How many John Corcoran census records do you have?

We have 3252 US Census records for John Corcoran, from 1900 to 1950, across 48 states and DC.

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

Yes. All John Corcoran 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 Corcoran?

We have John Corcoran records from the 1900 through 1950 US Federal Census, across 48 states and DC. Use the year and state filters to narrow your results.

How do I find John Corcoran 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 Corcoran?

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 Corcoran — US Census Records & Model Tree

We found 3252 free census records for John Corcoran across 6 census years (1900–1950), in 48 states and DC and 412 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Corcoran Census Records by State & County

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Showing of 3252 records for John Corcoran US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	John F. Corcoran	24	Cook-County, Illinois	Illinois	Wholesale Salesman	Son
1920	John Corcoran		Kings, New York	Ireland	Laborer	Head
1940	John J. Corcoran	58	Cook-County, Illinois	Ireland	Police Officer	Head
1940	John J. Corcoran	46	Hudson-County, New Jersey	Ireland	Training Sgt.	Head
1940	John Corcoran	46	Queens-County, New York	Ireland	Construction Foreman	Head
1900	John Corcoran	55	Dutchess, New York	Ireland	Hat Manufacturer	Head
1920	John J. Corcoran		Santa Clara, California	Maine	Clerk	Head
1930	John Corcoran		Orleans, Louisiana	Louisiana	—	Son
1940	John Henry Corcoran	19	Yolo-County, California	California	—	Son
1910	John P. Corcoran		Allegheny, Pennsylvania	Pennsylvania	Helper	Son
1910	John B. Corcoran		Carver, Minnesota	Minnesota	Labour	Son
1940	John R Corcoran	11	Perkins-County, South Dakota	South Dakota	—	Son
1940	John Corcoran	36	Dane-County, Wisconsin	Wisconsin	Laborer	Head
1940	John Jr. Corcoran	10	Anne-Arundel-County, Maryland	Maryland	—	Son
1910	John Corcoran		Whitman, Washington	Washington	—	Son
1910	John Corcoran		Whatcom, Washington	Kansas	—	Son
1940	John Corcoran	14	Bronx-County, New York	New York	—	Son
1910	John Corcoran		Buchanan, Iowa	Iowa	Farmer	Head
1910	John Jr. Corcoran		Providence, Rhode Island	Rhode Island	Laborer	Son
1910	John Corcoran		Middlesex, Massachusetts	Massachusetts	None	Son
1940	John Corcoran	43	Suffolk-County, Massachusetts	Massachusetts	Teacher	Head
1940	John P Corcoran	44	Ross-County, Ohio	Ohio	Farmer	Head
1940	John Corcoran	13	Winona-County, Minnesota	Minnesota	—	Son
1920	John W. Corcoran		Kings, New York	Pennsylvania	Blacksmith	Head
1940	John Corcoran	37	Essex-County, New Jersey	New York	Truck Driver	Head
1940	John Corcoran	12	Bergen-County, New Jersey	New Jersey	—	Son
1940	John L Corcoran	17	Ross-County, Ohio	Ohio	—	Son
1940	John Jr. Corcoran	11	Suffolk-County, Massachusetts	Massachusetts	—	Son
1910	John P. Corcoran		New Haven, Connecticut	Ireland	Watchman	Head
1940	John Corcoran	12	New-York-County, New York	New York	—	Son

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About John Corcoran US Census Records & Model Tree

We've indexed 3252 free, proprietary US Census records for John Corcoran across 1900–1950, covering 48 states and DC: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, 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, 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 3252 US Census records for John Corcoran, from 1900 to 1950, across 48 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 Corcoran'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 Corcoran 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 Corcoran records from the 1900 through 1950 US Federal Census, across 48 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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