How many Mary Sullivan census records do you have?

We have 45863 US Census records for Mary Sullivan, from 1900 to 1950, across 50 states and DC.

What's in a Mary Sullivan 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 Sullivan'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 Sullivan census records free?

Yes. All Mary Sullivan 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 Sullivan?

We have Mary Sullivan 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 Mary Sullivan 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 Sullivan?

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 Sullivan — US Census Records & Model Tree

We found 45863 free census records for Mary Sullivan across 6 census years (1900–1950), in 50 states and DC and 1919 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 45863 records for Mary Sullivan US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	Mary E Sullivan		Newport, Rhode Island	Rhode Island	None	Daughter
1930	Mary Sullivan		Wayne, Michigan	Michigan	Stenographer	Daughter
1920	Mary Sullivan		Anderson, South Carolina	South Carolina	—	Daughter
1920	Mary Sullivan		Hillsborough, New Hampshire	New Hampshire	Dresser	Daughter
1940	Mary Jane Sullivan	21	Montgomery-County, Ohio	Ohio	Seamstress	Daughter
1940	Mary Sullivan	40	Cumberland-County, Maine	Maine	Teacher	Daughter
1920	Mary Sullivan		Providence, Rhode Island	Rhode Island	Bookkeeper	Daughter
1930	Mary Sullivan		Greenville, South Carolina	South Carolina	—	Daughter
1940	Mary S. Sullivan	24	Jefferson-County, Kentucky	Kentucky	Steno.	Daughter
1940	Mary Sullivan	22	Baltimore-City-County, Maryland	Maryland	Box Maker	Daughter
1930	Mary Sullivan		Warren, New Jersey	New Jersey	Weaver	Daughter
1940	Mary Sullivan	42	Silver-Bow-County, Montana	Utah	—	Daughter
1910	Mary J Sullivan		San Francisco, California	California	None	Daughter
1920	Mary R. Sullivan		Middlesex, Massachusetts	New Hampshire	—	Son
1920	Mary Sullivan		Providence, Rhode Island	Rhode Island	Stock Clerk	Daughter
1940	Mary Sullivan	32	Union-County, New Jersey	New Jersey	—	Daughter
1940	Mary E. Sullivan	64	Bristol-County, Massachusetts	England	—	Wife
1920	Mary Sullivan		Essex, Massachusetts	England	None	Wife
1920	Mary E. Sullivan		Merrimack, New Hampshire	Maine	—	Wife
1920	Mary Sullivan		Richmond, Georgia	Georgia	Cook	Wife
1920	Mary Sullivan		Providence, Rhode Island	Rhode Island	—	Wife
1930	Mary Sullivan		Baltimore, Maryland	Maryland	None	Wife
1940	Mary T. Sullivan	43	Essex-County, Massachusetts	New Hampshire	—	Wife
1920	Mary A Sullivan		Norfolk, Massachusetts	Rhode Island	—	Wife
1930	Mary G. Sullivan		Suffolk, Massachusetts	England	—	Wife
1940	Mary A. Sullivan	59	Le-Sueur-County, Minnesota	Minnesota	—	Wife
1930	Mary Sullivan		Philadelphia, Pennsylvania	Penna.	Homemaker	Head
1940	Mary C Sullivan	58	Cumberland-County, Maine	Maine	No	Head
1940	Mary Sullivan	56	Houghton-County, Michigan	Michigan	—	Head
1920	Mary J Sullivan		Providence, Rhode Island	Rhode Island	None	Wife

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About Mary Sullivan US Census Records & Model Tree

We've indexed 45863 free, proprietary US Census records for Mary Sullivan 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 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 45863 US Census records for Mary Sullivan, from 1900 to 1950, across 50 states and DC.
: 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 Sullivan'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 Sullivan 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 Sullivan 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.

Other Sullivan US Census Records

Agnes Sullivan Alice Sullivan Anna Sullivan Annie Sullivan Arthur Sullivan Catherine Sullivan Charles Sullivan Cornelius Sullivan Daniel Sullivan Dennis Sullivan Dorothy Sullivan Edward Sullivan Elizabeth Sullivan Ellen Sullivan Eugene Sullivan Florence Sullivan Francis Sullivan Frank Sullivan George Sullivan Helen Sullivan James Sullivan Jeremiah Sullivan John Sullivan Joseph Sullivan Julia Sullivan Katherine Sullivan Margaret Sullivan Michael Sullivan Nellie Sullivan Patrick Sullivan Richard Sullivan Robert Sullivan Ruth Sullivan Sarah Sullivan Thomas Sullivan Timothy Sullivan William Sullivan

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