How many William Blair census records do you have?

We have 6021 US Census records for William Blair, from 1900 to 1950, across 50 states and DC.

What's in a William Blair census record?

You'll see William'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 William 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 William Blair census records free?

Yes. All William 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 William Blair?

We have William Blair 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 William 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 William 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.

William Blair — US Census Records & Model Tree

We found 6021 free census records for William Blair across 6 census years (1900–1950), in 50 states and DC and 1323 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

William Blair Census Records by State & County

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Showing of 6021 records for William Blair US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	William H Blair		Wayne, Michigan	Michigan	Instructor	Son
1940	William Blair	21	Morgan-County, Kentucky	Kentucky	—	Son
1930	William L. Blair		Venango, Pennsylvania	Pennsylvania	None	Son
1940	William Hardy Blair	27	Marion-County, Kentucky	Kentucky	Labor	Head
1920	William H. J. Blair		Charles, Maryland	Maryland	Laborer	Son
1940	William R. Blair	40	Reno-County, Kansas	Kansas	Manager	Head
1930	William F. Blair		Franklin, Georgia	Georgia	Farmer	Head
1940	William Blair	33	Cambria-County, Pennsylvania	Pennsylvania	Laborer	Son
1920	William Blair		Passaic, New Jersey	Scotland	Bookkeeper	Head
1910	William H Blair		Davidson, Tennessee	Tennessee	Farmer	Head
1910	William Blair		Washington, Tennessee	Tennessee	Farm Laborer	Head
1930	William L Blair		Bradley, Tennessee	Tennessee	Farmer	Head
1920	William Blair		Charles, Maryland	Maryland	Laborer	Head
1940	William H Blair	53	Beckham-County, Oklahoma	Texas	Farmer	Head
1940	William H. Blair	73	Davidson-County, Tennessee	Tennessee	Farmer	Head
1940	William Blair	36	Wyandotte-County, Kansas	Texas	Laborer	Head
1920	William N. Blair		Philadelphia, Pennsylvania	New Jersey	Painter	Head
1920	William H Blair		Mercer, Pennsylvania	Pennsylvania	Carpenter	Head
1930	William G. Blair		Bradley, Arkansas	Louisiana	Farmer	Head
1930	William A. Blair		Washington, Vermont	Vermont	Laborer	Head
1940	William Blair	67	Hampden-County, Massachusetts	New York	—	Head
1930	William M Blair		Sedgwick, Kansas	Illinois	Farmer	Head
1930	William W. Blair		York, South Carolina	South Carolina	Farmer	Head
1920	William Blair		Pittsylvania, Virginia	Virginia	Broom Mfgr	Son
1930	William Blair		Clarion, Pennsylvania	Pennsylvania	None	Head
1940	William Blair	15	Allegheny-County, Pennsylvania	Pennsylvania	—	Son
1910	William L Blair		Bradford, Florida	Florida	Farmer	Head
1940	William J Blair	25	Middlesex-County, Massachusetts	Massachusetts	Mechanic	Son
1940	William Blair	11	Orleans-County, Louisiana	Louisiana	—	Son
1930	William H. Blair		Franklin, Kansas	Kansas	Farmer	Head

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About William Blair US Census Records & Model Tree

We've indexed 6021 free, proprietary US Census records for William Blair 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 William 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 6021 US Census records for William Blair, from 1900 to 1950, across 50 states and DC.
: You'll see William'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 William 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 William 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 William Blair 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.