How many Mary Leonard census records do you have?

We have 10585 US Census records for Mary Leonard, from 1900 to 1950, across 50 states, DC, and 1 territory.

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

Yes. All Mary 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 Mary Leonard?

We have Mary 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 Mary 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 Mary 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.

Mary Leonard — US Census Records & Model Tree

We found 10585 free census records for Mary Leonard across 6 census years (1900–1950), in 50 states, DC, and 1 territory and 1375 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Leonard Census Records by State & County

Records per state:

Census Record Search

First Name

Middle Name

Last Name (Required)

Census Year

State

Birth Year

Year Range

Birthplace

Age From

Age To

Exact match: Name Location Year

Alternate First Names (comma-separated)

Alternate Last Names (comma-separated)

County

Sex

Marital Status

Race

Relationship to Head

Occupation

Census Page ID

Family Members (in same household)

Search Records

Showing of 10585 records for Mary Leonard US Census, ranked by Model Tree richness

No records match your filters.

Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Mary Leonard	30	Labette-County, Kansas	Kansas	Stenographer	Daughter
1930	Mary Leonard		Morris, New Jersey	New Jersey	Clerk	Daughter
1930	Mary Leonard		Shelby, Tennessee	Tennessee	—	Daughter
1920	Mary J. Leonard		Washington, Virginia	Virginia	—	Wife
1940	Mary Leonard	21	Cook-County, Illinois	Illinois	—	Daughter
1910	Mary E Leonard		Henrico, Virginia	Virginia	—	Daughter
1940	Mary Leonard	21	Hudson-County, New Jersey	New Jersey	Accountant	Daughter
1940	Mary A. Leonard	37	Suffolk-County, Massachusetts	Massachusetts	Bookkeeper	Daughter
1940	Mary Leonard	70	Kings-County, New York	Ireland	—	Wife
1920	Mary E. Leonard		Montrose, Colorado	Indiana	—	Wife
1940	Mary A Leonard	51	Jefferson-County, Kentucky	Kentucky	—	Wife
1920	Mary Leonard		New York, New York	Ireland	—	Wife
1920	Mary Leonard		Worcester, Massachusetts	Ireland	—	Head
1930	Mary J Leonard		Franklin, Ohio	Connecticut	None	Wife
1920	Mary Leonard		Providence, Rhode Island	Ireland	—	Head
1940	Mary Leonard	51	Montgomery-County, Ohio	Indiana	—	Wife
1940	Mary Leonard	38	Dougherty-County, Georgia	Alabama	Boarding House Keeper	Wife
1940	Mary (Mollie) Leonard	79	Dorchester-County, Maryland	Maryland	—	Head
1920	Mary G. Leonard		Allegheny, Pennsylvania	England	Music Teacher	Wife
1930	Mary Leonard		Kings, New York	Ireland	—	Wife
1940	Mary J. Leonard	72	Monmouth-County, New Jersey	New Jersey	—	Head
1930	Mary E. Leonard		Washington, Virginia	Virginia	—	Daughter
1940	Mary Leonard	17	Dent-County, Missouri	Missouri	Servant	Daughter
1920	Mary L. Leonard		Juniata, Pennsylvania	Pennsylvania	None	Daughter
1910	Mary Leonard		Luzerne, Pennsylvania	Pennsylvania	—	Wife
1940	Mary M. Leonard	11	Androscoggin-County, Maine	Maine	—	Daughter
1930	Mary E. Leonard		Oakland, Michigan	Michigan	None	Daughter
1930	Mary Leonard		Clay, Missouri	Missouri	—	Daughter
1920	Mary Leonard		Sacramento, California	California	—	Daughter
1940	Mary E. Leonard	28	Ouachita-County, Louisiana	Louisiana	—	Wife

Load More Mary Leonard Census Records

About Mary Leonard US Census Records & Model Tree

We've indexed 10585 free, proprietary US Census records for Mary Leonard 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, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, U.S. Virgin Islands, 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 10585 US Census records for Mary Leonard, 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 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 Mary 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 Mary 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.