How many Mary Cooper census records do you have?

We have 17867 US Census records for Mary Cooper, from 1900 to 1950, across 50 states and DC.

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

Yes. All Mary Cooper 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 Cooper?

We have Mary Cooper 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 Cooper 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 Cooper?

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 Cooper — US Census Records & Model Tree

We found 17867 free census records for Mary Cooper across 6 census years (1900–1950), in 50 states and DC and 2163 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Cooper Census Records by State & County

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Showing of 17867 records for Mary Cooper US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1910	Mary Cooper		Lawrence, Mississippi	Mississippi	—	Daughter
1940	Mary Cooper	23	Franklin-County, Ohio	Ohio	Fill Operator	Daughter
1930	Mary Cooper		Marion, Indiana	Indiana	—	Daughter
1940	Mary Cooper	52	Williamsburg-County, South Carolina	South Carolina	—	Wife
1940	Mary Cooper	44	Monona-County, Iowa	Iowa	—	Wife
1930	Mary Cooper		Essex, New Jersey	New Jersey	—	Wife
1930	Mary E. Cooper		Clarendon, South Carolina	South Carolina	Teacher	Wife
1940	Mary M. Cooper	46	Kent-County, Delaware	Delaware	—	Wife
1940	Mary Cooper	48	Mercer-County, New Jersey	New Jersey	—	Wife
1940	Mary Cooper	35	Williamsburg-County, South Carolina	South Carolina	—	Wife
1930	Mary Cooper		Kings, New York	New York	—	Head
1940	Mary J. Cooper	87	Hancock-County, Kentucky	Arkansas	—	Head
1940	Mary E. Cooper	60	Carter-County, Kentucky	Kentucky	—	Wife
1940	Mary L. Cooper	59	Essex-County, New Jersey	Massachusetts	—	Wife
1940	Mary Cooper	72	Pottawatomie-County, Kansas	Ohio	—	Wife
1940	Mary Cooper	64	Perry-County, Ohio	Ohio	—	Wife
1940	Mary Cooper	63	Franklin-County, Ohio	Wales	—	Head
1920	Mary Cooper		Bristol, Massachusetts	England	Cotton Mill	Wife
1940	Mary Cooper	46	Bronx-County, New York	Connecticut	—	Wife
1920	Mary Cooper		Jackson, Missouri	Kansas	—	Wife
1940	Mary O. Cooper	48	Bristol-County, Massachusetts	England	—	Wife
1940	Mary A. Cooper	66	Wayne-County, Michigan	Michigan	—	Wife
1940	Mary Cooper	55	Scioto-County, Ohio	Kentucky	—	Wife
1940	Mary E. Cooper	61	Columbia-County, Oregon	Kansas	—	Wife
1940	Mary J Cooper	40	Hillsborough-County, Florida	Florida	—	Wife
1940	Mary M. Cooper	45	Bertie-County, North Carolina	North Carolina	—	Wife
1940	Mary Cooper	70	Union-County, New Jersey	New Jersey	—	Head
1940	Mary Cooper	78	Monroe-County, New York	New York	—	Head
1940	Mary E. Cooper	72	Vigo-County, Indiana	Illinois	—	Head
1910	Mary Cooper		Nassau, Florida	Florida	—	Wife

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About Mary Cooper US Census Records & Model Tree

We've indexed 17867 free, proprietary US Census records for Mary Cooper 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 17867 US Census records for Mary Cooper, 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 Cooper'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 Cooper 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 Cooper 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.