How many Mary Tierney census records do you have?

We have 3964 US Census records for Mary Tierney, from 1900 to 1950, across 46 states and DC.

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

Yes. All Mary Tierney 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 Tierney?

We have Mary Tierney records from the 1900 through 1950 US Federal Census, across 46 states and DC. Use the year and state filters to narrow your results.

How do I find Mary Tierney 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 Tierney?

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 Tierney — US Census Records & Model Tree

We found 3964 free census records for Mary Tierney across 6 census years (1900–1950), in 46 states and DC and 414 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Tierney Census Records by State & County

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Showing of 3964 records for Mary Tierney US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Mary L. Tierney	26	Lackawanna-County, Pennsylvania	Pennsylvania	Liberty & Diamond	Daughter
1940	Mary Ellen Tierney	21	Ramsey-County, Minnesota	Minnesota	Stenographer	Daughter
1940	Mary J. Tierney	58	Hampden-County, Massachusetts	Vermont	Manager	Daughter
1920	Mary Tierney		Lackawanna, Pennsylvania	Pennsylvania	None	Daughter
1940	Mary Tierney	28	Middlesex-County, Massachusetts	Massachusetts	—	Wife
1920	Mary Tierney		Cascade, Montana	Connecticut	None	Wife
1920	Mary Tierney		Union, New Jersey	Ireland	—	Wife
1940	Mary J. Tierney	58	Dane-County, Wisconsin	Wisconsin	—	Wife
1940	Mary Tierney	69	Kings-County, New York	New York	—	Wife
1920	Mary Tierney		Kings, New York	Ireland	—	Head
1930	Mary A. N. Tierney		Providence, Rhode Island	Rhode Island	—	Head
1920	Mary E. Tierney		Providence, Rhode Island	Ireland	None	Head
1930	Mary Tierney		Kings, New York	New York	Letter Carrier	Daughter
1940	Mary Elizabeth Tierney	19	Union-County, New Jersey	New Jersey	Bookkeeper	Daughter
1910	Mary A Tierney		Allegheny, Pennsylvania	Ireland	None	Head
1910	Mary Tierney		Monroe, Iowa	Iowa	—	Wife
1930	Mary Tierney		Kings, New York	New York	None	Daughter
1930	Mary E. Tierney		Ramsey, Minnesota	Minnesota	—	Wife
1940	Mary Tierney	16	New-York-County, New York	New York	—	Daughter
1930	Mary Tierney		Plymouth, Massachusetts	Massachusetts	—	Daughter
1910	Mary A. Tierney		New York, New York	New York	—	Wife
1920	Mary Tierney		Cascade, Montana	Montana	None	Daughter
1930	Mary Tierney		None, None	Pennsylvania	Operator	Daughter
1910	Mary Tierney		New York, New York	Ireland	—	Wife
1940	Mary Tierney	55	Aitkin-County, Minnesota	Minnesota	—	Wife
1940	Mary Tierney	50	Suffolk-County, Massachusetts	Scotland	—	Wife
1910	Mary Tierney		Kings, New York	Ireland	—	Wife
1940	Mary Tierney	53	Kings-County, New York	New York	—	Wife
1940	Mary Tierney	12	Monroe-County, New York	New York	—	Daughter
1930	Mary Tierney		Bronx, New York	New York	—	Daughter

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About Mary Tierney US Census Records & Model Tree

We've indexed 3964 free, proprietary US Census records for Mary Tierney across 1900–1950, covering 46 states and DC: Alabama, 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, 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, Vermont, Virginia, Washington, West Virginia, Wisconsin.

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 3964 US Census records for Mary Tierney, from 1900 to 1950, across 46 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 Tierney'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 Tierney 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 Tierney records from the 1900 through 1950 US Federal Census, across 46 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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