How many Mary Frey census records do you have?

We have 3627 US Census records for Mary Frey, from 1900 to 1950, across 44 states and DC.

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

Yes. All Mary Frey 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 Frey?

We have Mary Frey records from the 1900 through 1950 US Federal Census, across 44 states and DC. Use the year and state filters to narrow your results.

How do I find Mary Frey 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 Frey?

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 Frey — US Census Records & Model Tree

We found 3627 free census records for Mary Frey across 6 census years (1900–1950), in 44 states and DC and 748 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Frey Census Records by State & County

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Showing of 3627 records for Mary Frey US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	Mary A Frey		Cowley, Kansas	Kansas	—	Daughter
1940	Mary Elizabeth Frey	21	Jefferson-County, Kentucky	Kentucky	—	Daughter
1930	Mary E Frey		Frederick, Maryland	Nebraska	—	Wife
1940	Mary Frey	66	Kings-County, New York	Germany	Teacher	Head
1930	Mary Frey		Bronx, New York	Austria	—	Wife
1940	Mary Frey	77	Scioto-County, Ohio	Ohio	—	Head
1930	Mary Frey		Knox, Indiana	Indiana	None	Daughter
1940	Mary Frey	20	Racine-County, Wisconsin	Wisconsin	Nurse	Daughter
1910	Mary Frey		Bond, Illinois	Illinois	—	Wife
1930	Mary Ellen Frey		York, Pennsylvania	Pennsylvania	None	Daughter
1930	Mary Frey		Franklin, Ohio	Ohio	—	Daughter
1930	Mary Frey		Jefferson, Kentucky	Indiana	None	Wife
1910	Mary Frey		Clinton, Michigan	Michigan	—	Daughter
1930	Mary Jas Frey		Robertson, Tennessee	Tennessee	None	Daughter
1940	Mary L. Frey	33	Los-Angeles-County, California	Wyoming	—	Wife
1910	Mary Frey		Mason, West Virginia	West Virginia	—	Daughter
1900	Mary Frey	8	Craven, North Carolina	North Carolina	—	Daughter
1930	Mary Frey		Auglaize, Ohio	Ohio	—	Daughter
1940	Mary Frey	10	Daviess-County, Kentucky	Kentucky	—	Daughter
1930	Mary Frey		Marion, Indiana	Indiana	Clerk	Daughter
1900	Mary Frey	30	Kings, New York	New York	—	Wife
1940	Mary Frey	12	Madison-County, Illinois	Illinois	—	Daughter
1940	Mary Helen Frey	30	Orleans-County, Louisiana	Louisiana	Typist	Daughter
1900	Mary A. Frey	2	Wyandot, Ohio	Ohio	—	Daughter
1940	Mary G. Frey	16	Union-County, Iowa	Iowa	—	Daughter
1930	Mary Frey		Alameda, California	California	—	Wife
1930	Mary M. Frey		Fulton, Georgia	Georgia	—	Daughter
1900	Mary A. Frey	41	Milwaukee, Wisconsin	Germany	—	Wife
1940	Mary Frey	48	Queens-County, New York	New York	Worker + Cleaner	Wife
1920	Mary A. Frey		Cuyahoga, Ohio	Ohio	—	Daughter

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About Mary Frey US Census Records & Model Tree

We've indexed 3627 free, proprietary US Census records for Mary Frey across 1900–1950, covering 44 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, New Hampshire, New Jersey, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, 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 3627 US Census records for Mary Frey, from 1900 to 1950, across 44 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 Frey'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 Frey 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 Frey records from the 1900 through 1950 US Federal Census, across 44 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.