How many John Mccormack census records do you have?

We have 2819 US Census records for John Mccormack, from 1900 to 1950, across 49 states and DC.

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

Yes. All John Mccormack 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 Mccormack?

We have John Mccormack 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 Mccormack 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 Mccormack?

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 Mccormack — US Census Records & Model Tree

We found 2819 free census records for John Mccormack across 6 census years (1900–1950), in 49 states and DC and 478 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Mccormack Census Records by State & County

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Showing of 2819 records for John Mccormack US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	John Jr Mccormack	22	Kenton-County, Kentucky	Kentucky	Time Study Man	Son
1910	John Mccormack		Erie, Pennsylvania	Pennsylvania	None	Son
1940	John B. Mccormack	38	San-Francisco-County, California	California	Conductor	Head
1940	John C. Mccormack	49	Hampshire-County, Massachusetts	Vermont	—	Head
1930	John Mccormack		Essex, New Jersey	New Jersey	Operator	Son
1940	John Jr. Mccormack	31	Allegheny-County, Pennsylvania	Pennsylvania	Clerk	Son
1900	John Mccormack	31	New York, New York	Ireland	Printer	Head
1930	John Mccormack		Bronx, New York	Ireland	—	Head
1940	John M. Mccormack	49	Queens-County, New York	Ireland	Apprentice Engineer	Head
1900	John Mccormack	62	Philadelphia, Pennsylvania	Ireland	Farm Laborer	Head
1940	John Mccormack	53	New-York-County, New York	Ireland	Laborer	Head
1920	John Mccormack		Saginaw, Michigan	Michigan	Farmer	Head
1900	John Mccormack	45	Kings, New York	Ireland	Dairy Salesman	Head
1930	John Mccormack		New York, New York	Ireland	Fireman	Head
1920	John Mccormack		Kings, New York	Ireland	—	Head
1930	John F Mccormack		Bronx, New York	New York	Accountant	Head
1900	John Mccormack	39	Logan, Oklahoma	Ireland	Farmer	Head
1940	John Mccormack	22	Suffolk-County, Massachusetts	Massachusetts	—	Son
1900	John N Mccormack	13	Logan, Oklahoma	Kansas	—	Son
1910	John Mccormack		Monmouth, New Jersey	New Jersey	Farmer	Son
1940	John Mccormack	14	Essex-County, Massachusetts	Massachusetts	—	Son
1930	John R. Mccormack		St Louis, Missouri	Missouri	—	Son
1940	John Mccormack	49	Kenton-County, Kentucky	Kentucky	Switchman	Head
1940	John J. Mccormack	43	New-Haven-County, Connecticut	New York	Policeman	Head
1920	John F. Mccormack		Essex, New Jersey	New Jersey	Plumber	Son
1930	John Mccormack		Lackawanna, Pennsylvania	Pennsylvania	Labour	Son
1930	John Mccormack		Luzerne, Pennsylvania	Pennsylvania	Yardmaster	Son
1910	John Mccormack		Bristol, Massachusetts	Massachusetts	—	Son
1930	John J. Mccormack		Hudson, New Jersey	New Jersey	—	Head
1910	John Mccormack		Suffolk, Massachusetts	Massachusetts	Printing	Son

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About John Mccormack US Census Records & Model Tree

We've indexed 2819 free, proprietary US Census records for John Mccormack across 1900–1950, covering 49 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 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 2819 US Census records for John Mccormack, 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 Mccormack'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 Mccormack 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 Mccormack 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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