How many Mary Clark census records do you have?

We have 42510 US Census records for Mary Clark, from 1900 to 1950, across 50 states, DC, and 1 territory.

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

Yes. All Mary Clark 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 Clark?

We have Mary Clark records from the 1900 through 1950 US Federal Census, across 50 states, DC, and 1 territory. Use the year and state filters to narrow your results.

How do I find Mary Clark 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 Clark?

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 Clark — US Census Records & Model Tree

We found 42510 free census records for Mary Clark across 6 census years (1900–1950), in 50 states, DC, and 1 territory and 2678 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Clark Census Records by State & County

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Showing of 42510 records for Mary Clark US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	Mary G. Clark		Essex, New York	New York	—	Daughter
1940	Mary A. Clark	21	Camden-County, New Jersey	New Jersey	—	Son
1940	Mary Clark	19	Terrell-County, Georgia	Georgia	Laborer	Daughter
1930	Mary E. Clark		Genesee, Michigan	Michigan	Saleslady	Daughter
1940	Mary Clark	25	Vigo-County, Indiana	Indiana	—	Wife
1920	Mary E. Clark		Windham, Vermont	Vermont	—	Daughter
1930	Mary R. Clark		Essex, Massachusetts	Massachusetts	—	Daughter
1930	Mary A Clark		Lucas, Iowa	Iowa	Nurse	Daughter
1940	Mary Clark	20	Hampden-County, Massachusetts	Massachusetts	—	Daughter
1940	Mary F. Clark	21	Los-Angeles-County, California	California	Stenographer	Daughter
1940	Mary Clark	48	Ramsey-County, Minnesota	Iowa	Private-Secretary	Daughter
1940	Mary R. Clark	25	Plymouth-County, Massachusetts	Massachusetts	Carder Operator	Daughter
1940	Mary C. Clark	30	Oneida-County, New York	New York	—	Daughter
1920	Mary A. Clark		Middlesex, Massachusetts	Maine	Binder	Daughter
1910	Mary Clark		Fayette, Pennsylvania	Scotland	None	Wife
1910	Mary Clark		Halifax, North Carolina	North Carolina	Farm Laborer	Wife
1940	Mary Clark	40	Humphreys-County, Mississippi	Mississippi	—	Wife
1930	Mary Clark		New York, New York	Ireland	Housewife	Wife
1920	Mary A. Clark		Franklin, Kansas	Virginia	—	Wife
1920	Mary A. Clark		Hennepin, Minnesota	Wisconsin	—	Wife
1940	Mary E. Clark	52	Linn-County, Oregon	Nebraska	—	Head
1910	Mary Clark		Genesee, Michigan	Michigan	—	Wife
1940	Mary Clark	57	Cook-County, Illinois	Ireland	—	Wife
1920	Mary Clark		New York, New York	Scotland	None	Wife
1940	Mary Clark	48	Providence-County, Rhode Island	Scotland	—	Wife
1920	Mary Clark		Essex, New Jersey	England	—	Wife
1940	Mary S. Clark	67	Middlesex-County, Massachusetts	Vermont	—	Wife
1940	Mary Clark	72	Ramsey-County, Minnesota	Minnesota	—	Wife
1940	Mary A. Clark	79	Avery-County, North Carolina	North Carolina	—	Head
1940	Mary Clark	62	Edgefield-County, South Carolina	South Carolina	—	Wife

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About Mary Clark US Census Records & Model Tree

We've indexed 42510 free, proprietary US Census records for Mary Clark across 1900–1950, covering 50 states, DC, and 1 territory: 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, Puerto Rico, 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 42510 US Census records for Mary Clark, from 1900 to 1950, across 50 states, DC, and 1 territory.
: 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 Clark'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 Clark 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 Clark records from the 1900 through 1950 US Federal Census, across 50 states, DC, and 1 territory. 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.