How many John Larsen census records do you have?

We have 3734 US Census records for John Larsen, from 1900 to 1950, across 50 states and DC.

What's in a John Larsen 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 Larsen'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 Larsen census records free?

Yes. All John Larsen 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 Larsen?

We have John Larsen 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 John Larsen 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 Larsen?

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 Larsen — US Census Records & Model Tree

We found 3734 free census records for John Larsen across 6 census years (1900–1950), in 50 states and DC and 693 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Larsen Census Records by State & County

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Showing of 3734 records for John Larsen US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	John Larsen		Essex, New Jersey	New Jersey	Draftsman	Son
1920	John Larsen		Sullivan, Indiana	Indiana	—	Son
1940	John Larsen	24	Pierce-County, Washington	Washington	Labor	Son
1940	John Larsen	23	Cook-County, Illinois	Illinois	Printer	Head
1900	John Larsen	38	St Louis, Minnesota	Norway	Farmer	Head
1940	John F. Larsen	42	Marquette-County, Michigan	Finland	Foreman	Head
1930	John F. Larsen		Audubon, Iowa	Iowa	Farmer	Head
1920	John Larsen		Shelby, Iowa	Norway	Farmer	Head
1910	John Larsen		Hennepin, Minnesota	Norway	Moulder	Head
1920	John Larsen		Alameda, California	Finland	Carpenter	Head
1930	John Larsen		Smith, Kansas	Kansas	Farmer	Head
1930	John Larsen		Grays Harbor, Washington	Washington	—	Son
1940	John C. Larsen	48	Roberts-County, South Dakota	Denmark	Farm Operator	Head
1940	John Larsen	17	Clay-County, Minnesota	Minnesota	—	Son
1940	John Albert Larsen	12	Ocean-County, New Jersey	New Jersey	—	Son
1930	John Larsen		Richmond, New York	New York	—	Son
1930	John S Larsen		Buffalo, Wisconsin	Wisconsin	Farm Laborer	Head
1930	John Larsen		Douglas, Nebraska	Nebraska	—	Son
1910	John Larsen		Ramsey, Minnesota	Norway	Groceries	Head
1910	John Larsen		New York, New York	New York	—	Son
1910	John Larsen		Orleans, Louisiana	Norway	Pilot	Head
1940	John P. Larsen	46	Marinette-County, Wisconsin	Denmark	Janitor	Head
1930	John Larsen		Richmond, New York	New York	Iron Worker	Son
1940	John Larsen	10	New-York-County, New York	New York	—	Son
1930	John H. Larsen		Salt Lake, Utah	Utah	Gravel Tester	Head
1930	John Larsen		Kings, New York	New York	—	Son
1930	John Larsen		Hennepin, Minnesota	Minnesota	Bookkeeper	Son
1930	John Larsen		Carlton, Minnesota	Iowa	None	Son
1940	John W. Larsen	14	Marquette-County, Michigan	Michigan	—	Son
1930	John C Larsen		Salt Lake, Utah	Utah	Printer	Son

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About John Larsen US Census Records & Model Tree

We've indexed 3734 free, proprietary US Census records for John Larsen 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 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 3734 US Census records for John Larsen, from 1900 to 1950, across 50 states and DC.
: 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 Larsen'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 Larsen 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 Larsen 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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