How many Mary Blair census records do you have?

We have 6433 US Census records for Mary Blair, from 1900 to 1950, across 48 states and DC.

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

Yes. All Mary Blair 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 Blair?

We have Mary Blair records from the 1900 through 1950 US Federal Census, across 48 states and DC. Use the year and state filters to narrow your results.

How do I find Mary Blair 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 Blair?

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 Blair — US Census Records & Model Tree

We found 6433 free census records for Mary Blair across 6 census years (1900–1950), in 48 states and DC and 1419 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Blair Census Records by State & County

Records per state:

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Showing of 6433 records for Mary Blair US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1910	Mary A Blair		Cayuga, New York	New York	—	Daughter
1930	Mary L Blair		Lancaster, South Carolina	South Carolina	Farm Laborer	Daughter
1940	Mary Blair	22	Baltimore-County, Maryland	Maryland	Stenographer	Daughter
1930	Mary Lou Blair		Wayne, Michigan	Michigan	—	Daughter
1940	Mary L Blair	67	Douglas-County, Georgia	Georgia	Housewife	Wife
1940	Mary Blair	48	Davidson-County, Tennessee	Tennessee	Laundress	Wife
1930	Mary Blair		Davidson, Tennessee	Tennessee	—	Wife
1940	Mary Blair	51	Guilford-County, North Carolina	North Carolina	—	Head
1920	Mary Blair		Charles, Maryland	Maryland	None	Wife
1940	Mary Blair	57	Berkshire-County, Massachusetts	Connecticut	—	Head
1920	Mary M. Blair		Butler, Kansas	Ohio	—	Wife
1920	Mary Blair		Wayne, Michigan	Canada	—	Wife
1940	Mary Blair	75	Erie-County, Pennsylvania	Scotland	—	Head
1920	Mary N. Blair		Anderson, South Carolina	South Carolina	Farm Laborer	Daughter
1930	Mary Blair		Philadelphia, Pennsylvania	Pennsylvania	Operator	Daughter
1930	Mary Z. Blair		Guilford, North Carolina	North Carolina	None	Daughter
1940	Mary Blair	42	Orleans-County, Louisiana	Louisiana	—	Wife
1930	Mary A. Blair		Johnson, Kentucky	Kentucky	—	Wife
1940	Mary Blair	17	Rabun-County, Georgia	Georgia	—	Daughter
1940	Mary S Blair	47	Middlesex-County, Massachusetts	Massachusetts	—	Wife
1910	Mary E. Blair		Lee, Iowa	Illinois	—	Wife
1930	Mary E. Blair		Johnson, Kentucky	Kentucky	None	Daughter
1930	Mary E. Blair		St Louis, Missouri	Kentucky	—	Wife
1940	Mary Ann Blair	29	Lake-County, Indiana	Missouri	—	Wife
1940	Mary Blair	16	Dallas-County, Texas	Texas	—	Daughter
1930	Mary Blair		Lee, Mississippi	Mississippi	None	Daughter
1910	Mary Blair		Allen, Ohio	Ohio	—	Daughter
1910	Mary Blair		Knox, Tennessee	Tennessee	—	Wife
1940	Mary Blair	48	Clay-County, Mississippi	Mississippi	Laborer	Wife
1920	Mary Blair		None, None	Kentucky	None	Wife

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About Mary Blair US Census Records & Model Tree

We've indexed 6433 free, proprietary US Census records for Mary Blair across 1900–1950, covering 48 states and DC: Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, 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 6433 US Census records for Mary Blair, from 1900 to 1950, across 48 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 Blair'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 Blair 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 Blair records from the 1900 through 1950 US Federal Census, across 48 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.