How many Mary Nichols census records do you have?

We have 10323 US Census records for Mary Nichols, from 1900 to 1950, across 50 states, DC, and 1 territory.

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

Yes. All Mary Nichols 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 Nichols?

We have Mary Nichols 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 Nichols 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 Nichols?

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 Nichols — US Census Records & Model Tree

We found 10323 free census records for Mary Nichols across 6 census years (1900–1950), in 50 states, DC, and 1 territory and 1795 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Nichols Census Records by State & County

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Showing of 10323 records for Mary Nichols US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	Mary B Nichols		Darlington, South Carolina	South Carolina	—	Daughter
1940	Mary Nichols	33	Fulton-County, Georgia	New Hampshire	Treasurer	Daughter
1940	Mary Nichols	33	Nemaha-County, Nebraska	Nebraska	—	Daughter
1940	Mary Jane Nichols	21	Ohio-County, West Virginia	West Virginia	School Teacher	Daughter
1940	Mary Ella Nichols	33	Saluda-County, South Carolina	South Carolina	—	Daughter
1920	Mary F. Nichols		Windham, Vermont	Vermont	—	Wife
1920	Mary E Nichols		Middlesex, Massachusetts	Massachusetts	—	Head
1930	Mary Nichols		Tuscarawas, Ohio	Italy	—	Wife
1940	Mary Nichols	53	Philadelphia-County, Pennsylvania	Scotland	—	Wife
1920	Mary A. Nichols		Brown, Minnesota	Minnesota	—	Wife
1940	Mary A. Nichols	63	Cass-County, Missouri	Missouri	Farmer	Wife
1940	Mary Nichols	53	Philadelphia-County, Pennsylvania	Maryland	—	Wife
1930	Mary Nichols		Middlesex, Massachusetts	Greece	—	Wife
1940	Mary Nichols	58	Boone-County, Missouri	Missouri	—	Wife
1930	Mary A Nichols		Worcester, Massachusetts	Maine	Nurse	Head
1940	Mary A Nichols	58	Wapello-County, Iowa	Illinois	—	Wife
1940	Mary Nichols	66	Floyd-County, Georgia	Georgia	—	Head
1940	Mary Nichols	85	Luzerne-County, Pennsylvania	England	—	Head
1940	Mary L. Nichols	47	Providence-County, Rhode Island	Rhode Island	—	Wife
1910	Mary H. Nichols		Bristol, Rhode Island	Rhode Island	None	Head
1940	Mary L. Nichols	54	Richmond-City-County, Virginia	Virginia	Saleslady	Head
1930	Mary E Nichols		Knox, Illinois	North Dakota	—	Daughter
1910	Mary Nichols		Marion, South Carolina	South Carolina	Farm Laborer	Daughter
1940	Mary Nichols	17	Delaware-County, Pennsylvania	Maryland	Housework	Daughter
1940	Mary Nichols	13	Fayette-County, West Virginia	West Virginia	—	Daughter
1930	Mary Nichols		Leflore, Mississippi	Mississippi	—	Wife
1940	Mary Nichols	50	Jackson-County, Florida	Alabama	—	Wife
1940	Mary Nichols	15	Franklin-County, Virginia	Virginia	—	Daughter
1940	Mary Nichols	16	Sumter-County, South Carolina	South Carolina	0	Daughter
1930	Mary E Nichols		Newton, Mississippi	Mississippi	Laborer	Daughter

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About Mary Nichols US Census Records & Model Tree

We've indexed 10323 free, proprietary US Census records for Mary Nichols 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, Puerto Rico, 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 10323 US Census records for Mary Nichols, 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 Nichols'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 Nichols 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 Nichols 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.