How many James Duncan census records do you have?

We have 7992 US Census records for James Duncan, from 1900 to 1950, across 50 states, DC, and 1 territory.

What's in a James Duncan 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 Duncan'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 Duncan census records free?

Yes. All James Duncan 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 Duncan?

We have James Duncan records from the 1900 through 1950 US Federal Census, across 50 states, DC, and 1 territory. Use the year and state filters to narrow your results.

How do I find James Duncan 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 Duncan?

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 Duncan — US Census Records & Model Tree

We found 7992 free census records for James Duncan across 6 census years (1900–1950), in 50 states, DC, and 1 territory and 1598 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

James Duncan Census Records by State & County

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Showing of 7992 records for James Duncan US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1910	James B. Duncan		Stewart, Tennessee	Tennessee	Farm Laborer	Son
1940	James N. Duncan	39	Armstrong-County, Pennsylvania	Pennsylvania	Miner	Head
1940	James A. Duncan	26	Buncombe-County, North Carolina	North Carolina	Mail Clerk	Son
1930	James B W Duncan		King, Washington	Nebraska	Traffic Manager	Head
1940	James Duncan	53	Monroe-County, New York	Scotland	Farmer	Head
1940	James T Duncan	63	Allegheny-County, Pennsylvania	Scotland	Plumber	Head
1930	James C Duncan		Shasta, California	Illinois	Retired	Head
1920	James Duncan		Coles, Illinois	Illinois	Farmer	Head
1940	James H. Duncan	50	Orleans-County, Louisiana	Louisiana	—	Head
1940	James H. Duncan	56	Hudson-County, New Jersey	Scotland	Office Manager	Head
1930	James H. Duncan		Spartanburg, South Carolina	South Carolina	Farmer	Head
1910	James H Duncan		San Francisco, California	Scotland	Engraver	Head
1940	James Duncan	54	Dekalb-County, Georgia	Scotland	Power Company	Head
1940	James H. Duncan	43	Wayne-County, Michigan	Tennessee	Truck Driver	Head
1940	James N. Duncan	72	Monroe-County, Mississippi	Mississippi	—	Head
1930	James M Duncan		Washington, Pennsylvania	Pennsylvania	Manufacturer	Head
1940	James Duncan	81	Rock-Island-County, Illinois	Illinois	—	Head
1940	James Duncan	76	Montgomery-County, Illinois	Illinois	—	Head
1930	James Duncan		None, None	Kentucky	Laborer	Son
1940	James Duncan	59	Westchester-County, New York	Scotland	Painter	Head
1910	James Duncan		Laurens, South Carolina	South Carolina	—	Son
1920	James H. Duncan		None, None	Alabama	None	Son
1940	James Duncan	15	Clinton-County, Illinois	Illinois	Clerical Work	Son
1940	James Duncan	19	Marion-County, Indiana	Kentucky	—	Son
1920	James C. Duncan		Franklin, Georgia	Georgia	Laborer	Son
1900	James Duncan	47	Passaic, New Jersey	Scotland	Silk Warper	Head
1940	James O. Duncan	48	Benton-County, Arkansas	Arkansas	Farming	Head
1930	James Duncan		Lancaster, South Carolina	South Carolina	—	Son
1940	James Duncan	13	Catawba-County, North Carolina	North Carolina	—	Son
1930	James F Duncan		Prentiss, Mississippi	Mississippi	—	Son

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About James Duncan US Census Records & Model Tree

We've indexed 7992 free, proprietary US Census records for James Duncan across 1900–1950, covering 50 states, DC, and 1 territory: 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, 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 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 7992 US Census records for James Duncan, from 1900 to 1950, across 50 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 Duncan'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 Duncan 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 Duncan records from the 1900 through 1950 US Federal Census, across 50 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.