How many John Cahill census records do you have?

We have 4261 US Census records for John Cahill, from 1900 to 1950, across 49 states and DC.

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

Yes. All John Cahill 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 Cahill?

We have John Cahill records from the 1900 through 1950 US Federal Census, across 49 states and DC. Use the year and state filters to narrow your results.

How do I find John Cahill 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 Cahill?

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 Cahill — US Census Records & Model Tree

We found 4261 free census records for John Cahill across 6 census years (1900–1950), in 49 states and DC and 545 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Cahill Census Records by State & County

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Showing of 4261 records for John Cahill US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	John, Jr Cahill	20	Maricopa-County, Arizona	Arizona	Carpenter	Son
1940	John Cahill	32	Bronx-County, New York	New York	Doctor	Head
1940	John Cahill	30	Suffolk-County, Massachusetts	Massachusetts	Salesman	Son
1940	John T. Cahill	33	Middlesex-County, Massachusetts	Rhode Island	Shipping Clerk	Head
1920	John F Cahill		Merrimack, New Hampshire	New Hampshire	Commercial	Son
1940	John Cahill	45	Nassau-County, New York	Ireland	Manager	Head
1940	John J. Al. Cahill	59	Allegheny-County, Pennsylvania	England	Stenographer	Head
1940	John Cahill	60	Preble-County, Ohio	Ohio	Farmer	Head
1920	John Cahill		Providence, Rhode Island	Rhode Island	Laborer	Head
1940	John J. Cahill	19	Middlesex-County, Massachusetts	Massachusetts	Laborer	Son
1940	John J. Cahill	41	Kenton-County, Kentucky	Kentucky	Foreman	Head
1940	John Jr Cahill	18	Philadelphia-County, Pennsylvania	Pennsylvania	—	Son
1910	John B. Cahill		Hillsborough, New Hampshire	New Hampshire	Presser	Son
1910	John Cahill		Linn, Iowa	Iowa	Farmer	Head
1930	John Cahill		Essex, New Jersey	New Jersey	Draftsman	Son
1940	John F. Cahill	55	New-York-County, New York	Irish Free State	Clerk	Head
1930	John Cahill		Maricopa, Arizona	Mexico	Truck Driver	Head
1940	John Cahill	16	Philadelphia-County, Pennsylvania	Pennsylvania	—	Son
1910	John Cahill		Essex, Massachusetts	Canada	Watchman	Head
1940	John Cahill	20	Nassau-County, New York	New York	Runner	Son
1940	John Cahill	46	Bronx-County, New York	Ireland	Helper	Head
1940	John R Cahill	42	Swift-County, Minnesota	Minnesota	Shoveler	Head
1930	John Cahill		New York, New York	New York	Clerk	Son
1940	John Cahill	58	Rock-County, Wisconsin	Iowa	Baker	Head
1940	John Cahill	13	Suffolk-County, Massachusetts	Massachusetts	—	Son
1940	John Cahill	14	Franklin-County, Massachusetts	Massachusetts	—	Son
1910	John Cahill		Kings, New York	Ireland	Boiler Maker	Head
1940	John H. Cahill	15	Norfolk-County, Massachusetts	Florida	—	Son
1930	John Cahill		Teller, Colorado	Kentucky	Farmer	Head
1940	John Cahill	12	Kings-County, New York	New York	—	Son

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About John Cahill US Census Records & Model Tree

We've indexed 4261 free, proprietary US Census records for John Cahill across 1900–1950, covering 49 states and DC: Alabama, Alaska, 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 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 4261 US Census records for John Cahill, from 1900 to 1950, across 49 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 Cahill'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 Cahill 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 Cahill records from the 1900 through 1950 US Federal Census, across 49 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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