How many Mary Regan census records do you have?

We have 4977 US Census records for Mary Regan, from 1900 to 1950, across 49 states and DC.

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

Yes. All Mary Regan 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 Regan?

We have Mary Regan 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 Regan 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 Regan?

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 Regan — US Census Records & Model Tree

We found 4977 free census records for Mary Regan across 6 census years (1900–1950), in 49 states and DC and 526 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Regan Census Records by State & County

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Showing of 4977 records for Mary Regan US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	Mary Regan		Grafton, New Hampshire	New Hampshire	None	Daughter
1930	Mary A. Regan		Hudson, New Jersey	Ireland	—	Head
1940	Mary Regan	72	Luzerne-County, Pennsylvania	Ireland	—	Wife
1940	Mary Regan	56	New-York-County, New York	Ireland	—	Wife
1940	Mary E. Regan	50	Bronx-County, New York	Ireland	—	Wife
1940	Mary Regan	63	Lackawanna-County, Pennsylvania	Ireland	—	Head
1910	Mary Regan		Kings, New York	Ireland	Washerwoman	Wife
1940	Mary Regan	73	Suffolk-County, Massachusetts	Ireland	—	Head
1920	Mary Regan		New York, New York	Ireland	—	Head
1930	Mary M Regan		Rockingham, New Hampshire	New Hampshire	Nurse	Daughter
1930	Mary L Regan		Davidson, North Carolina	North Carolina	None	Daughter
1930	Mary R. Regan		Middlesex, Massachusetts	Massachusetts	Clerk	Daughter
1940	Mary Regan	15	Allegheny-County, Pennsylvania	Pennsylvania	—	Daughter
1940	Mary Regan	59	Hudson-County, New Jersey	Ireland	—	Head
1940	Mary Regan	39	Middlesex-County, Massachusetts	Mass.	Waitress Hostess	Wife
1940	Mary Regan	24	Hudson-County, New Jersey	New Jersey	Operator	Daughter
1920	Mary Regan		Middlesex, Massachusetts	Massachusetts	—	Daughter
1920	Mary Regan		Essex, Massachusetts	Massachusetts	Floorwork	Daughter
1930	Mary Regan		Hudson, New Jersey	New Jersey	None	Wife
1940	Mary F. Regan	11	Providence-County, Rhode Island	Rhode Island	—	Daughter
1940	Mary C. Regan	13	Hamilton-County, Ohio	Ohio	—	Daughter
1940	Mary A. Regan	18	Allegheny-County, Pennsylvania	Pennsylvania	—	Daughter
1940	Mary A. Regan	38	Labette-County, Kansas	Kansas	—	Wife
1900	Mary Regan	11	Suffolk, Massachusetts	Mass	—	Daughter
1920	Mary V Regan		Philadelphia, Pennsylvania	Pennsylvania	None	Daughter
1940	Mary J. Regan	11	Labette-County, Kansas	Kansas	—	Daughter
1920	Mary Regan		New York, New York	New York	—	Daughter
1930	Mary Regan		St Clair, Michigan	Michigan	—	Wife
1930	Mary Regan		Lackawanna, Pennsylvania	Pennsylvania	Cashier	Daughter
1920	Mary Regan		New York, New York	New York	—	Daughter

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About Mary Regan US Census Records & Model Tree

We've indexed 4977 free, proprietary US Census records for Mary Regan across 1900–1950, covering 49 states and DC: Alabama, Alaska, 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, 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 4977 US Census records for Mary Regan, 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 Regan'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 Regan 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 Regan 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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