How many Mary Underwood census records do you have?

We have 4287 US Census records for Mary Underwood, from 1900 to 1950, across 49 states and DC.

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

Yes. All Mary Underwood 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 Underwood?

We have Mary Underwood 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 Underwood 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 Underwood?

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 Underwood — US Census Records & Model Tree

We found 4287 free census records for Mary Underwood across 6 census years (1900–1950), in 49 states and DC and 1176 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Underwood Census Records by State & County

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Showing of 4287 records for Mary Underwood US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Mary Ella Underwood	20	Perry-County, Alabama	Alabama	Laborer	Daughter
1910	Mary S. Underwood		Allegheny, Pennsylvania	Pennsylvania	—	Daughter
1930	Mary J Underwood		Effingham, Georgia	Georgia	Farmer	Head
1940	Mary Underwood	30	Barbour-County, Alabama	Alabama	—	Wife
1930	Mary Underwood		Fulton, Georgia	Georgia	None	Wife
1930	Mary J. Underwood		Alleghany, Virginia	West Virginia	Farmer	Head
1920	Mary A Underwood		Washington, Pennsylvania	England	None	Wife
1940	Mary Underwood	67	Webster-County, Iowa	Iowa	—	Wife
1920	Mary A Underwood		Bexar, Texas	Arkansas	None	Wife
1920	Mary E Underwood		Macon, Illinois	Illinois	—	Head
1920	Mary J. Underwood		Moody, South Dakota	New Hampshire	—	Head
1910	Mary Underwood		Greene, Alabama	Alabama	Laborer	Daughter
1940	Mary Louise Underwood	20	Jefferson-County, Kentucky	Kentucky	Library Assistant	Daughter
1940	Mary C. Underwood	14	Collingsworth-County, Texas	Texas	—	Daughter
1940	Mary Underwood	32	Bullock-County, Alabama	Alabama	—	Wife
1910	Mary Underwood		Decatur, Kansas	Missouri	None	Wife
1920	Mary Underwood		Cooke, Texas	Texas	None	Daughter
1920	Mary Underwood		Douglas, Kansas	Kansas	—	Daughter
1930	Mary Eth L Underwood		Grady, Georgia	Georgia	—	Daughter
1930	Mary K Underwood		None, None	Georgia	Laborer	Daughter
1910	Mary Underwood		Tyler, West Virginia	West Virginia	—	Daughter
1910	Mary Underwood		Christian, Kentucky	Kentucky	—	Daughter
1910	Mary Underwood		Carter, Kentucky	Kentucky	—	Daughter
1940	Mary Underwood	18	Stanly-County, North Carolina	North Carolina	Secretary	Daughter
1910	Mary B Underwood		Franklin, Virginia	Virginia	—	Daughter
1910	Mary E Underwood		Tyler, West Virginia	Ohio	—	Wife
1940	Mary Underwood	39	Butler-County, Ohio	Kentucky	H	Wife
1940	Mary Ruth Underwood	12	Jessamine-County, Kentucky	Kentucky	—	Daughter
1920	Mary Underwood		Lee, North Carolina	North Carolina	Farm Laborer	Daughter
1930	Mary Underwood		Washington, Pennsylvania	Pennsylvania	—	Daughter

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About Mary Underwood US Census Records & Model Tree

We've indexed 4287 free, proprietary US Census records for Mary Underwood 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 4287 US Census records for Mary Underwood, 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 Underwood'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 Underwood 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 Underwood 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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