How many William Dempsey census records do you have?

We have 2828 US Census records for William Dempsey, from 1900 to 1950, across 47 states, DC, and 1 territory.

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

Yes. All William Dempsey 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 Dempsey?

We have William Dempsey records from the 1900 through 1950 US Federal Census, across 47 states, DC, and 1 territory. Use the year and state filters to narrow your results.

How do I find William Dempsey 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 Dempsey?

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 Dempsey — US Census Records & Model Tree

We found 2828 free census records for William Dempsey across 6 census years (1900–1950), in 47 states, DC, and 1 territory and 587 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

William Dempsey Census Records by State & County

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Showing of 2828 records for William Dempsey US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	William Dempsey		Kings, New York	New York	Clerk	Head
1930	William Dempsey		None, None	West Virginia	—	Head
1920	William Dempsey		Passaic, New Jersey	New Jersey	None	Son
1920	William Dempsey		Kings, New York	New York	—	Head
1940	William B. Dempsey	60	Johnson-County, Texas	Alabama	Drill Pressman	Head
1930	William Jr Dempsey		Philadelphia, Pennsylvania	Pennsylvania	—	Son
1940	William Dempsey	15	Middlesex-County, Massachusetts	Massachusetts	—	Son
1940	William B. Dempsey	55	Houston-County, Alabama	South Carolina	Farm Labor	Head
1930	William Dempsey		Lackawanna, Pennsylvania	Pennsylvania	Laborer	Son
1940	William Dempsey	11	Wayne-County, Michigan	Michigan	—	Son
1930	William Dempsey		St Lawrence, New York	New York	None	Son
1940	William Dempsey	24	Rockdale-County, Georgia	Georgia	Farmer	Son
1910	William Dempsey		Queens, New York	Ireland	General Contractor	Head
1940	William Dempsey	12	Baltimore-City-County, Maryland	Maryland	—	Son
1940	William D. Dempsey	30	Suffolk-County, Massachusetts	Massachusetts	Counter Man	Son
1940	William H. Dempsey	23	Martin-County, North Carolina	North Carolina	Farming	Son
1940	William Dempsey	17	Essex-County, New Jersey	New Jersey	Paper Boy	Son
1930	William Dempsey		Saline, Illinois	Pennsylvania	Miner	Head
1920	William Dempsey		Ramsey, Minnesota	Minnesota	None	Son
1940	William Dempsey	15	Suffolk-County, Massachusetts	Massachusetts	—	Son
1940	William H Dempsey	16	Baltimore-County, Maryland	Maryland	—	Son
1940	William Dempsey	58	Union-County, Kentucky	Kentucky	Miner	Head
1940	William Dempsey	24	Queens-County, New York	New York	Steno	Son
1940	William Dempsey	27	Kings-County, New York	New York	Apprentice	Son
1930	William J. Dempsey		New Haven, Connecticut	Ireland	Laborer	Head
1940	William E Dempsey	21	Wayne-County, Michigan	MICHIGAN	Bookkeeper Tax Record	Son
1940	William E. Dempsey	12	District-Of-Columbia-County, District of Columbia	Virginia	—	Son
1920	William Dempsey		Kings, New York	New York	—	Head
1940	William J. Dempsey	47	Olmsted-County, Minnesota	Minnesota	Farmer	Head
1940	William L. Dempsey	17	Guilford-County, North Carolina	Pennsylvania	None	Son

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About William Dempsey US Census Records & Model Tree

We've indexed 2828 free, proprietary US Census records for William Dempsey across 1900–1950, covering 47 states, DC, and 1 territory: Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Guam, Hawaii, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, 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 2828 US Census records for William Dempsey, from 1900 to 1950, across 47 states, DC, and 1 territory.
: 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 Dempsey'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 Dempsey 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 Dempsey records from the 1900 through 1950 US Federal Census, across 47 states, DC, and 1 territory. 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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