How many William Mcgrath census records do you have?

We have 4449 US Census records for William Mcgrath, from 1900 to 1950, across 50 states and DC.

What's in a William Mcgrath census record?

You'll see William'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 William 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 William Mcgrath census records free?

Yes. All William 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 William Mcgrath?

We have William 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 William 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 William 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.

William Mcgrath — US Census Records & Model Tree

We found 4449 free census records for William Mcgrath across 6 census years (1900–1950), in 50 states and DC and 575 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

William Mcgrath Census Records by State & County

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Showing of 4449 records for William Mcgrath US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	William J. Mcgrath	22	Middlesex-County, Massachusetts	Massachusetts	Salesman	Son
1940	William Mcgrath	26	Kings-County, New York	New York	Porter	Son
1940	William Mcgrath	23	New-York-County, New York	New York	Counter Man	Son
1930	William Mcgrath		New York, New York	New York	Electrician	Son
1940	William, Jr. Mcgrath	26	Richmond-County, New York	New York	House Man	Son
1920	William Mcgrath		Ada, Idaho	Idaho	—	Son
1930	William Mcgrath		Camden, New Jersey	New Jersey	Policeman	Head
1930	William F. Mcgrath		Essex, Massachusetts	Massachusetts	Truck Driver	Son
1940	William Mcgrath	57	Champaign-County, Illinois	Indiana	Millwright	Head
1930	William Mcgrath		New York, New York	New York	Laborer	Head
1940	William Mcgrath	13	Oakland-County, Michigan	Michigan	—	Son
1920	William Mcgrath		New York, New York	New York	—	Son
1940	William Mcgrath	21	Suffolk-County, Massachusetts	Massachusetts	C.C.C. Project	Son
1930	William H. Mcgrath		Calumet, Wisconsin	Wisconsin	Farming	Son
1930	William F. Mcgrath		Chittenden, Vermont	Vermont	—	Son
1930	William J. Mcgrath		Plymouth, Massachusetts	Massachusetts	Chauffeur	Son
1930	William J Mcgrath		Suffolk, Massachusetts	Massachusetts	Book Binder	Head
1930	William Mcgrath		New York, New York	New York	Operator	Head
1920	William Mcgrath		New York, New York	New York	Driver	Son
1940	William Mcgrath	13	Westchester-County, New York	New York	—	Son
1920	William F Mcgrath		Essex, Massachusetts	Massachusetts	Locker	Son
1930	William Mcgrath		New York, New York	Ireland	Butcher	Head
1940	William Mcgrath	20	St.-Lawrence-County, New York	New York	Helper In Remelt No 2	Son
1930	William J. Mcgrath		Butler, Ohio	Ohio	Salesman	Son
1920	William J. Mcgrath		Allegheny, Pennsylvania	Massachusetts	Machinist	Son
1940	William A Mcgrath	18	Clearfield-County, Pennsylvania	PENNSYLVANIA	New Worker	Son
1930	William Mcgrath		New York, New York	New York	—	Son
1910	William C Mcgrath		Anoka, Minnesota	Canada Eng	Lumberman	Son
1930	William Mcgrath		Kings, New York	New York	Chauffeur	Son
1940	William Q. Mcgrath	43	Wayne-County, Michigan	Connecticut	Salesman Paper Products	Head

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About William Mcgrath US Census Records & Model Tree

We've indexed 4449 free, proprietary US Census records for William 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 William 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 4449 US Census records for William Mcgrath, from 1900 to 1950, across 50 states and DC.
: You'll see William'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 William 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 William 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 William 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.

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