How many Mary Hayden census records do you have?

We have 4273 US Census records for Mary Hayden, from 1900 to 1950, across 49 states and DC.

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

Yes. All Mary Hayden 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 Hayden?

We have Mary Hayden 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 Hayden 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 Hayden?

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 Hayden — US Census Records & Model Tree

We found 4273 free census records for Mary Hayden across 6 census years (1900–1950), in 49 states and DC and 889 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Hayden Census Records by State & County

Records per state:

Census Record Search

First Name

Middle Name

Last Name (Required)

Census Year

State

Birth Year

Year Range

Birthplace

Age From

Age To

Exact match: Name Location Year

Alternate First Names (comma-separated)

Alternate Last Names (comma-separated)

County

Sex

Marital Status

Race

Relationship to Head

Occupation

Census Page ID

Family Members (in same household)

Search Records

Showing of 4273 records for Mary Hayden US Census, ranked by Model Tree richness

No records match your filters.

Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Mary A Hayden	71	Douglas-County, Kansas	New York	—	Daughter
1930	Mary C Hayden		Stark, Ohio	Ohio	—	Daughter
1920	Mary Hayden		La Salle, Illinois	Ireland	—	Wife
1920	Mary F. Hayden		Essex, Massachusetts	Massachusetts	—	Head
1940	Mary Hayden	43	St.-Clair-County, Illinois	Missouri	—	Wife
1940	Mary C. Hayden	62	Charles-County, Maryland	Maryland	—	Wife
1940	Mary A. Hayden	82	Jackson-County, Missouri	Missouri	—	Wife
1940	Mary A Hayden	54	Ringgold-County, Iowa	Ohio	—	Wife
1910	Mary Hayden		Jefferson, Kentucky	Kentucky	—	Wife
1920	Mary Hayden		Kings, New York	Ireland	None	Head
1940	Mary Hayden	34	Daviess-County, Kentucky	Kentucky	—	Wife
1940	Mary N Hayden	16	Daviess-County, Kentucky	Kentucky	—	Daughter
1940	Mary Hayden	11	Kings-County, New York	New York	—	Daughter
1930	Mary Hayden		St Clair, Illinois	Kentucky	—	Wife
1940	Mary Belle Hayden	12	Tangipahoa-County, Louisiana	Louisiana	—	Daughter
1940	Mary H Hayden	15	Hickman-County, Kentucky	Kentucky	—	Daughter
1940	Mary E. Hayden	14	Floyd-County, Kentucky	Kentucky	—	Daughter
1930	Mary L Hayden		Sullivan, Indiana	Indiana	—	Daughter
1910	Mary A. Hayden		Dutchess, New York	Ireland	—	Head
1940	Mary R. Hayden	40	Douglas-County, Kansas	Kansas	—	Wife
1910	Mary Hayden		Orange, New York	Ireland	—	Wife
1910	Mary Hayden		Kings, New York	New York	—	Wife
1940	Mary N. Hayden	27	Monroe-County, Indiana	Indiana	—	Wife
1940	Mary E. Hayden	13	Hanover-County, Virginia	Virginia	—	Daughter
1940	Mary B. Hayden	12	Penobscot-County, Maine	Maine	—	Daughter
1930	Mary Hayden		Niagara, New York	New York	—	Wife
1910	Mary Hayden		New York, New York	Ireland	Office Cl.	Wife
1940	Mary Hayden	58	Essex-County, New Jersey	New Jersey	—	Wife
1940	Mary J. Hayden	27	Carlisle-County, Kentucky	Kentucky	—	Wife
1940	Mary E. Hayden	34	Hartford-County, Connecticut	England	—	Wife

Load More Mary Hayden Census Records

About Mary Hayden US Census Records & Model Tree

We've indexed 4273 free, proprietary US Census records for Mary Hayden 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 4273 US Census records for Mary Hayden, 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 Hayden'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 Hayden 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 Hayden 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.