How many Margaret Callahan census records do you have?

We have 3599 US Census records for Margaret Callahan, from 1900 to 1950, across 48 states and DC.

What's in a Margaret Callahan census record?

You'll see Margaret'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 Margaret 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 Margaret Callahan census records free?

Yes. All Margaret 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 Margaret Callahan?

We have Margaret Callahan 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 Margaret 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 Margaret 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.

Margaret Callahan — US Census Records & Model Tree

We found 3599 free census records for Margaret Callahan across 6 census years (1900–1950), in 48 states and DC and 504 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Margaret Callahan Census Records by State & County

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Showing of 3599 records for Margaret Callahan US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Margaret Callahan	21	New-York-County, New York	New York	—	Daughter
1930	Margaret A Callahan		Bergen, New Jersey	New Jersey	—	Daughter
1940	Margaret Callahan	30	Kings-County, New York	New York	—	Wife
1940	Margaret V. Callahan	27	Kings-County, New York	New York	Lab. Clerk	Daughter
1940	Margaret Callahan	31	Bronx-County, New York	New York	—	Wife
1940	Margaret Callahan	25	Middlesex-County, Massachusetts	At Sea	Reg. Nurse	Daughter
1940	Margaret Callahan	28	Bronx-County, New York	New York	Tele. Operator	Daughter
1940	Margaret Callahan	20	Tulsa-County, Oklahoma	Oklahoma	—	Daughter
1940	Margaret Callahan	45	Hudson-County, New Jersey	New York	40	Daughter
1920	Margaret Callahan		Essex, Massachusetts	Ireland	—	Wife
1920	Margaret Callahan		New York, New York	New York	—	Wife
1920	Margaret Callahan		Philadelphia, Pennsylvania	Ireland	None	Wife
1920	Margaret Callahan		New York, New York	Ireland	None	Head
1940	Margaret Callahan	64	Saratoga-County, New York	New York	—	Head
1940	Margaret Callahan	64	New-York-County, New York	New York	—	Head
1940	Margaret Callahan	72	Providence-County, Rhode Island	Rhode Island	—	Head
1930	Margaret Callahan		Kings, New York	Ireland	—	Head
1940	Margaret Callahan	13	Cook-County, Illinois	Michigan	—	Daughter
1920	Margaret Callahan		Fayette, Pennsylvania	Pennsylvania	—	Daughter
1930	Margaret Callahan		Hudson, New Jersey	New York	Operator	Daughter
1940	Margaret H. Callahan	46	Talbot-County, Maryland	Maryland	—	Wife
1920	Margaret Callahan		Norfolk, Massachusetts	Massachusetts	—	Daughter
1940	Margaret Callahan	17	Allen-County, Indiana	Indiana	—	Daughter
1930	Margaret Callahan		Cook, Illinois	Illinois	—	Daughter
1930	Margaret Callahan		None, New York	Ireland	Demonstrator	Wife
1940	Margaret Callahan	68	Richmond-County, New York	Irish Free State	—	Head
1940	Margaret M. Callahan	31	Middlesex-County, Massachusetts	Massachusetts	—	Wife
1920	Margaret Callahan		Monmouth, New Jersey	New Jersey	—	Daughter
1930	Margaret Callahan		Crawford, Missouri	Missouri	—	Daughter
1930	Margaret Callahan		Morris, New Jersey	Ireland	—	Wife

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About Margaret Callahan US Census Records & Model Tree

We've indexed 3599 free, proprietary US Census records for Margaret Callahan across 1900–1950, covering 48 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, 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 Margaret 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 3599 US Census records for Margaret Callahan, from 1900 to 1950, across 48 states and DC.
: You'll see Margaret'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 Margaret 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 Margaret 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 Margaret Callahan 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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