How many Mary Klein census records do you have?

We have 4554 US Census records for Mary Klein, from 1900 to 1950, across 47 states and DC.

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

Yes. All Mary Klein 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 Klein?

We have Mary Klein records from the 1900 through 1950 US Federal Census, across 47 states and DC. Use the year and state filters to narrow your results.

How do I find Mary Klein 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 Klein?

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 Klein — US Census Records & Model Tree

We found 4554 free census records for Mary Klein across 6 census years (1900–1950), in 47 states and DC and 671 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

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Showing of 4554 records for Mary Klein US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1910	Mary Klein		New York, New York	Hungary	—	Wife
1940	Mary Jane Klein	22	Orleans-County, Louisiana	Louisiana	Stenographer	Daughter
1940	Mary Klein	49	New-York-County, New York	Hungary	0	Head
1920	Mary Klein		New York, New York	Hungary	None	Wife
1930	Mary Klein		Cook, Illinois	Indiana	—	Wife
1900	Mary Klein	44	New York, New York	Hungary	Laundress	Head
1940	Mary Klein	44	Wayne-County, Michigan	Michigan	—	Wife
1940	Mary Klein	45	Bronx-County, New York	Hungary	—	Wife
1940	Mary Klein	46	Philadelphia-County, Pennsylvania	Austria	Seamstress	Wife
1930	Mary Klein		Cook, Illinois	Hungary	—	Wife
1940	Mary Klein	59	Cook-County, Illinois	Hungary	—	Wife
1940	Mary Klein	48	Bronx-County, New York	Austria	—	Wife
1940	Mary Klein	57	New-York-County, New York	Hungary	—	Wife
1940	Mary Klein	65	St.-Louis-County, Missouri	Illinois	—	Wife
1940	Mary Klein	40	New-York-County, New York	Hungary	Operator	Head
1930	Mary Klein		Philadelphia, Pennsylvania	Germany	None	Head
1930	Mary Klein		Hudson, New Jersey	New Jersey	—	Daughter
1940	Mary Klein	13	Hettinger-County, North Dakota	North Dakota	—	Daughter
1940	Mary Klein	39	Baltimore-City-County, Maryland	Maryland	—	Wife
1940	Mary Klein	11	Outagamie-County, Wisconsin	Wisconsin	—	Daughter
1940	Mary Klein	58	Jefferson-County, Kentucky	Kentucky	—	Wife
1930	Mary A Klein		Bronx, New York	New York	—	Wife
1910	Mary Klein		New York, New York	Austria	Saleslady	Daughter
1940	Mary Klein	44	Moody-County, South Dakota	Luxemburg	—	Wife
1940	Mary Klein	23	Cook-County, Illinois	Illinois	Coil-Winder	Daughter
1940	Mary Klein	11	Marshall-County, Illinois	Illinois	—	Daughter
1930	Mary A Klein		Queens, New York	New York	—	Wife
1920	Mary Klein		Morton, North Dakota	Austria	—	Wife
1940	Mary E. Klein	19	Clinton-County, Michigan	Michigan	—	Daughter
1930	Mary Klein		Queens, New York	New York	—	Daughter

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About Mary Klein US Census Records & Model Tree

We've indexed 4554 free, proprietary US Census records for Mary Klein across 1900–1950, covering 47 states and DC: Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, 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, 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 4554 US Census records for Mary Klein, from 1900 to 1950, across 47 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 Klein'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 Klein 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 Klein records from the 1900 through 1950 US Federal Census, across 47 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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