How many John Irwin census records do you have?

We have 3682 US Census records for John Irwin, from 1900 to 1950, across 50 states and DC.

What's in a John Irwin 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 Irwin'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 Irwin census records free?

Yes. All John Irwin 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 Irwin?

We have John Irwin 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 Irwin 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 Irwin?

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 Irwin — US Census Records & Model Tree

We found 3682 free census records for John Irwin across 6 census years (1900–1950), in 50 states and DC and 921 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Irwin Census Records by State & County

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Showing of 3682 records for John Irwin US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	John Irwin	36	Middlesex-County, Massachusetts	New York	Salesman	Son
1940	John A. Irwin	60	Essex-County, Massachusetts	Vermont	R.R. Ex. Agent	Head
1940	John C Irwin	49	Calcasieu-County, Louisiana	Missouri	Machinist	Head
1940	John Irwin	44	Bronx-County, New York	Ireland	Fireman	Head
1940	John Irwin	51	Sullivan-County, Indiana	Indiana	Laborer	Head
1940	John W. Irwin	19	Franklin-County, Ohio	Ohio	Laborer	Son
1940	John Irwin	22	Knox-County, Tennessee	Tennessee	Pressman	Son
1940	John Irwin	12	Philadelphia-County, Pennsylvania	Pennsylvania	—	Son
1910	John L. Irwin		Washington, Pennsylvania	Pennsylvania	Pumper	Head
1940	John R. Irwin	14	Armstrong-County, Pennsylvania	Pennsylvania	—	Son
1910	John M Irwin		Morris, Kansas	Indiana	Farmer	Head
1940	John Irwin	12	Oakland-County, Michigan	Michigan	—	Son
1940	John K. Irwin	16	Oakland-County, Michigan	Michigan	Paper Boy	Son
1910	John Irwin		Kings, New York	New York	Salesman	Head
1940	John Irwin	40	Oakland-County, Michigan	Indiana	Machinist	Head
1910	John Irwin		Washington, Georgia	Georgia	Farmer	Head
1910	John Irwin		Hardin, Ohio	Ohio	Laborer	Son
1940	John W. Irwin	47	Montgomery-County, Ohio	Indiana	Plant Engineer	Head
1940	John Q. Irwin	73	Franklin-County, Ohio	Ohio	—	Head
1940	John E. Irwin	40	Washington-County, Oklahoma	West Virginia	Garage Mech	Head
1940	John E Irwin	12	Pickaway-County, Ohio	Ohio	—	Son
1940	John E. Jr. Irwin	18	Cook-County, Illinois	Illinois	—	Son
1940	John, J. Irwin	53	Hudson-County, New Jersey	New Jersey	Police Lieutenant	Head
1930	John O Irwin		Pike, Ohio	Ohio	Foreman	Head
1930	John F. Irwin		Cook, Illinois	Newfoundland	Sign Painter	Head
1940	John Irwin	11	Allegheny-County, Pennsylvania	Pennsylvania	—	Son
1940	John Irwin	11	New-Castle-County, Delaware	Maryland	—	Son
1930	John R Irwin		Licking, Ohio	Ohio	Laborer	Son
1940	John Irwin	47	Oakland-County, Michigan	England	Salesman	Head
1940	John Irwin	28	Camden-County, New Jersey	New Jersey	Coal Truck	Son

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About John Irwin US Census Records & Model Tree

We've indexed 3682 free, proprietary US Census records for John Irwin 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 3682 US Census records for John Irwin, 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 Irwin'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 Irwin 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 Irwin 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.

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