How many William Underwood census records do you have?

We have 3481 US Census records for William Underwood, from 1900 to 1950, across 49 states and DC.

What's in a William Underwood 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 Underwood'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 Underwood census records free?

Yes. All William Underwood 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 Underwood?

We have William Underwood records from the 1900 through 1950 US Federal Census, across 49 states and DC. Use the year and state filters to narrow your results.

How do I find William Underwood 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 Underwood?

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 Underwood — US Census Records & Model Tree

We found 3481 free census records for William Underwood across 6 census years (1900–1950), in 49 states and DC and 1036 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

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Showing of 3481 records for William Underwood US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	William H. Underwood		Baltimore, Maryland	Maryland	Office-Clerk	Head
1920	William A Underwood		Colbert, Alabama	Alabama	Farmer	Head
1940	William Underwood	57	Multnomah-County, Oregon	Washington	Portable Engineer	Head
1930	William J Underwood		Randolph, North Carolina	North Carolina	Laborer	Head
1940	William Underwood	65	Middlesex-County, Massachusetts	Vermont	Laborer	Head
1920	William T Underwood		Bexar, Texas	Georgia	Salesman	Head
1940	William H. Underwood	60	Vermilion-County, Illinois	Illinois	Laborer	Head
1920	William H. Underwood		Floyd, Virginia	Virginia	Farmer	Head
1910	William P Underwood		Haywood, North Carolina	North Carolina	Farmer	Head
1920	William Underwood		Orleans, Louisiana	Louisiana	—	Son
1920	William Underwood		Colbert, Alabama	Alabama	—	Son
1910	William H Underwood		Camden, New Jersey	Pennsylvania	Restaurant	Head
1930	William Underwood		Franklin, New York	New York	—	Son
1920	William L. Underwood		Caswell, North Carolina	North Carolina	Farmer	Head
1940	William C. Underwood	12	Barbour-County, Alabama	Alabama	—	Son
1920	William J. Underwood		Caswell, North Carolina	North Carolina	Farm Laborer	Son
1930	William M Underwood		Walker, Georgia	Georgia	—	Son
1910	William A. Underwood		Sevier, Tennessee	Tennessee	Farmer	Head
1940	William Jr. Underwood	13	Saline-County, Missouri	Missouri	—	Son
1940	William L. Underwood	10	Monroe-County, Indiana	Indiana	—	Son
1910	William H. Underwood		Dade, Missouri	Missouri	Farmer	Head
1940	William Underwood	46	Douglas-County, Kansas	Kansas	Manager	Head
1940	William Jr. Underwood	23	Douglas-County, Kansas	Kansas	Agent	Son
1930	William J. Underwood		Camden, New Jersey	New Jersey	Caddy	Son
1910	William Underwood		Autauga, Alabama	Alabama	Farm Laborer	Son
1940	William J. Underwood	54	Cook-County, Illinois	Wisconsin	Dentist	Head
1940	William Underwood	16	Barren-County, Kentucky	Kentucky	Farmer Apprentice	Son
1940	William B. Underwood	40	Summit-County, Ohio	Alabama	Curing Belts	Head
1920	William Underwood		Carter, Kentucky	Kentucky	Farmer	Head
1930	William H. Underwood		Harris, Texas	Texas	None	Son

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About William Underwood US Census Records & Model Tree

We've indexed 3481 free, proprietary US Census records for William Underwood across 1900–1950, covering 49 states and DC: Alabama, 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 3481 US Census records for William Underwood, from 1900 to 1950, across 49 states and DC.
: 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 Underwood'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 Underwood 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 Underwood records from the 1900 through 1950 US Federal Census, across 49 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.