How many Mary Nicholson census records do you have?

We have 4245 US Census records for Mary Nicholson, from 1900 to 1950, across 50 states and DC.

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

Yes. All Mary Nicholson 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 Nicholson?

We have Mary Nicholson 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 Nicholson 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 Nicholson?

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 Nicholson — US Census Records & Model Tree

We found 4245 free census records for Mary Nicholson across 6 census years (1900–1950), in 50 states and DC and 1003 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Nicholson Census Records by State & County

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Showing of 4245 records for Mary Nicholson US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Mary Nicholson	21	Blair-County, Pennsylvania	Pennsylvania	—	Daughter
1910	Mary Nicholson		Warrick, Indiana	Indiana	—	Daughter
1940	Mary E. Nicholson	25	Martin-County, North Carolina	North Carolina	—	Wife
1940	Mary Nicholson	75	Middlesex-County, Massachusetts	Scotland	—	Wife
1940	Mary Nicholson	79	Jefferson-County, Kentucky	Kentucky	—	Head
1940	Mary E. Nicholson	13	Noxubee-County, Mississippi	Mississippi	—	Daughter
1930	Mary G Nicholson		Tuscaloosa, Alabama	Alabama	—	Daughter
1930	Mary Nicholson		Cook, Illinois	Illinois	Typist	Daughter
1940	Mary J. Nicholson	12	Greene-County, Mississippi	Mississippi	—	Daughter
1910	Mary Nicholson		Richmond, North Carolina	North Carolina	—	Wife
1940	Mary H Nicholson	14	Clay-County, Missouri	Missouri	—	Daughter
1910	Mary E. Nicholson		Doddridge, West Virginia	West Virginia	None	Wife
1940	Mary Bell Nicholson	17	Owen-County, Kentucky	Kentucky	—	Daughter
1940	Mary Nicholson	19	Hamilton-County, Indiana	Indiana	—	Daughter
1920	Mary D. Nicholson		Robeson, North Carolina	North Carolina	Laborer	Wife
1920	Mary Nicholson		Choctaw, Alabama	Alabama	—	Wife
1930	Mary Nicholson		Wayne, Michigan	England	—	Wife
1940	Mary C. Nicholson	20	Cumberland-County, New Jersey	New Jersey	Private Secretary	Daughter
1920	Mary Nicholson		Middlesex, Massachusetts	Massachusetts	Machine Operator	Daughter
1930	Mary Nicholson		Madison, Virginia	Virginia	—	Wife
1940	Mary R. Nicholson	15	Suffolk-County, Massachusetts	Massachusetts	—	Daughter
1900	Mary Nicholson	14	Bristol, Massachusetts	England	At School	Daughter
1930	Mary E. Nicholson		Washington, Missouri	Missouri	None	Wife
1910	Mary Nicholson		Phillips, Arkansas	Mississippi	—	Daughter
1910	Mary A Nicholson		Kings, New York	New York	—	Daughter
1940	Mary Nicholson	52	Nassau-County, New York	Ireland	—	Wife
1940	Mary Lou Nicholson	11	Rock-Island-County, Illinois	Illinois	—	Daughter
1940	Mary Nicholson	14	Baltimore-City-County, Maryland	Maryland	—	Daughter
1940	Mary A. Nicholson	35	Middlesex-County, Massachusetts	Canada-English	Dressmaker	Wife
1940	Mary Nicholson	48	Nodaway-County, Missouri	Missouri	—	Wife

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About Mary Nicholson US Census Records & Model Tree

We've indexed 4245 free, proprietary US Census records for Mary Nicholson 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 4245 US Census records for Mary Nicholson, 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 Nicholson'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 Nicholson 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 Nicholson 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.