How many Mary Duggan census records do you have?

We have 3380 US Census records for Mary Duggan, from 1900 to 1950, across 48 states and DC.

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

Yes. All Mary Duggan 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 Duggan?

We have Mary Duggan records from the 1900 through 1950 US Federal Census, across 48 states and DC. Use the year and state filters to narrow your results.

How do I find Mary Duggan 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 Duggan?

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 Duggan — US Census Records & Model Tree

We found 3380 free census records for Mary Duggan across 6 census years (1900–1950), in 48 states and DC and 477 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Duggan Census Records by State & County

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Showing of 3380 records for Mary Duggan US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Mary M. Duggan	32	New-York-County, New York	New York	Stenographer	Daughter
1930	Mary Duggan		Queens, New York	Ireland	—	Wife
1920	Mary Duggan		Hennepin, Minnesota	Massachusetts	None	Wife
1910	Mary A Duggan		Kings, New York	New York	Office Boy	Head
1920	Mary M. Duggan		Martin, North Carolina	North Carolina	—	Daughter
1910	Mary Duggan		Lake, Indiana	New York	—	Wife
1910	Mary Duggan		New York, New York	New York	—	Wife
1900	Mary J. Duggan	10	Providence, Rhode Island	Rhode Island	At School	Daughter
1900	Mary Duggan	34	Providence, Rhode Island	Rhode Island	—	Wife
1930	Mary Duggan		Middlesex, Massachusetts	Irish Free State	—	Wife
1930	Mary Duggan		Luzerne, Pennsylvania	Pennsylvania	—	Daughter
1940	Mary Duggan	34	Suffolk-County, Massachusetts	Massachusetts	Clerk - Steno.	Daughter
1910	Mary Duggan		Strafford, New Hampshire	New Hampshire	—	Daughter
1910	Mary Duggan		Bristol, Massachusetts	Rhode Island	—	Head
1930	Mary Duggan		Cook, Illinois	Illinois	—	Wife
1930	Mary Duggan		Cook, Illinois	Illinois	Saleswoman	Daughter
1930	Mary Duggan		Bristol, Massachusetts	Massachusetts	—	Daughter
1910	Mary A. Duggan		Worcester, Massachusetts	England	—	Wife
1940	Mary Lou Duggan	11	Washington-County, Georgia	Georgia	—	Daughter
1940	Mary T. Duggan	13	Suffolk-County, Massachusetts	Massachusetts	—	Daughter
1940	Mary Jane Duggan	13	Hennepin-County, Minnesota	Minnesota	—	Daughter
1930	Mary Duggan		Suffolk, Massachusetts	Massachusetts	Student	Daughter
1940	Mary Duggan	51	Hennepin-County, Minnesota	Minnesota	—	Wife
1930	Mary Duggan		Queens, New York	Rhode Island	—	Wife
1940	Mary Duggan	47	Cook-County, Illinois	Ireland	Janitress	Head
1940	Mary E. Duggan	44	Essex-County, Massachusetts	Massachusetts	Mender	Daughter
1940	Mary Virginia Duggan	16	La-Plata-County, Colorado	Colorado	—	Daughter
1940	Mary Duggan	41	New-London-County, Connecticut	Vermont	—	Wife
1920	Mary Duggan		Worcester, Massachusetts	Maine	—	Wife
1930	Mary Duggan		Middlesex, Massachusetts	Massachusetts	—	Daughter

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About Mary Duggan US Census Records & Model Tree

We've indexed 3380 free, proprietary US Census records for Mary Duggan across 1900–1950, covering 48 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.

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 3380 US Census records for Mary Duggan, from 1900 to 1950, across 48 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 Duggan'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 Duggan 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 Duggan records from the 1900 through 1950 US Federal Census, across 48 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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