How many Mary Shannon census records do you have?

We have 5097 US Census records for Mary Shannon, from 1900 to 1950, across 49 states and DC.

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

Yes. All Mary Shannon 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 Shannon?

We have Mary Shannon 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 Shannon 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 Shannon?

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 Shannon — US Census Records & Model Tree

We found 5097 free census records for Mary Shannon across 6 census years (1900–1950), in 49 states and DC and 1009 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Shannon Census Records by State & County

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Showing of 5097 records for Mary Shannon US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Mary E. Shannon	68	Knox-County, Tennessee	Tennessee	—	Wife
1940	Mary I. Shannon	69	Belknap-County, New Hampshire	New Hampshire	—	Wife
1940	Mary Shannon	59	Queens-County, New York	Ireland	—	Wife
1940	Mary Shannon	73	Hamilton-County, Ohio	Kentucky	—	Head
1930	Mary Alice Shannon		Jackson, Missouri	Missouri	Stenographer	Daughter
1920	Mary Shannon		St Clair, Illinois	Illinois	Shipping Clerk	Daughter
1910	Mary Shannon		Sheridan, Nebraska	Nebraska	—	Daughter
1940	Mary L. Shannon	36	Westmoreland-County, Pennsylvania	Penna	—	Wife
1940	Mary Shannon	10	Wayne-County, Michigan	Michigan	—	Daughter
1940	Mary Shannon	48	Kings-County, New York	Irish Free State	—	Wife
1940	Mary Shannon	48	Baltimore-City-County, Maryland	Maryland	—	Wife
1940	Mary E. Shannon	12	Jefferson-County, Colorado	Colorado	—	Daughter
1940	Mary Shannon	33	Middlesex-County, Massachusetts	Irish Free State	—	Wife
1940	Mary E. Shannon	33	Tift-County, Georgia	Alabama	Farm	Wife
1940	Mary Shannon	49	Essex-County, New Jersey	New Jersey	—	Wife
1940	Mary Shannon	53	San-Francisco-County, California	Irish Free State	—	Wife
1910	Mary Shannon		Philadelphia, Pennsylvania	Ireland	—	Wife
1900	Mary M Shannon	26	St Lawrence, New York	Canada Eng	—	Wife
1920	Mary E Shannon		Merrimack, New Hampshire	New Hampshire	—	Daughter
1940	Mary Lou Shannon	16	Kenosha-County, Wisconsin	Wisconsin	—	Daughter
1940	Mary Shannon	27	Philadelphia-County, Pennsylvania	Georgia	Laborer	Wife
1930	Mary J. Shannon		New London, Connecticut	Virginia	—	Wife
1910	Mary Shannon		St Clair, Illinois	Illinois	—	Wife
1940	Mary Jane Shannon	18	Ramsey-County, Minnesota	Minnesota	—	Daughter
1940	Mary H. Shannon	40	Maricopa-County, Arizona	Michigan	—	Wife
1920	Mary A Shannon		Chautauqua, New York	Kentucky	—	Daughter
1910	Mary Shannon		Middlesex, Massachusetts	Ireland	—	Wife
1940	Mary Shannon	11	Providence-County, Rhode Island	Rhode Island	—	Daughter
1940	Mary Shannon	65	Suffolk-County, Massachusetts	Syria	—	Wife
1940	Mary E Shannon	35	Logan-County, Kentucky	Kentucky	—	Wife

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About Mary Shannon US Census Records & Model Tree

We've indexed 5097 free, proprietary US Census records for Mary Shannon across 1900–1950, covering 49 states and DC: Alabama, 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, 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 5097 US Census records for Mary Shannon, 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 Shannon'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 Shannon 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 Shannon 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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