How many William Gallagher census records do you have?

We have 6630 US Census records for William Gallagher, from 1900 to 1950, across 50 states and DC.

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

Yes. All William Gallagher 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 Gallagher?

We have William Gallagher 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 Gallagher 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 Gallagher?

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 Gallagher — US Census Records & Model Tree

We found 6630 free census records for William Gallagher across 6 census years (1900–1950), in 50 states and DC and 692 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

William Gallagher Census Records by State & County

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Showing of 6630 records for William Gallagher US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	William Gallagher	39	Norfolk-County, Massachusetts	Vermont	Teacher	Head
1930	William H. Jr. Gallagher		Middlesex, Massachusetts	Massachusetts	Paper Cutter	Son
1930	William A. Gallagher		Philadelphia, Pennsylvania	Pennsylvania	Printing	Son
1930	William Gallagher		Cuyahoga, Ohio	Ohio	—	Son
1940	William Gallagher	44	Deer-Lodge-County, Montana	Montana	Janitress	Head
1940	William Gallagher	27	Philadelphia-County, Pennsylvania	Pennsylvania	Bookkeeper	Son
1940	William Gallagher	27	Hudson-County, New Jersey	New Jersey	Carpenter	Head
1940	William L Gallagher	45	Dakota-County, Minnesota	South Dakota	Skilled Laborer	Head
1940	William Gallagher	35	Campbell-County, Kentucky	Kentucky	Janitor	Son
1920	William Gallagher		Rice, Minnesota	Iowa	Conductor	Son
1930	William Gallagher		Arapahoe, Colorado	Colorado	Meat Cutter	Son
1930	William Gallagher		Luzerne, Pennsylvania	Pennsylvania	Labor	Son
1930	William J. Jr. Gallagher		Norfolk, Massachusetts	Massachusetts	Chauffeur	Son
1930	William Gallagher		Westmoreland, Pennsylvania	Pennsylvania	Proprietor	Head
1940	William Gallagher	45	Los-Angeles-County, California	Oregon	Cement Finisher	Head
1900	William T Gallagher	67	Mercer, New Jersey	Pennsylvania	Carpenter	Head
1920	William H Gallagher		Middlesex, Massachusetts	Massachusetts	Accountant	Son
1940	William B. Gallagher	45	Divide-County, North Dakota	Wisconsin	Laborer	Head
1940	William Jr. Gallagher	12	Philadelphia-County, Pennsylvania	Pennsylvania	—	Son
1910	William Gallagher		Seward, Nebraska	Nebraska	—	Son
1940	William H., Jr. Gallagher	21	Essex-County, Massachusetts	Massachusetts	Truck Driver	Son
1920	William Gallagher		Burlington, New Jersey	New Jersey	Farmer	Son
1940	William Jr Gallagher	15	Essex-County, Massachusetts	Massachusetts	—	Son
1940	William Gallagher	14	Philadelphia-County, Pennsylvania	Pennsylvania	—	Son
1940	William Gallagher	41	Essex-County, Massachusetts	Massachusetts	Checker	Head
1920	William J. Gallagher		Suffolk, Massachusetts	Massachusetts	Fireman	Head
1920	William Gallagher		Kings, New York	New York	—	Son
1940	William Gallagher	40	Philadelphia-County, Pennsylvania	Scotland	Electric Operator	Head
1920	William Gallagher		Cambria, Pennsylvania	Pennsylvania	Machinist	Son
1920	William Gallagher		Cuyahoga, Ohio	Ohio	—	Son

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About William Gallagher US Census Records & Model Tree

We've indexed 6630 free, proprietary US Census records for William Gallagher 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 6630 US Census records for William Gallagher, 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 Gallagher'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 Gallagher 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 Gallagher 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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