How many John Mcgrath census records do you have?

We have 9261 US Census records for John Mcgrath, from 1900 to 1950, across 50 states and DC.

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

Yes. All John Mcgrath 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 Mcgrath?

We have John Mcgrath 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 Mcgrath 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 Mcgrath?

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 Mcgrath — US Census Records & Model Tree

We found 9261 free census records for John Mcgrath across 6 census years (1900–1950), in 50 states and DC and 765 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Mcgrath Census Records by State & County

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Showing of 9261 records for John Mcgrath US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	John, Sr. Mcgrath	52	Mercer-County, New Jersey	New Jersey	Laborer	Head
1930	John Mcgrath		Lackawanna, Pennsylvania	Pennsylvania	—	Son
1940	John L Mcgrath	21	Peoria-County, Illinois	Illinois	Laborer	Son
1940	John Mcgrath	21	Bucks-County, Pennsylvania	Pennsylvania	40	Son
1930	John H. Mcgrath		Essex, Massachusetts	Massachusetts	Machinist	Son
1940	John Mcgrath	31	Schuylkill-County, Pennsylvania	Pennsylvania	Laborer	Son
1930	John Mcgrath		Philadelphia, Pennsylvania	Pennsylvania	Chauffeur	Son
1940	John Mcgrath	43	Luzerne-County, Pennsylvania	Pennsylvania	Laborer	Head
1900	John Mcgrath	55	Philadelphia, Pennsylvania	Ireland	Contractor	Head
1920	John Mcgrath		Shelby, Illinois	Ireland	Farmer	Head
1930	John Mcgrath		New York, New York	Ireland	Salesman	Head
1920	John Mcgrath		Norfolk, Massachusetts	Ireland	Hostler	Head
1920	John Mcgrath		Essex, New Jersey	Ireland	Watchman	Head
1940	John Mcgrath	54	Westchester-County, New York	Ireland	—	Head
1940	John D Mcgrath	48	Mitchell-County, Kansas	Kansas	Farming	Head
1940	John F. Mcgrath	63	Orleans-County, Louisiana	New Jersey	Clerical Work	Head
1940	John J. Mcgrath	66	San-Mateo-County, California	Ireland	Commissioner	Head
1940	John Mcgrath	71	Kings-County, New York	Ireland	—	Head
1930	John Mcgrath		Kings, New York	Ireland	Night Supt.	Head
1940	John X Mcgrath	68	Clearfield-County, Pennsylvania	Ireland	Coal Mines	Head
1920	John Mcgrath		Kings, New York	New York	—	Son
1920	John D Mcgrath		Wright, Iowa	Iowa	—	Son
1930	John Mcgrath		Hudson, New Jersey	New Jersey	Laborer	Son
1940	John Mcgrath	17	Essex-County, New Jersey	New Jersey	—	Son
1940	John Mcgrath	11	Denver-County, Colorado	Colorado	—	Son
1920	John Mcgrath		New York, New York	New York	—	Son
1940	John Mcgrath	18	Luzerne-County, Pennsylvania	Pennsylvania	—	Son
1940	John Mcgrath	17	Philadelphia-County, Pennsylvania	Penna	New Worker	Son
1920	John Mcgrath		Providence, Rhode Island	Rhode Island	Tool Maker	Son
1910	John Mcgrath		Worcester, Massachusetts	Ireland	Machinist	Head

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About John Mcgrath US Census Records & Model Tree

We've indexed 9261 free, proprietary US Census records for John Mcgrath 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 9261 US Census records for John Mcgrath, 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 Mcgrath'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 Mcgrath 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 Mcgrath 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.

Other Mcgrath US Census Records

James Mcgrath Margaret Mcgrath Mary Mcgrath Thomas Mcgrath William Mcgrath

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