How many Mary William census records do you have?

We have 4612 US Census records for Mary William, from 1900 to 1950, across 49 states and DC.

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

Yes. All Mary William 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 William?

We have Mary William records from the 1900 through 1950 US Federal Census, across 49 states and DC. Use the year and state filters to narrow your results.

How do I find Mary William 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 William?

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 William — US Census Records & Model Tree

We found 4612 free census records for Mary William across 6 census years (1900–1950), in 49 states and DC and 1359 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary William Census Records by State & County

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Showing of 4612 records for Mary William US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	Mary William		Wayne, Michigan	Scotland	None	Wife
1940	Mary William	62	Shelby-County, Tennessee	Tennessee	—	Wife
1940	Mary William	44	Cleveland-County, Oklahoma	Oklahoma	—	Head
1930	Mary B William		Pittsylvania, Virginia	Virginia	—	Daughter
1930	Mary William		Pitt, North Carolina	North Carolina	None	Son
1910	Mary William		Jefferson, Florida	Florida	Laborer	Wife
1930	Mary B William		Bossier, Louisiana	Louisiana	—	Daughter
1930	Mary L William		Wayne, Michigan	Michigan	—	Daughter
1940	Mary E. William	13	Wyandotte-County, Kansas	Kansas	—	Daughter
1940	Mary Ann William	14	Philadelphia-County, Pennsylvania	Delaware	—	Daughter
1930	Mary L. William		Washington, Georgia	Georgia	—	Daughter
1940	Mary William	46	Westchester-County, New York	Scotland	—	Wife
1930	Mary William		Essex, New Jersey	New Jersey	—	Daughter
1930	Mary William		Plymouth, Massachusetts	Italy	—	Head
1930	Mary Frances William		Robeson, North Carolina	North Carolina	—	Daughter
1910	Mary William		San Jacinto, Texas	Texas	Farm Laborer	Wife
1940	Mary William	44	Bronx-County, New York	Canada-English	Bookkeeper	Daughter
1900	Mary M. William	68	St Louis, Missouri	Kentucky	—	Wife
1930	Mary William		Denver, Colorado	Colorado	—	Wife
1930	Mary William		Box Elder, Utah	Utah	—	Wife
1940	Mary William	50	Baltimore-City-County, Maryland	Maryland	Tailor	Daughter
1930	Mary L. William		Lee, Georgia	Georgia	None	Daughter
1930	Mary William		Hillsborough, Florida	Florida	Servant	Wife
1930	Mary M William		Baltimore, Maryland	Maryland	—	Daughter
1930	Mary William		New York, New York	Irish Free State	Housewife	Wife
1910	Mary H. William		Williamson, Tennessee	Tennessee	—	Daughter
1940	Mary A. William	16	Tulsa-County, Oklahoma	Oklahoma	—	Daughter
1940	Mary William	46	Orange-County, Florida	Florida	—	Wife
1900	Mary A William	43	Venango, Pennsylvania	England	—	Head
1920	Mary William		Philadelphia, Pennsylvania	Maryland	—	Wife

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About Mary William US Census Records & Model Tree

We've indexed 4612 free, proprietary US Census records for Mary William across 1900–1950, covering 49 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, 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 4612 US Census records for Mary William, from 1900 to 1950, across 49 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 William'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 William 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 William records from the 1900 through 1950 US Federal Census, across 49 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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