How many James Cassidy census records do you have?

We have 4271 US Census records for James Cassidy, from 1900 to 1950, across 49 states, DC, and 1 territory.

What's in a James Cassidy census record?

You'll see James'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 James Cassidy'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 James Cassidy census records free?

Yes. All James Cassidy 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 James Cassidy?

We have James Cassidy 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 James Cassidy 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 James Cassidy?

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.

James Cassidy — US Census Records & Model Tree

We found 4271 free census records for James Cassidy across 6 census years (1900–1950), in 49 states, DC, and 1 territory and 674 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

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Showing of 4271 records for James Cassidy US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	James Cassidy	29	Hudson-County, New Jersey	New Jersey	Clerk	Head
1940	James L. Cassidy	29	Fergus-County, Montana	Montana	Farmer	Son
1940	James Cassidy	27	Suffolk-County, Massachusetts	Massachusetts	Laborer	Head
1930	James Cassidy		Suffolk, Massachusetts	Massachusetts	Clerk	Son
1940	James Cassidy	21	Hamilton-County, Ohio	Ohio	Steward	Son
1930	James Cassidy		Union, New Jersey	Ireland	—	Head
1940	James Cassidy	49	Suffolk-County, Massachusetts	Massachusetts	Longshoreman	Head
1940	James Cassidy	39	Kings-County, New York	New York	Clerk	Head
1940	James D. Cassidy	50	Butler-County, Ohio	Kentucky	Engineer	Head
1940	James J Cassidy	77	Baltimore-City-County, Maryland	Maryland	—	Head
1930	James A Cassidy		Blair, Pennsylvania	Pennsylvania	Machinist	Head
1930	James Cassidy		Kings, New York	New York	Clerk	Son
1940	James Cassidy	24	Chesterfield-County, South Carolina	South Carolina	Laborer	Son
1930	James Cassidy		Perry, Indiana	Indiana	Farmer	Head
1920	James Cassidy		Olmsted, Minnesota	Minnesota	—	Son
1940	James Jr. Cassidy	13	Knox-County, Tennessee	Tennessee	—	Son
1920	James Cassidy		Middlesex, Massachusetts	Massachusetts	Painter	Son
1940	James Cassidy	59	Knox-County, Tennessee	Tennessee	Farmer	Head
1910	James Cassidy		Cook, Illinois	Ireland	—	Head
1920	James P Cassidy		Middlesex, Massachusetts	Massachusetts	None	Son
1940	James Cassidy	41	Lafayette-County, Wisconsin	Wisconsin	Farmer	Head
1910	James Cassidy		Berkshire, Massachusetts	New York	Carpenter	Head
1910	James L. Cassidy		Mobile, Alabama	Louisiana	Painter	Head
1940	James Cassidy	38	Montgomery-County, Pennsylvania	Irish Free State	Millwright	Head
1940	James Cassidy	20	Warren-County, New Jersey	New Jersey	Clerk	Son
1920	James Cassidy		Allegheny, Pennsylvania	Pennsylvania	Laborer	Son
1930	James Cassidy		New York, New York	New York	Clerk	Head
1940	James Cassidy	18	Montgomery-County, Pennsylvania	Massachusetts	Topper	Son
1940	James Jr. Cassidy	17	Hampden-County, Massachusetts	Massachusetts	None	Son
1920	James Cassidy		Baltimore, Maryland	Maryland	Clerk	Son

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About James Cassidy US Census Records & Model Tree

We've indexed 4271 free, proprietary US Census records for James Cassidy across 1900–1950, covering 49 states, DC, and 1 territory: Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Guam, 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 James 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 4271 US Census records for James Cassidy, from 1900 to 1950, across 49 states, DC, and 1 territory.
: You'll see James'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 James Cassidy'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 James Cassidy 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 James Cassidy 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.