How many John Leary census records do you have?

We have 3499 US Census records for John Leary, from 1900 to 1950, across 49 states and DC.

What's in a John Leary 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 Leary'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 Leary census records free?

Yes. All John Leary 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 Leary?

We have John Leary 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 John Leary 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 Leary?

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 Leary — US Census Records & Model Tree

We found 3499 free census records for John Leary across 6 census years (1900–1950), in 49 states and DC and 499 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Leary Census Records by State & County

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Showing of 3499 records for John Leary US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	John Leary		Bertie, North Carolina	North Carolina	Farm Labor	Son
1940	John Leary	31	Hudson-County, New Jersey	New Jersey	—	Head
1920	John J Leary		Bertie, North Carolina	North Carolina	Farmer	Head
1940	John Leary	54	Chester-County, Pennsylvania	Pennsylvania	Farmer	Head
1920	John Leary		Plymouth, Massachusetts	Massachusetts	Gardner	Head
1920	John Leary		New York, New York	Ireland	Laborer	Head
1940	John M. Leary	18	Middlesex-County, Massachusetts	Massachusetts	Houseboy	Son
1940	John F. Leary	20	Allegheny-County, Pennsylvania	Pennsylvania	Student	Son
1940	John J. Leary	55	Suffolk-County, Massachusetts	Massachusetts	Fireman	Head
1940	John J Leary	30	Middlesex-County, Massachusetts	Massachusetts	Clerk Meat Store	Son
1910	John Leary		New Castle, Delaware	Delaware	—	Son
1910	John W. Leary		Worcester, Massachusetts	Ireland	Machinist	Head
1940	John A Leary	69	Solano-County, California	California	—	Head
1920	John J. Leary		New Haven, Connecticut	Ireland	Fireman	Head
1910	John J Leary		Merrimack, New Hampshire	New Hampshire	Teamster	Head
1940	John Leary	24	Montgomery-County, Pennsylvania	Pennsylvania	Painter	Son
1940	John G Leary	17	Solano-County, California	California	—	Son
1910	John Leary		Orleans, Louisiana	Louisiana	Baker	Son
1940	John Leary	11	Suffolk-County, Massachusetts	Massachusetts	—	Son
1910	John Leary		Camden, North Carolina	North Carolina	Laborer	Son
1930	John Leary		Allegheny, Pennsylvania	Pennsylvania	None	Son
1940	John Leary	32	Westchester-County, New York	New York	Stenographer	Son
1940	John Jr Leary	13	Clark-County, Ohio	Ohio	—	Son
1930	John J. Leary		Philadelphia, Pennsylvania	Rhode Island	Pattern Stripper	Son
1910	John Leary		Queens, New York	England	Fireman	Head
1930	John Leary		Queens, New York	New York	—	Son
1930	John Leary		Indiana, Pennsylvania	Pennsylvania	Laborer	Son
1930	John Leary		Newport, Rhode Island	Rhode Island	—	Son
1910	John Leary		Luzerne, Pennsylvania	New York	Machinist	Head
1910	John Leary		Bristol, Massachusetts	Ireland	Labourer	Head

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About John Leary US Census Records & Model Tree

We've indexed 3499 free, proprietary US Census records for John Leary 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, 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, 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 3499 US Census records for John Leary, from 1900 to 1950, across 49 states and DC.
: 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 Leary'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 Leary 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 Leary 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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