How many John Blair census records do you have?

We have 6614 US Census records for John Blair, from 1900 to 1950, across 50 states and DC.

What's in a John Blair census record?

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

Yes. All John 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 John Blair?

We have John 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 John 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 John 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.

John Blair — US Census Records & Model Tree

We found 6614 free census records for John Blair across 6 census years (1900–1950), in 50 states and DC and 1447 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Blair Census Records by State & County

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Showing of 6614 records for John Blair US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	John J. Blair		Douglas, Georgia	Georgia	Farmer	Son
1940	John Blair	22	Elbert-County, Georgia	Georgia	Laborer	Son
1920	John T Blair		Cullman, Alabama	Georgia	Farmer	Head
1920	John Blair		Queens, New York	Scotland	Secretary	Head
1930	John E. Blair		Cumberland, Pennsylvania	Pennsylvania	Salesman	Son
1940	John B. Blair	22	Davidson-County, Tennessee	Tennessee	Machine Operator	Head
1940	John T Blair	58	Loudon-County, Tennessee	Tennessee	Farmer	Head
1930	John G. Blair		Essex, New Jersey	Scotland	Shipping Clerk	Head
1920	John Blair		Reno, Kansas	Kentucky	Farmer	Head
1930	John C. Blair		Monroe, Michigan	Michigan	Farmer	Head
1930	John H Blair		Jo Daviess, Illinois	Illinois	Farmer	Head
1920	John H Blair		Marshall, Kansas	Pennsylvania	Farmer	Head
1940	John A. B. Blair	54	Wabash-County, Illinois	Illinois	Boiler Maker	Head
1920	John D Blair		Crawford, Pennsylvania	Pennsylvania	Farmer	Head
1940	John E. Blair	55	Wayne-County, Michigan	Kansas	Teacher	Head
1940	John P Blair	73	Highland-County, Ohio	Ohio	Farmer	Head
1920	John Blair		Union, North Carolina	North Carolina	—	Head
1940	John H. Blair	74	Middlesex-County, Massachusetts	New Hampshire	—	Head
1940	John M. Blair	77	Davidson-County, Tennessee	Tennessee	—	Head
1920	John Blair		Lane, Oregon	Germany	Farmer	Head
1940	John M. Blair	68	Johnson-County, Kentucky	Kentucky	—	Head
1940	John Blair	20	Tulsa-County, Oklahoma	Oklahoma	Carpenter	Son
1920	John Blair		Bradley, Tennessee	Tennessee	Laborer	Son
1910	John H. Blair		Venango, Pennsylvania	Pennsylvania	Laborer	Head
1940	John H. Blair	40	Andrew-County, Missouri	Missouri	Farmer	Head
1930	John Walter Blair		Pike, Alabama	Alabama	—	Son
1940	John H. Blair	13	Andrew-County, Missouri	Missouri	—	Son
1910	John M. Blair		Searcy, Arkansas	Arkansas	Farmer	Head
1940	John Blair	13	Coffee-County, Alabama	Alabama	—	Son
1940	John Blair	44	Noxubee-County, Mississippi	Mississippi	Farmer	Head

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About John Blair US Census Records & Model Tree

We've indexed 6614 free, proprietary US Census records for John 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 John 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 6614 US Census records for John Blair, from 1900 to 1950, across 50 states and DC.
: You'll see John'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 John 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 John 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 John 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.