How many William Harrington census records do you have?

We have 4401 US Census records for William Harrington, from 1900 to 1950, across 50 states, DC, and 1 territory.

What's in a William Harrington census record?

You'll see William'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 William 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 William Harrington census records free?

Yes. All William 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 William Harrington?

We have William Harrington 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 William 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 William 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.

William Harrington — US Census Records & Model Tree

We found 4401 free census records for William Harrington across 6 census years (1900–1950), in 50 states, DC, and 1 territory and 875 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

William Harrington Census Records by State & County

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Showing of 4401 records for William Harrington US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	William A Jr Harrington	29	Pottawatomie-County, Kansas	Kansas	Bookkeeper	Son
1930	William B. Harrington		Martin, North Carolina	North Carolina	Farm Laborer	Son
1930	William B. Harrington		Middlesex, New Jersey	New Jersey	—	Son
1940	William Harrington	21	Essex-County, Massachusetts	Massachusetts	Laborer	Son
1940	William Harrington	27	Middlesex-County, Massachusetts	Maine	Laborer	Son
1940	William Harrington	54	Lawrence-County, Mississippi	Mississippi	Farmer	Head
1940	William Harrington	62	Multnomah-County, Oregon	Minnesota	Millwright	Head
1920	William M. Harrington		Faulkner, Arkansas	Arkansas	—	Head
1910	William L Harrington		New Castle, Delaware	Maryland	Blacksmith	Head
1940	William Harrington	71	Genesee-County, Michigan	Michigan	—	Head
1940	William O. Harrington	11	Hickman-County, Tennessee	Tennessee	—	Son
1930	William G Jr Harrington		Montgomery, Kansas	Oklahoma	Pumper	Son
1940	William Ellis Harrington	48	Anson-County, North Carolina	North Carolina	Farmer	Head
1920	William L. Harrington		Jasper, Mississippi	Mississippi	Laborer	Son
1930	William L Harrington		Alexander, North Carolina	North Carolina	Teacher	Head
1930	William A Harrington		Alexander, North Carolina	North Carolina	Laborer	Son
1940	William J. Harrington	22	Suffolk-County, Massachusetts	Massachusetts	Carpenter'S Helper	Son
1940	William J. Harrington	19	Tippecanoe-County, Indiana	Indiana	Farming	Son
1930	William Harrington		Suffolk, Massachusetts	Massachusetts	—	Son
1910	William Harrington		Westmoreland, Pennsylvania	New York	Labor	Head
1940	William D. Harrington	17	Allegheny-County, Pennsylvania	Pennsylvania	—	Son
1940	William J. Harrington	50	Allegheny-County, Pennsylvania	Pennsylvania	Watchman	Head
1930	William Harrington		Brooke, West Virginia	Pennsylvania	Labour	Head
1940	William Harrington	17	Itasca-County, Minnesota	Minnesota	Clerical Work	Son
1940	William H Harrington	74	Pottawatomie-County, Kansas	Kansas	Proprietor	Head
1910	William A. Harrington		Sussex, Delaware	Delaware	Merchant	Head
1920	William J. Harrington		Suffolk, Massachusetts	Massachusetts	Chauf	Son
1940	William F. Harrington	21	Providence-County, Rhode Island	Rhode Island	Truck Driver	Son
1930	William Harrington		Kent, Michigan	Michigan	None	Son
1940	William J. Harrington	33	Norfolk-County, Massachusetts	Massachusetts	Clerk	Son

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About William Harrington US Census Records & Model Tree

We've indexed 4401 free, proprietary US Census records for William Harrington across 1900–1950, covering 50 states, DC, and 1 territory: Alabama, Alaska, American Samoa, 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 William 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 4401 US Census records for William Harrington, from 1900 to 1950, across 50 states, DC, and 1 territory.
: You'll see William'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 William 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 William 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 William Harrington 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.

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