How many John Mcdermott census records do you have?

We have 8178 US Census records for John Mcdermott, from 1900 to 1950, across 49 states and DC.

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

Yes. All John Mcdermott 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 Mcdermott?

We have John Mcdermott 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 Mcdermott 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 Mcdermott?

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 Mcdermott — US Census Records & Model Tree

We found 8178 free census records for John Mcdermott across 6 census years (1900–1950), in 49 states and DC and 809 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Mcdermott Census Records by State & County

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Showing of 8178 records for John Mcdermott US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	John Mcdermott	33	Suffolk-County, Massachusetts	Massachusetts	Clerical	Son
1930	John Mcdermott		Kings, New York	New York	Operator	Son
1920	John Jr. Mcdermott		Marshall, West Virginia	West Virginia	None	Son
1930	John Mcdermott		Kings, New York	New York	Clerk	Head
1930	John Mcdermott		Hudson, New Jersey	New Jersey	—	Son
1940	John Mcdermott	24	Waseca-County, Minnesota	Minnesota	Sheet Metal Worker	Head
1930	John Mcdermott		Butler, Ohio	Ohio	Engineer	Head
1940	John Mcdermott	55	Westchester-County, New York	Ireland	Manager	Head
1930	John Mcdermott		Bronx, New York	Ireland	Chauffeur	Head
1920	John Mcdermott		Dutchess, New York	Ireland	Carpenter	Head
1920	John Mcdermott		Fayette, Pennsylvania	Ireland	None	Head
1940	John Mcdermott	69	Linn-County, Iowa	Ireland	Fireman	Head
1920	John Mcdermott		Allegheny, Pennsylvania	Ireland	Laborer	Head
1940	John Mcdermott	20	Allegheny-County, Pennsylvania	Pennsylvania	Laborer	Son
1940	John Mcdermott	63	Allegheny-County, Pennsylvania	Pennsylvania	Night Watch.	Head
1940	John Mcdermott	19	Monmouth-County, New Jersey	Georgia	—	Son
1930	John Mcdermott		Queens, New York	New York	Laborer	Son
1940	John Mcdermott	23	Suffolk-County, Massachusetts	Massachusetts	Dispatcher	Son
1940	John Mcdermott	25	Sullivan-County, New York	South Dakota	Laborer	Son
1910	John Mcdermott		Philadelphia, Pennsylvania	Ireland	Laborer	Head
1910	John Mcdermott		Pottawattamie, Iowa	Missouri	Laborer	Head
1940	John Mcdermott	46	Moultrie-County, Illinois	Illinois	Farmer	Head
1940	John Mcdermott	23	Cook-County, Illinois	Illinois	Helper	Son
1930	John Mcdermott		Kings, New York	New York	—	Son
1920	John Mcdermott		Montgomery, Pennsylvania	Pennsylvania	Salesman	Son
1910	John Mcdermott		New Castle, Delaware	Delaware	Laborer	Son
1920	John Mcdermott		Montgomery, Ohio	Ohio	—	Son
1910	John Mcdermott		Middlesex, Massachusetts	Ireland	Bricklayer	Head
1940	John J. Mcdermott	52	Suffolk-County, Massachusetts	Irish Free State	Candy Maker	Head
1920	John E Mcdermott		Custer, Nebraska	Nebraska	—	Son

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About John Mcdermott US Census Records & Model Tree

We've indexed 8178 free, proprietary US Census records for John Mcdermott 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 8178 US Census records for John Mcdermott, 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 Mcdermott'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 Mcdermott 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 Mcdermott 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.

Other Mcdermott US Census Records

James Mcdermott Margaret Mcdermott Mary Mcdermott Thomas Mcdermott William Mcdermott

All Mcdermott census records →

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