Hampshire	New Hampshire	—	Daughter
1930	Mary Hayes		Cook, Illinois	Illinois	Stenographer	Daughter
1930	Mary Hayes		Davidson, Tennessee	Tennessee	Cook	Daughter
1920	Mary A. Hayes		Suffolk, Massachusetts	Ireland	Clerk	Daughter
1940	Mary Hayes	27	Cook-County, Illinois	Illinois	Saleslady	Daughter
1930	Mary A Hayes		Orange, Indiana	Indiana	—	Daughter
1920	Mary Hayes		New York, New York	New York	Saleslady	Daughter
1940	Mary E. Hayes	57	Norfolk-County, Massachusetts	Massachusetts	—	Daughter
1920	Mary Hayes		Bristol, Massachusetts	Massachusetts	Speeder Tender	Daughter
1940	Mary E Hayes	32	Cook-County, Illinois	Illinois	—	Daughter
1920	Mary E Hayes		Marion, Indiana	Illinois	Stenographer	Daughter
1930	Mary S Hayes		Texas, Oklahoma	Oklahoma	—	Daughter
1940	Mary Hayes	20	Passaic-County, New Jersey	New Jersey	—	Daughter
1940	Mary Hayes	24	Middlesex-County, Massachusetts	Massachusetts	—	Wife
1940	Mary Hayes	26	Walworth-County, Wisconsin	Illinois	—	Daughter
1910	Mary Hayes		New York, New York	Ireland	None	Head
1920	Mary Hayes		Suffolk, Massachusetts	Ireland	—	Wife
1920	Mary Hayes		New York, New York	Ireland	—	Wife
1900	Mary Hayes	43	Spartanburg, South Carolina	South Carolina	Farm Laborer	Wife
1920	Mary M Hayes		Suffolk, Massachusetts	Ireland	—	Wife
1930	Mary Hayes		Cook, Illinois	Ireland	—	Head
1920	Mary Hayes		New York, New York	Ireland	—	Wife
1940	Mary Hayes	43	Cuyahoga-County, Ohio	Alabama	Domestic	Head
1900	Mary L Hayes	41	Gates, North Carolina	North Carolina	—	Wife
1940	Mary A. Hayes	39	Essex-County, Massachusetts	Massachusetts	—	Wife
1940	Mary Hayes	45	Richmond-City-County, Virginia	Virginia	Maid	Head
1940	Mary Hayes	66	Cook-County, Illinois	Ireland	—	Head
1920	Mary Hayes		Philadelphia, Pennsylvania	Ireland	—	Head
1920	Mary Hayes		New York, New York	Ireland	—	Head
1940	Mary Hayes	53	Addison-County, Vermont	Vermont	—	Wife

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About Mary Hayes US Census Records & Model Tree

We've indexed 15366 free, proprietary US Census records for Mary Hayes across 1900–1950, covering 49 states and DC: Alabama, 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 15366 US Census records for Mary Hayes, from 1900 to 1950, across 49 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 Hayes'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 Hayes 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 Hayes 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.

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