How many Mary Spencer census records do you have?

We have 8578 US Census records for Mary Spencer, from 1900 to 1950, across 50 states and DC.

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

Yes. All Mary Spencer 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 Spencer?

We have Mary Spencer records from the 1900 through 1950 US Federal Census, across 50 states and DC. Use the year and state filters to narrow your results.

How do I find Mary Spencer 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 Spencer?

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 Spencer — US Census Records & Model Tree

We found 8578 free census records for Mary Spencer across 6 census years (1900–1950), in 50 states and DC and 1544 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Spencer Census Records by State & County

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Showing of 8578 records for Mary Spencer US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Mary Spencer	22	Jackson-County, Illinois	Illinois	—	Daughter
1920	Mary Spencer		Jefferson, Alabama	Alabama	None	Daughter
1940	Mary I Spencer	27	Pierce-County, Washington	Washington	Student Nurse	Daughter
1930	Mary P Spencer		Linn, Missouri	Missouri	None	Daughter
1930	Mary Spencer		Pottawattamie, Iowa	Iowa	—	Daughter
1940	Mary M. Spencer	39	Albany-County, New York	New York	—	Daughter
1940	Mary Spencer	32	Wabash-County, Illinois	Illinois	Clerk In Dress Shop	Daughter
1920	Mary Spencer		New York, New York	Ireland	—	Head
1940	Mary J. Spencer	48	Brooks-County, Georgia	Georgia	—	Wife
1920	Mary Spencer		Saginaw, Michigan	Michigan	—	Wife
1920	Mary J. Spencer		Charlotte, Virginia	Virginia	None	Wife
1930	Mary Spencer		Bristol, Massachusetts	England	None	Head
1920	Mary Spencer		Washington, Pennsylvania	Pennsylvania	—	Head
1940	Mary V. Spencer	73	Los-Angeles-County, California	Iowa	—	Head
1940	Mary R Spencer	60	Wilcox-County, Alabama	Alabama	Laborer	Wife
1920	Mary Spencer		Mobile, Alabama	Alabama	Laundress	Wife
1940	Mary E. Spencer	72	Sussex-County, Delaware	Delaware	—	Wife
1920	Mary Spencer		Kanawha, West Virginia	West Virginia	—	Wife
1940	Mary E. Spencer	68	Nowata-County, Oklahoma	Kansas	—	Head
1940	Mary Spencer	78	Salt-Lake-County, Utah	England	Gardner	Head
1940	Mary E. Spencer	56	Hampden-County, Massachusetts	England	—	Head
1930	Mary Spencer		Henry, Virginia	Virginia	Laborer	Daughter
1930	Mary L. Spencer		Catawba, North Carolina	North Carolina	None	Daughter
1920	Mary Spencer		Lincoln, Louisiana	Louisiana	—	Daughter
1930	Mary Sue Spencer		Nelson, Virginia	Virginia	—	Son
1900	Mary J Spencer	49	Armstrong, Pennsylvania	Pennsylvania	—	Wife
1930	Mary Spencer		Wythe, Virginia	Virginia	—	Daughter
1940	Mary Spencer	18	Grant-County, Indiana	Indiana	New Worker	Daughter
1920	Mary Ann Spencer		Grayson, Virginia	Virginia	—	Daughter
1940	Mary E Spencer	13	Beaufort-County, North Carolina	North Carolina	—	Daughter

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About Mary Spencer US Census Records & Model Tree

We've indexed 8578 free, proprietary US Census records for Mary Spencer across 1900–1950, covering 50 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, 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 8578 US Census records for Mary Spencer, from 1900 to 1950, across 50 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 Spencer'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 Spencer 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 Spencer records from the 1900 through 1950 US Federal Census, across 50 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.