How many John Leonard census records do you have?

We have 9671 US Census records for John Leonard, from 1900 to 1950, across 50 states, DC, and 1 territory.

What's in a John Leonard census record?

You'll see John'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 John Leonard'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 John Leonard census records free?

Yes. All John Leonard 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 John Leonard?

We have John Leonard 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 John Leonard 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 John Leonard?

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.

John Leonard — US Census Records & Model Tree

We found 9671 free census records for John Leonard across 6 census years (1900–1950), in 50 states, DC, and 1 territory and 1373 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Leonard Census Records by State & County

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Showing of 9671 records for John Leonard US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	John Leonard		Bristol, Massachusetts	Massachusetts	—	Son
1940	John Leonard	31	Allegheny-County, Pennsylvania	Pennsylvania	Mechanic	Head
1930	John H. Leonard		Orleans, Louisiana	Louisiana	Stableman	Head
1940	John Leonard	22	Suffolk-County, Massachusetts	Massachusetts	Helper	Son
1940	John Leonard	33	Luzerne-County, Pennsylvania	Pennsylvania	Coal Laborer	Head
1940	John Leonard	25	Stark-County, Ohio	Ohio	Salesman	Son
1940	John Leonard	34	Cook-County, Illinois	Illinois	Telephone Repairman	Head
1930	John W Leonard		Sheboygan, Wisconsin	Wisconsin	Laborer Farm	Son
1940	John Leonard	21	Rowan-County, North Carolina	North Carolina	Same Place	Head
1940	John H. Leonard	31	Sullivan-County, Tennessee	Tennessee	Plumber	Head
1930	John Leonard		Dauphin, Pennsylvania	Pennsylvania	—	Head
1930	John Leonard		New York, New York	Ireland	Retired	Head
1940	John P. Leonard	47	Providence-County, Rhode Island	Rhode Island	Captain	Head
1910	John Leonard		Middlesex, Massachusetts	Ireland	Laborer	Head
1930	John S. Leonard		Custer, Nebraska	Ireland	Farmer	Head
1920	John H. Leonard		Providence, Rhode Island	Rhode Island	Foreman	Head
1920	John Leonard		Union, New Jersey	Poland	Packer	Head
1940	John Leonard	48	Multnomah-County, Oregon	Minnesota	Boiler Maker	Head
1940	John Leonard	60	Washington-County, Virginia	Virginia	Labor	Head
1940	John Leonard	53	King-County, Washington	Colorado	Machinist	Head
1920	John M. Leonard		Chatham, North Carolina	North Carolina	Farmer	Head
1940	John D Leonard	51	Norfolk-County, Massachusetts	New Hampshire	Night Watchman	Head
1940	John H. Leonard	67	Jackson-County, Oklahoma	Virginia	Farmer	Head
1940	John H. Leonard	65	Blair-County, Pennsylvania	Pennsylvania	Brakeman	Head
1940	John J Leonard	56	Baltimore-City-County, Maryland	Maryland	Laborer	Head
1940	John S. Leonard	72	Rutland-County, Vermont	Vermont	Farmer	Head
1940	John T. Leonard	77	Hudson-County, New Jersey	Sweden	—	Head
1930	John L. Leonard		Washington, Virginia	Virginia	—	Son
1930	John Leonard		Addison, Vermont	Vermont	—	Son
1900	John Leonard	60	Philadelphia, Pennsylvania	Ireland	Laborer	Head

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About John Leonard US Census Records & Model Tree

We've indexed 9671 free, proprietary US Census records for John Leonard across 1900–1950, covering 50 states, DC, and 1 territory: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Guam, 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, 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 John 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 9671 US Census records for John Leonard, from 1900 to 1950, across 50 states, DC, and 1 territory.
: You'll see John'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 John Leonard'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 John Leonard 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 John Leonard 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.

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