How many Mary Campbell census records do you have?

We have 30503 US Census records for Mary Campbell, from 1900 to 1950, across 50 states, DC, and 1 territory.

What's in a Mary Campbell census record?

You'll see Mary'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 Mary Campbell'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 Mary Campbell census records free?

Yes. All Mary Campbell 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 Mary Campbell?

We have Mary Campbell 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 Mary Campbell 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 Mary Campbell?

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.

Mary Campbell — US Census Records & Model Tree

We found 30503 free census records for Mary Campbell across 6 census years (1900–1950), in 50 states, DC, and 1 territory and 2400 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Campbell Census Records by State & County

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Showing of 30503 records for Mary Campbell US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	Mary Campbell		St Clair, Illinois	Kansas	Clerk	Daughter
1940	Mary E. Campbell	27	Jackson-County, Missouri	Missouri	Turn In Girl	Daughter
1930	Mary M. Campbell		Providence, Rhode Island	Rhode Island	—	Daughter
1940	Mary Campbell	56	Hamilton-County, Ohio	Scotland	Bookkeeper	Daughter
1930	Mary A Campbell		Providence, Rhode Island	Rhode Island	Bookkeeper	Daughter
1930	Mary A Campbell		Philadelphia, Pennsylvania	Ireland	Housework	Wife
1940	Mary Campbell	64	Eau-Claire-County, Wisconsin	Norway	—	Wife
1940	Mary S. Campbell	60	Fayette-County, West Virginia	West Virginia	—	Wife
1940	Mary Campbell	45	Bronx-County, New York	Ireland	—	Wife
1920	Mary Campbell		Allegheny, Pennsylvania	Scotland	—	Wife
1940	Mary Campbell	54	Van-Zandt-County, Texas	Texas	—	Wife
1940	Mary Campbell	41	Talladega-County, Alabama	Georgia	—	Head
1940	Mary Campbell	53	Cook-County, Illinois	Ireland	—	Wife
1930	Mary Campbell		Kings, New York	Ireland	—	Head
1940	Mary C. Campbell	68	King-County, Washington	Wisconsin	—	Wife
1940	Mary Campbell	57	Jackson-County, Missouri	Ireland	—	Wife
1930	Mary Campbell		Columbiana, Ohio	West Virginia	—	Wife
1920	Mary A. Campbell		Middlesex, Massachusetts	Ireland	—	Wife
1940	Mary E. Campbell	54	Lincoln-County, Nevada	Nevada	—	Head
1940	Mary Campbell	43	Yakima-County, Washington	Oregon	Bookkeeper	Wife
1940	Mary H. Campbell	74	Pocahontas-County, Iowa	Illinois	—	Wife
1940	Mary Campbell	52	Camden-County, New Jersey	New Jersey	—	Wife
1940	Mary Campbell	57	Canyon-County, Idaho	Idaho	—	Head
1940	Mary Campbell	69	Lane-County, Oregon	Missouri	—	Wife
1940	Mary Campbell	25	Alameda-County, California	Oregon	Clerk	Wife
1940	Mary J. Campbell	52	Cecil-County, Maryland	Maryland	Housekeeper	Wife
1940	Mary A. Campbell	76	Douglas-County, Oregon	Iowa	Homemaker	Head
1940	Mary Campbell	84	Clay-County, Illinois	Ohio	—	Head
1940	Mary M. Campbell	67	District-Of-Columbia-County, District of Columbia	Ireland	Housework	Head
1940	Mary Campbell	70	Westchester-County, New York	Scotland	—	Head

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About Mary Campbell US Census Records & Model Tree

We've indexed 30503 free, proprietary US Census records for Mary Campbell across 1900–1950, covering 50 states, DC, and 1 territory: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Guam, 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 Mary 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 30503 US Census records for Mary Campbell, from 1900 to 1950, across 50 states, DC, and 1 territory.
: You'll see Mary'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 Mary Campbell'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 Mary Campbell 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 Mary Campbell 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.

Other Campbell US Census Records

Albert Campbell Alice Campbell Anna Campbell Annie Campbell Arthur Campbell Bessie Campbell Catherine Campbell Charles Campbell Clara Campbell Clarence Campbell David Campbell Donald Campbell Dorothy Campbell Earl Campbell Edith Campbell Edna Campbell Edward Campbell Elizabeth Campbell Emma Campbell Ethel Campbell Florence Campbell Frank Campbell Fred Campbell George Campbell Grace Campbell Harry Campbell Helen Campbell Henry Campbell Ida Campbell James Campbell Jessie Campbell John Campbell Joseph Campbell Lula Campbell Margaret Campbell Martha Campbell Mildred Campbell Minnie Campbell Nellie Campbell Richard Campbell Robert Campbell Ruth Campbell Sarah Campbell Thomas Campbell Walter Campbell William Campbell Willie Campbell

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