How many William Sweeney census records do you have?

We have 5694 US Census records for William Sweeney, from 1900 to 1950, across 50 states, DC, and 2 territories.

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

Yes. All William Sweeney 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 Sweeney?

We have William Sweeney records from the 1900 through 1950 US Federal Census, across 50 states, DC, and 2 territories. Use the year and state filters to narrow your results.

How do I find William Sweeney 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 Sweeney?

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 Sweeney — US Census Records & Model Tree

We found 5694 free census records for William Sweeney across 6 census years (1900–1950), in 50 states, DC, and 2 territories and 840 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

William Sweeney Census Records by State & County

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Showing of 5694 records for William Sweeney US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	William Sweeney	41	Kings-County, New York	New York	Clerk	Head
1940	William Sweeney	24	Monroe-County, New York	New York	Office Work	Son
1940	William Sweeney	24	Lackawanna-County, Pennsylvania	Pennsylvania	Truck Driver	Son
1930	William Sweeney		Luzerne, Pennsylvania	Pennsylvania	Weaver	Son
1920	William H. F. Sweeney		Providence, Rhode Island	Rhode Island	Hardware	Son
1940	William J. Sweeney	48	Middlesex-County, Massachusetts	Massachusetts	Salesman	Head
1940	William Sweeney	40	Hudson-County, New Jersey	New York	Fireman	Head
1940	William Sweeney	54	Mclean-County, Illinois	Illinois	Farmer	Head
1930	William Sweeney		Jefferson, Ohio	Pennsylvania	Yard Master	Head
1930	William Sweeney		Sullivan, Indiana	Indiana	Miner	Head
1920	William Sweeney		Kings, New York	Ireland	Laborer	Head
1930	William J. Sweeney		Essex, New Jersey	Ohio	Salesman	Head
1920	William Sweeney		Warren, Pennsylvania	Ireland	Carpenter	Head
1940	William P. Sweeney	57	Monterey-County, California	Michigan	Contractor	Head
1930	William G. Sweeney		Mercer, West Virginia	West Virginia	Farmer	Head
1930	William H. Sweeney		Suffolk, Massachusetts	Massachusetts	Journalist	Head
1930	William Sweeney		Bronx, New York	New York	—	Head
1930	William Sweeney		Wayne, Michigan	Michigan	—	Son
1930	William R. Sweeney		Suffolk, Massachusetts	Massachusetts	Chauffeur	Head
1940	William Sweeney	35	Philadelphia-County, Pennsylvania	Pennsylvania	Knitter	Son
1940	William Sweeney	42	Pottawattamie-County, Iowa	Iowa	Car Inspector	Head
1930	William Sweeney		Erie, New York	New York	—	Son
1930	William S. Sweeney		Allegheny, Pennsylvania	Pennsylvania	Laborer	Head
1940	William Sweeney	13	Taylor-County, Iowa	Iowa	—	Son
1940	William Sweeney	23	Queens-County, New York	New York	—	Son
1910	William Sweeney		New Castle, Delaware	Delaware	Clerk	Son
1940	William Sweeney	13	New-York-County, New York	New York	—	Son
1900	William Sweeney	15	Kings, New York	New York	At School	Son
1940	William J. Sweeney	47	Kent-County, Rhode Island	Massachusetts	Bus Operator	Head
1910	William Sweeney		Middlesex, Massachusetts	Ireland	Laborer	Head

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About William Sweeney US Census Records & Model Tree

We've indexed 5694 free, proprietary US Census records for William Sweeney across 1900–1950, covering 50 states, DC, and 2 territories: 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, Puerto Rico, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, U.S. Virgin Islands, 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 5694 US Census records for William Sweeney, from 1900 to 1950, across 50 states, DC, and 2 territories.
: 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 Sweeney'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 Sweeney 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 Sweeney records from the 1900 through 1950 US Federal Census, across 50 states, DC, and 2 territories. 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 Sweeney US Census Records

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