How many John Mahoney census records do you have?

We have 8833 US Census records for John Mahoney, from 1900 to 1950, across 50 states, DC, and 1 territory.

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

Yes. All John Mahoney 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 Mahoney?

We have John Mahoney records from the 1900 through 1950 US Federal Census, across 50 states, DC, and 1 territory. Use the year and state filters to narrow your results.

How do I find John Mahoney 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 Mahoney?

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 Mahoney — US Census Records & Model Tree

We found 8833 free census records for John Mahoney across 6 census years (1900–1950), in 50 states, DC, and 1 territory and 803 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Mahoney Census Records by State & County

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Showing of 8833 records for John Mahoney US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	John Mahoney	36	Essex-County, Massachusetts	Massachusetts	Machinist	Son
1930	John A. Mahoney		Middlesex, Massachusetts	Massachusetts	Plasterer	Son
1940	John Mahoney	26	Bay-County, Michigan	Michigan	Clerk	Son
1940	John P. Mahoney	26	Cuyahoga-County, Ohio	Ohio	Baker	Son
1930	John Mahoney		Marion, Indiana	Nebraska	Printer	Son
1930	John A. Mahoney		Philadelphia, Pennsylvania	Pennsylvania	Lithographer	Son
1940	John Mahoney	29	Madison-County, Illinois	Illinois	Salesman	Son
1940	John F. Mahoney	22	Essex-County, Massachusetts	Massachusetts	—	Son
1930	John A. Mahoney		New York, New York	New York	Yes	Head
1940	John Mahoney	30	Cook-County, Illinois	Illinois	Checker	Son
1920	John Mahoney		Essex, Massachusetts	Massachusetts	Stenographer	Son
1930	John J. Mahoney		Will, Illinois	Illinois	Lawyer	Son
1930	John H Mahoney		Suffolk, Massachusetts	Massachusetts	Chauffeur	Son
1940	John J. @ Mahoney	32	Cascade-County, Montana	Montana	Farm Laborer	Son
1940	John Mahoney	52	Bay-County, Michigan	Michigan	Switchman	Head
1940	John Mahoney	57	Worcester-County, Massachusetts	Massachusetts	Clerk	Head
1940	John T. Mahoney	43	Worcester-County, Massachusetts	New Hampshire	Machine Tool Manufacturing Co	Head
1940	John H. Mahoney	68	Suffolk-County, Massachusetts	Massachusetts	Chief Engineer	Head
1940	John Mahoney	53	Woodbury-County, Iowa	England	Teacher Pub Sch	Head
1940	John Mahoney	57	Suffolk-County, Massachusetts	Mass	Fish Cutter	Head
1920	John T Mahoney		Crook, Wyoming	Iowa	Farmer	Head
1940	John B. Mahoney	46	Cedar-County, Iowa	Tennessee	Farmer	Head
1940	John Mahoney	65	St.-Louis-City-County, Missouri	Ireland	Motorman	Head
1940	John Mahoney	48	New-York-County, New York	Ireland	Superintendent	Head
1940	John D. Mahoney	53	Saginaw-County, Michigan	Michigan	Farmer	Head
1930	John E. Mahoney		Essex, New Jersey	New Jersey	Manager	Head
1930	John Mahoney		St Clair, Michigan	Michigan	Laborer	Head
1940	John W. Mahoney	12	Norfolk-County, Massachusetts	Massachusetts	—	Son
1940	John Jr. Mahoney	15	Cook-County, Illinois	Illinois	—	Son
1940	John Mahoney	44	New-York-County, New York	Irish Free State	Chauffeur	Head

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About John Mahoney US Census Records & Model Tree

We've indexed 8833 free, proprietary US Census records for John Mahoney across 1900–1950, covering 50 states, DC, and 1 territory: 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, Puerto Rico, 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 8833 US Census records for John Mahoney, from 1900 to 1950, across 50 states, DC, and 1 territory.
: 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 Mahoney'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 Mahoney 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 Mahoney records from the 1900 through 1950 US Federal Census, across 50 states, DC, and 1 territory. 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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