How many Mary Callahan census records do you have?

We have 9329 US Census records for Mary Callahan, from 1900 to 1950, across 50 states and DC.

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

Yes. All Mary Callahan 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 Callahan?

We have Mary Callahan records from the 1900 through 1950 US Federal Census, across 50 states and DC. Use the year and state filters to narrow your results.

How do I find Mary Callahan 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 Callahan?

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 Callahan — US Census Records & Model Tree

We found 9329 free census records for Mary Callahan across 6 census years (1900–1950), in 50 states and DC and 924 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Callahan Census Records by State & County

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Showing of 9329 records for Mary Callahan US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Mary E. Callahan	25	Bergen-County, New Jersey	New Jersey	Typist	Daughter
1930	Mary Callahan		Campbell, Kentucky	Ohio	Clerk	Daughter
1940	Mary A Callahan	36	Hampden-County, Massachusetts	Connecticut	Operator	Daughter
1910	Mary C. Callahan		Mcdonough, Illinois	Illinois	—	Daughter
1940	Mary E Callahan	28	Baltimore-City-County, Maryland	Maryland	—	Wife
1920	Mary E. Callahan		Cuyahoga, Ohio	Vermont	Private Secretary	Daughter
1940	Mary E Callahan	48	Jackson-County, Ohio	Ohio	—	Wife
1940	Mary Callahan	48	New-York-County, New York	Ireland	0	Wife
1940	Mary Callahan	60	Tippecanoe-County, Indiana	Indiana	—	Wife
1940	Mary Callahan	58	Queens-County, New York	Ireland	—	Wife
1940	Mary Callahan	74	Pueblo-County, Colorado	Ohio	—	Wife
1940	Mary Callahan	80	Marion-County, Indiana	Indiana	—	Head
1930	Mary Callahan		New York, New York	Ireland	Janitor	Wife
1930	Mary Callahan		Suffolk, Massachusetts	Ireland	Home-W	Head
1920	Mary Callahan		Middlesex, Massachusetts	Rhode Island	Forewoman	Head
1940	Mary Callahan	12	Boyd-County, Kentucky	Kentucky	—	Daughter
1930	Mary Callahan		Philadelphia, Pennsylvania	Pennsylvania	—	Wife
1930	Mary E Callahan		Fulton, Georgia	Georgia	Book Keeper	Daughter
1940	Mary Callahan	19	Hillsborough-County, New Hampshire	New Hampshire	—	Daughter
1940	Mary Lee Callahan	17	Bowie-County, Texas	Texas	—	Daughter
1910	Mary Callahan		Bristol, Massachusetts	Connecticut	—	Wife
1940	Mary A. Callahan	54	Allen-County, Indiana	Indiana	—	Wife
1940	Mary E. Callahan	29	Allen-County, Indiana	Indiana	Bookkeeper	Daughter
1930	Mary Callahan		New Castle, Delaware	Delaware	Servant	Daughter
1940	Mary J. Callahan	21	Marion-County, Indiana	Indiana	—	Daughter
1940	Mary Jane Callahan	18	Allen-County, Ohio	Ohio	—	Daughter
1900	Mary J Callahan	44	Bladen, North Carolina	North Carolina	—	Wife
1910	Mary E Callahan		Merrimack, New Hampshire	New Hampshire	Book Binder	Daughter
1940	Mary Callahan	31	Essex-County, New Jersey	New Jersey	—	Wife
1930	Mary Callahan		Benton, Minnesota	Minnesota	—	Wife

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About Mary Callahan US Census Records & Model Tree

We've indexed 9329 free, proprietary US Census records for Mary Callahan across 1900–1950, covering 50 states and DC: Alabama, Alaska, 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 9329 US Census records for Mary Callahan, from 1900 to 1950, across 50 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 Callahan'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 Callahan 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 Callahan records from the 1900 through 1950 US Federal Census, across 50 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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