How many Margaret Sullivan census records do you have?

We have 17867 US Census records for Margaret Sullivan, from 1900 to 1950, across 50 states, DC, and 1 territory.

What's in a Margaret Sullivan census record?

You'll see Margaret'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 Margaret 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 Margaret Sullivan census records free?

Yes. All Margaret 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 Margaret Sullivan?

We have Margaret Sullivan 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 Margaret 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 Margaret 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.

Margaret Sullivan — US Census Records & Model Tree

We found 17867 free census records for Margaret Sullivan across 6 census years (1900–1950), in 50 states, DC, and 1 territory and 1117 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Margaret Sullivan Census Records by State & County

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Showing of 17867 records for Margaret Sullivan US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Margaret Sullivan	32	Hudson-County, New Jersey	New Jersey	Teacher	Daughter
1940	Margaret Sullivan	22	San-Francisco-County, California	California	Secretary	Daughter
1940	Margaret Sullivan	28	Baltimore-City-County, Maryland	Maryland	Teacher (Sub)	Daughter
1940	Margaret Sullivan	28	Cuyahoga-County, Ohio	Ohio	Solicitor	Daughter
1940	Margaret Sullivan	31	Allegheny-County, Pennsylvania	Pennsylvania	—	Wife
1940	Margaret Sullivan	20	Androscoggin-County, Maine	Maine	Maid	Daughter
1940	Margaret M. Sullivan	41	Cuyahoga-County, Ohio	Ohio	Nurse	Daughter
1940	Margaret Sullivan	25	St.-Clair-County, Illinois	Illinois	Housework	Daughter
1940	Margaret Sullivan	23	Middlesex-County, New Jersey	New Jersey	Hand Work	Daughter
1930	Margaret Sullivan		Franklin, Ohio	Ohio	Manager	Daughter
1940	Margaret Sullivan	30	Cook-County, Illinois	Illinois	Waitress	Daughter
1940	Margaret M Sullivan	27	Ramsey-County, Minnesota	Minnesota	—	Wife
1940	Margaret K Sullivan	27	Silver-Bow-County, Montana	Montana	Stenographer	Daughter
1930	Margaret Sullivan		Philadelphia, Pennsylvania	Pennsylvania	Teacher	Daughter
1940	Margaret Sullivan	22	St.-Louis-City-County, Missouri	Missouri	Housekeeper	Wife
1930	Margaret A. Sullivan		Suffolk, Massachusetts	Canada English	Operator	Daughter
1920	Margaret Sullivan		Merrimack, New Hampshire	New Hampshire	Asst Matron	Daughter
1930	Margaret Sullivan		Cook, Illinois	Illinois	—	Daughter
1940	Margaret A. Sullivan	76	Morrison-County, Minnesota	Minnesota	—	Head
1940	Margaret Sullivan	63	Lancaster-County, Nebraska	Michigan	—	Wife
1940	Margaret Sullivan	44	Allegheny-County, Pennsylvania	Pennsylvania	—	Wife
1930	Margaret Sullivan		Cumberland, Maine	Maine	—	Wife
1940	Margaret Sullivan	85	Smith-County, Mississippi	Mississippi	—	Wife
1940	Margaret Sullivan	41	Marion-County, Indiana	Kentucky	—	Wife
1940	Margaret L. Sullivan	46	Wayne-County, Michigan	Michigan	—	Wife
1940	Margaret Sullivan	46	Hudson-County, New Jersey	New Jersey	—	Wife
1940	Margaret Sullivan	52	King-County, Washington	England	Manager	Wife
1940	Margaret Sullivan	61	Freeborn-County, Minnesota	Minnesota	—	Wife
1940	Margaret Sullivan	65	Plymouth-County, Massachusetts	Canada English	—	Wife
1940	Margaret Sullivan	64	Lancaster-County, Nebraska	Illinois	—	Wife

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About Margaret Sullivan US Census Records & Model Tree

We've indexed 17867 free, proprietary US Census records for Margaret Sullivan across 1900–1950, covering 50 states, DC, and 1 territory: 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, 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 Margaret 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 17867 US Census records for Margaret Sullivan, from 1900 to 1950, across 50 states, DC, and 1 territory.
: You'll see Margaret'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 Margaret 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 Margaret 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 Margaret Sullivan 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 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 Mary 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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