How many William Frederick census records do you have?

We have 2802 US Census records for William Frederick, from 1900 to 1950, across 48 states, DC, and 1 territory.

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

Yes. All William Frederick 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 Frederick?

We have William Frederick records from the 1900 through 1950 US Federal Census, across 48 states, DC, and 1 territory. Use the year and state filters to narrow your results.

How do I find William Frederick 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 Frederick?

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 Frederick — US Census Records & Model Tree

We found 2802 free census records for William Frederick across 6 census years (1900–1950), in 48 states, DC, and 1 territory and 700 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 2802 records for William Frederick US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	William J. Frederick	33	Jefferson-County, Kentucky	Kentucky	Truck Driver	Head
1930	William H Frederick		Queens, New York	New York	—	Son
1940	William Frederick	47	Chester-County, South Carolina	South Carolina	Farmer	Head
1930	William G. Frederick		Allegheny, Pennsylvania	Pennsylvania	Electrician	Head
1930	William E. Frederick		Duplin, North Carolina	North Carolina	Laborer	Head
1910	William F Frederick		Greene, Indiana	Indiana	—	Son
1910	William Frederick		Luzerne, Pennsylvania	Pennsylvania	Boilermaker	Head
1930	William H. Frederick		Bucks, Pennsylvania	New Jersey	Brakeman	Head
1940	William Frederick	15	Columbiana-County, Ohio	Ohio	—	Son
1910	William J Frederick		Elkhart, Indiana	Indiana	Farmer	Head
1910	William Frederick		Sumter, Georgia	Georgia	Farmer	Head
1940	William Jr. Frederick	13	Middlesex-County, Massachusetts	Massachusetts	—	Son
1940	William G Frederick	44	Cristobal-County, None	St. Lucia	Seaman	Head
1940	William Frederick	40	Whitley-County, Kentucky	Kentucky	40	Head
1940	William Frederick	24	Allegheny-County, Pennsylvania	Pennsylvania	Mechanic Helper	Son
1940	William Jr Frederick	14	Clayton-County, Iowa	Iowa	—	Son
1930	William Frederick		Baltimore, Maryland	Maryland	Special	Head
1930	William Frederick		Pierce, Washington	Iowa	Shoe Repairer	Head
1920	William J Frederick		Indiana, Pennsylvania	Pennsylvania	Farmer	Head
1930	William G Frederick		Blair, Pennsylvania	Pennsylvania	Laborer	Son
1920	William Frederick		Chippewa, Wisconsin	Wisconsin	Farm Laborer	Son
1940	William Frederick	21	Carbon-County, Pennsylvania	Pennsylvania	New Worker	Son
1940	William Frederick	44	Clarion-County, Pennsylvania	Pennsylvania	Driller	Head
1930	William Frederick		Carroll, Maryland	Maryland	—	Son
1930	William Frederick		Morton, North Dakota	North Dakota	Farmer	Head
1910	William H. Frederick		Essex, New Jersey	New Jersey	Jeweler	Head
1940	William J. Frederick	15	Greene-County, Indiana	Indiana	—	Son
1930	William Frederick		Queens, New York	Germany	Manager	Head
1940	William A. Frederick	14	Union-County, Pennsylvania	Pennsylvania	—	Son
1930	William A. Jr. Frederick		Smith, Texas	Texas	—	Son

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About William Frederick US Census Records & Model Tree

We've indexed 2802 free, proprietary US Census records for William Frederick across 1900–1950, covering 48 states, DC, and 1 territory: 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 York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Puerto Rico, 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 2802 US Census records for William Frederick, from 1900 to 1950, across 48 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 Frederick'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 Frederick 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 Frederick records from the 1900 through 1950 US Federal Census, across 48 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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