How many Mary Corcoran census records do you have?

We have 3422 US Census records for Mary Corcoran, from 1900 to 1950, across 45 states and DC.

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

Yes. All Mary Corcoran 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 Corcoran?

We have Mary Corcoran records from the 1900 through 1950 US Federal Census, across 45 states and DC. Use the year and state filters to narrow your results.

How do I find Mary Corcoran 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 Corcoran?

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 Corcoran — US Census Records & Model Tree

We found 3422 free census records for Mary Corcoran across 6 census years (1900–1950), in 45 states and DC and 365 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Corcoran Census Records by State & County

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Showing of 3422 records for Mary Corcoran US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	Mary Corcoran		Denver, Colorado	Colorado	Bookkeeper	Daughter
1940	Mary Corcoran	50	Cook-County, Illinois	Ireland	—	Wife
1900	Mary Corcoran	49	New York, New York	New York	—	Head
1940	Mary Corcoran	78	Philadelphia-County, Pennsylvania	England	—	Head
1940	Mary Aileen Corcoran	16	Yolo-County, California	California	—	Daughter
1910	Mary Corcoran		Allegheny, Pennsylvania	Pennsylvania	—	Daughter
1910	Mary J. Corcoran		Allegheny, Pennsylvania	England	—	Wife
1910	Mary Corcoran		Dutchess, New York	Ireland	Housekeeper	Wife
1910	Mary Corcoran		Cook, Illinois	Ireland	—	Wife
1900	Mary Corcoran	43	New York, New York	Ireland	—	Wife
1940	Mary Corcoran	10	Bronx-County, New York	New York	—	Daughter
1930	Mary Corcoran		Bronx, New York	Ireland	—	Wife
1930	Mary Corcoran		Douglas, Nebraska	Nebraska	—	Wife
1940	Mary E Corcoran	43	Monroe-County, New York	Connecticut	—	Wife
1940	Mary Corcoran	46	Ogle-County, Illinois	Illinois	—	Wife
1930	Mary A. Corcoran		Hudson, New Jersey	New Jersey	Waitress	Daughter
1910	Mary Corcoran		Wood, Wisconsin	Massachusetts	None	Wife
1930	Mary C Corcoran		Hampden, Massachusetts	Massachusetts	Chief Operator	Daughter
1940	Mary Corcoran	18	Essex-County, New Jersey	New Jersey	—	Daughter
1930	Mary Corcoran		Middlesex, Massachusetts	Massachusetts	File-Clerk	Daughter
1940	Mary E Corcoran	23	New-York-County, New York	New York	Cashier	Daughter
1940	Mary Corcoran	59	New-York-County, New York	Irish Free State	—	Head
1930	Mary Corcoran		Ulster, New York	New York	—	Daughter
1940	Mary Corcoran	26	Hudson-County, New Jersey	New Jersey	Secretary	Daughter
1930	Mary Corcoran		Essex, New Jersey	New Jersey	—	Daughter
1940	Mary Ellen Corcoran	44	Mahoning-County, Ohio	Ireland	—	Wife
1910	Mary Corcoran		Chouteau, Montana	Canada	—	Wife
1940	Mary Corcoran	18	Suffolk-County, Massachusetts	Massachusetts	—	Daughter
1940	Mary L. Corcoran	19	Clark-County, Ohio	Ohio	—	Daughter
1940	Mary Corcoran	38	New-York-County, New York	New York	—	Wife

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About Mary Corcoran US Census Records & Model Tree

We've indexed 3422 free, proprietary US Census records for Mary Corcoran across 1900–1950, covering 45 states and DC: Alabama, Arizona, 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 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 3422 US Census records for Mary Corcoran, from 1900 to 1950, across 45 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 Corcoran'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 Corcoran 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 Corcoran records from the 1900 through 1950 US Federal Census, across 45 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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