How many William Lyon census records do you have?

We have 2870 US Census records for William Lyon, from 1900 to 1950, across 49 states and DC.

What's in a William Lyon census record?

You'll see William'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 William Lyon'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 William Lyon census records free?

Yes. All William Lyon 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 William Lyon?

We have William Lyon 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 William Lyon 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 William Lyon?

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.

William Lyon — US Census Records & Model Tree

We found 2870 free census records for William Lyon across 6 census years (1900–1950), in 49 states and DC and 850 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

William Lyon Census Records by State & County

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Showing of 2870 records for William Lyon US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1900	William Lyon	10	Henrico, Virginia	Virginia	At School	Son
1930	William F. Lyon		Yakima, Washington	Washington	Clerk	Son
1910	William H Lyon		Edgecombe, North Carolina	North Carolina	Farm Laborer	Son
1930	William Lyon		Durham, North Carolina	North Carolina	None	Son
1900	William S. Lyon	3	Kings, New York	New York	—	Son
1940	William Lyon	21	Hudson-County, New Jersey	New Jersey	Wood Turner	Son
1930	William W Lyon		Washington, Pennsylvania	Pennsylvania	Steam Shovel Craneman	Head
1940	William Lyon	37	Duval-County, Florida	Mississippi	Electrical	Son
1930	William Ab Lyon		Cherokee, Kansas	Missouri	—	Son
1930	William E. Lyon		Worcester, Massachusetts	Massachusetts	None	Head
1940	William M Lyon	55	Cook-County, Illinois	Illinois	Proprietor	Head
1940	William Jr. Lyon	14	Warren-County, Pennsylvania	Pennsylvania	—	Son
1900	William H. Lyon	44	Madison, Iowa	Iowa	Farmer	Head
1920	William Lyon		Edgecombe, North Carolina	North Carolina	—	Son
1940	William P. Lyon	44	Jefferson-County, Kentucky	Kentucky	Department Manager	Head
1920	William C. Jr. Lyon		Durham, North Carolina	North Carolina	Salesman	Son
1900	William R. Lyon	16	Middlesex, Massachusetts	Massachusetts	At School	Son
1910	William H. Lyon		Martin, Indiana	Indiana	Carpenter	Head
1910	William Lyon		New York, New York	New York	Clerk	Son
1930	William W Lyon		Durham, North Carolina	North Carolina	—	Son
1930	William R. Sr. Lyon		Durham, North Carolina	North Carolina	Collector	Head
1940	William James Lyon	12	Falls-County, Texas	Texas	—	Son
1930	William E. Lyon		Elliott, Kentucky	Kentucky	Farmer	Head
1930	William Lyon		Hudson, New Jersey	New Jersey	Packer	Son
1900	William Lyon	29	Tallapoosa, Alabama	Alabama	—	Head
1910	William Lyon		Essex, New Jersey	New Jersey	Driver	Son
1940	William Lyon	16	Wayne-County, Michigan	Michigan	—	Son
1920	William D. Lyon		Shelby, Iowa	Iowa	None	Son
1940	William A. Lyon	35	Cherokee-County, Georgia	Georgia	Farming	Head
1910	William Lyon		Chautauqua, Kansas	Kentucky	Farmer	Head

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About William Lyon US Census Records & Model Tree

We've indexed 2870 free, proprietary US Census records for William Lyon across 1900–1950, covering 49 states and DC: Alabama, Alaska, 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, 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 William 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 2870 US Census records for William Lyon, from 1900 to 1950, across 49 states and DC.
: You'll see William'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 William Lyon'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 William Lyon 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 William Lyon 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.