How many John Harrington census records do you have?

We have 7691 US Census records for John Harrington, from 1900 to 1950, across 50 states and DC.

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

Yes. All John Harrington 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 Harrington?

We have John Harrington 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 Harrington 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 Harrington?

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 Harrington — US Census Records & Model Tree

We found 7691 free census records for John Harrington across 6 census years (1900–1950), in 50 states and DC and 1105 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Harrington Census Records by State & County

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Showing of 7691 records for John Harrington US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	John Harrington		Middlesex, Massachusetts	Massachusetts	Clerk	Son
1930	John E Harrington		Merrimack, New Hampshire	New Hampshire	Supervisor	Son
1940	John Harrington	25	Norfolk-County, Massachusetts	Massachusetts	Electrician Helper	Son
1940	John Harrington	30	Letcher-County, Kentucky	Kentucky	Motor Man	Head
1930	John Harrington		Middlesex, Massachusetts	Massachusetts	Machinist	Head
1930	John Harrington		Albany, New York	New York	Chauffeur	Son
1940	John Harrington	37	Queens-County, New York	New York	Salesman	Head
1930	John L Harrington		Kent, Delaware	Delaware	Carpenter	Head
1940	John Harrington	48	New-York-County, New York	Ireland	Porter	Head
1940	John Harrington	46	Genesee-County, Michigan	New York	Assembly	Head
1920	John Harrington		Ramsey, Minnesota	Ireland	Bricklayer	Head
1930	John Harrington		Essex, New Jersey	Ireland	Gardener	Head
1920	John Harrington		Silver Bow, Montana	Ireland	Manager	Head
1940	John F Harrington	52	Newport-County, Rhode Island	Rhode Island	Guard	Head
1940	John T. Harrington	44	Essex-County, New Jersey	New Jersey	Plumber	Head
1940	John J Harrington	66	New-York-County, New York	Ireland	Wine Merchant	Head
1930	John J Harrington		King, Washington	Montana	Police Officer	Head
1940	John Harrington	23	Suffolk-County, Massachusetts	Montana	Chauffeur	Son
1940	John L. Harrington	51	Los-Angeles-County, California	West Virginia	Caretaker	Head
1940	John Jr. Harrington	14	Los-Angeles-County, California	California	—	Son
1920	John J Harrington		Middlesex, Massachusetts	Massachusetts	Bricklayer	Son
1920	John Harrington		Woods, Oklahoma	Oklahoma	None	Son
1940	John C Harrington	48	Choctaw-County, Oklahoma	Arkansas	Farmer	Head
1930	John H Harrington		Tippah, Mississippi	Mississippi	—	Son
1940	John Harrington	11	Rensselaer-County, New York	New York	—	Son
1940	John A Harrington	19	Redwood-County, Minnesota	Minnesota	Electrician	Son
1940	John Harrington	21	Cuyahoga-County, Ohio	Ohio	Machine Operator	Son
1910	John Harrington		Coles, Illinois	Illinois	—	Son
1940	John Harrington	31	Silver-Bow-County, Montana	Montana	—	Son
1920	John Harrington		Jackson, Georgia	Georgia	Farm Laborer	Son

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About John Harrington US Census Records & Model Tree

We've indexed 7691 free, proprietary US Census records for John Harrington 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 7691 US Census records for John Harrington, 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 Harrington'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 Harrington 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 Harrington 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.