How many William Mccarthy census records do you have?

We have 7402 US Census records for William Mccarthy, from 1900 to 1950, across 50 states and DC.

What's in a William Mccarthy 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 Mccarthy'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 Mccarthy census records free?

Yes. All William Mccarthy 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 Mccarthy?

We have William Mccarthy 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 Mccarthy 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 Mccarthy?

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 Mccarthy — US Census Records & Model Tree

We found 7402 free census records for William Mccarthy across 6 census years (1900–1950), in 50 states and DC and 681 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

William Mccarthy Census Records by State & County

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Showing of 7402 records for William Mccarthy US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	William A. Mccarthy	36	Middlesex-County, Massachusetts	Massachusetts	Truck Driver	Head
1940	William Mccarthy	25	Providence-County, Rhode Island	Rhode Island	Grocery Clerk	Son
1940	William H. Mccarthy	21	Los-Angeles-County, California	California	Laborer	Son
1930	William Mccarthy		Cook, Illinois	Illinois	Receiving Clerk	Son
1940	William Mccarthy	28	Oswego-County, New York	Connecticut	Fireman	Son
1920	William Mccarthy		Monroe, New York	New York	—	Son
1940	William F. Mccarthy	32	Denver-County, Colorado	Colorado	Dentist	Head
1940	William Mccarthy	42	Providence-County, Rhode Island	Rhode Island	Bookkeeper	Son
1940	William M Mccarthy	27	Silver-Bow-County, Montana	New Hampshire	Clerk	Son
1940	William Mccarthy	28	Middlesex-County, Massachusetts	Massachusetts	Clerk	Head
1940	William Mccarthy	28	Suffolk-County, Massachusetts	Massachusetts	Wrecker	Head
1920	William Mccarthy		Maricopa, Arizona	Texas	Farmer	Head
1920	William Mccarthy		Kings, New York	Newfoundland	Seaman	Head
1930	William A Mccarthy		Litchfield, Connecticut	Vermont	Lineman	Head
1930	William Mccarthy		Saginaw, Michigan	Michigan	—	Son
1940	William Mccarthy	15	St.-Louis-County, Missouri	Missouri	—	Son
1930	William Mccarthy		Middlesex, Massachusetts	Massachusetts	—	Son
1920	William Mccarthy		Norfolk, Massachusetts	Massachusetts	None	Son
1930	William H. Mccarthy		Bronx, New York	New York	—	Son
1900	William H. Mccarthy	12	Middlesex, Massachusetts	Massachusetts	At School	Son
1910	William L Mccarthy		Dauphin, Pennsylvania	Pennsylvania	Machine Hand	Son
1910	William Mccarthy		Kings, New York	New York	—	Son
1920	William Mccarthy		Will, Illinois	Illinois	—	Son
1910	William Mccarthy		Suffolk, Massachusetts	Massachusetts	None	Son
1930	William Mccarthy		Suffolk, Massachusetts	Massachusetts	None	Son
1920	William Mccarthy		Philadelphia, Pennsylvania	Pennsylvania	—	Son
1930	William Mccarthy		Lackawanna, Pennsylvania	Pennsylvania	—	Son
1910	William Mccarthy		New York, New York	Massachusetts	—	Son
1940	William Mccarthy	50	Norfolk-County, Massachusetts	Massachusetts	Crossing Man	Head
1930	William H. Jr. Mccarthy		Plymouth, Massachusetts	Massachusetts	Laborer	Son

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About William Mccarthy US Census Records & Model Tree

We've indexed 7402 free, proprietary US Census records for William Mccarthy 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 7402 US Census records for William Mccarthy, 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 Mccarthy'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 Mccarthy 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 Mccarthy 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 Mccarthy US Census Records

Anna Mccarthy Catherine Mccarthy Charles Mccarthy Daniel Mccarthy Edward Mccarthy Elizabeth Mccarthy Helen Mccarthy James Mccarthy John Mccarthy Joseph Mccarthy Margaret Mccarthy Mary Mccarthy Robert Mccarthy Thomas Mccarthy

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