How many John Dempsey census records do you have?

We have 4623 US Census records for John Dempsey, from 1900 to 1950, across 49 states, DC, and 1 territory.

What's in a John Dempsey census record?

You'll see John'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 John 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 John Dempsey census records free?

Yes. All John 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 John Dempsey?

We have John Dempsey records from the 1900 through 1950 US Federal Census, across 49 states, DC, and 1 territory. Use the year and state filters to narrow your results.

How do I find John 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 John 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.

John Dempsey — US Census Records & Model Tree

We found 4623 free census records for John Dempsey across 6 census years (1900–1950), in 49 states, DC, and 1 territory and 721 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Dempsey Census Records by State & County

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Showing of 4623 records for John Dempsey US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	John Dempsey	28	Mahoning-County, Ohio	Ohio	Salesman	Son
1940	John Dempsey	44	Hamilton-County, Ohio	Ohio	Lawyer	Son
1940	John R. Dempsey	30	Erie-County, New York	New York	Insurance Agt	Head
1940	John (X) Dempsey	28	Hudson-County, New Jersey	New Jersey	Laborer	Head
1940	John Dempsey	42	Jo-Daviess-County, Illinois	Illinois	Bridge Carpenter	Son
1940	John P. Dempsey	74	Gallatin-County, Illinois	Kentucky	Farmer	Head
1920	John T Dempsey		Bertie, North Carolina	North Carolina	Blacksmith	Head
1940	John Dempsey	19	Baltimore-City-County, Maryland	Maryland	New Worker	Son
1940	John Dempsey	10	Hampden-County, Massachusetts	Massachusetts	—	Son
1930	John H. Dempsey		Monmouth, New Jersey	New Jersey	Mason	Head
1940	John Dempsey	19	Monroe-County, New York	New York	Laborer	Son
1910	John Dempsey		Kings, New York	England	Driver	Head
1940	John B. Dempsey	63	Mingo-County, West Virginia	West Virginia	Miner	Head
1910	John Dempsey		Pottawatomie, Kansas	Kansas	Stockman	Head
1910	John Dempsey		New York, New York	New York	Steamfitter	Head
1900	John T. Dempsey	46	Culpeper, Virginia	Virginia	Carpenter	Head
1940	John D. Dempsey	46	Camp-County, Texas	Alabama	Farmer	Head
1940	John T. Dempsey	11	Lucas-County, Ohio	Ohio	—	Son
1940	John Dempsey	22	Kings-County, New York	New York	Clerk	Son
1920	John Dempsey		Kings, New York	New Jersey	Laborer	Head
1940	John E Dempsey	20	Bexar-County, Texas	Texas	Elevator Boy	Son
1930	John Dempsey		Essex, New Jersey	New Jersey	None	Son
1920	John J. Dempsey		Erie, Pennsylvania	Pennsylvania	Laborer	Son
1940	John Dempsey	55	Lee-County, Illinois	Illinois	Laborer	Head
1940	John Dempsey	20	St.-Louis-City-County, Missouri	Missouri	Salesman	Son
1920	John Dempsey		Northampton, Pennsylvania	Pennsylvania	—	Son
1940	John Dempsey	10	Hudson-County, New Jersey	New Jersey	—	Son
1920	John Dempsey		Lewis, West Virginia	West Virginia	Operator	Head
1920	John Dempsey		Philadelphia, Pennsylvania	Pennsylvania	Clerk	Son
1910	John Dempsey		Kings, New York	New York	—	Head

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About John Dempsey US Census Records & Model Tree

We've indexed 4623 free, proprietary US Census records for John Dempsey across 1900–1950, covering 49 states, DC, and 1 territory: Alabama, 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, 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 John 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 4623 US Census records for John Dempsey, from 1900 to 1950, across 49 states, DC, and 1 territory.
: You'll see John'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 John 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 John 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 John Dempsey records from the 1900 through 1950 US Federal Census, across 49 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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