How many Mary Mcelroy census records do you have?

We have 2949 US Census records for Mary Mcelroy, from 1900 to 1950, across 49 states and DC.

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

Yes. All Mary Mcelroy 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 Mcelroy?

We have Mary Mcelroy 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 Mary Mcelroy 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 Mcelroy?

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 Mcelroy — US Census Records & Model Tree

We found 2949 free census records for Mary Mcelroy across 6 census years (1900–1950), in 49 states and DC and 697 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Mcelroy Census Records by State & County

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Showing of 2949 records for Mary Mcelroy US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	Mary E. Mcelroy		Providence, Rhode Island	Rhode Island	—	Wife
1920	Mary S. Mcelroy		Union, Iowa	Missouri	Farmer	Head
1940	Mary L. Mcelroy	47	Sumter-County, Alabama	Alabama	Adult Teacher	Wife
1940	Mary L. Mcelroy	62	Sumter-County, Alabama	Alabama	—	Wife
1940	Mary A. Mcelroy	68	Sumter-County, Alabama	Alabama	—	Wife
1920	Mary E. Mcelroy		Labette, Kansas	Kentucky	—	Head
1930	Mary Mcelroy		Wapello, Iowa	Iowa	—	Daughter
1910	Mary Mcelroy		Faulkner, Arkansas	Mississippi	—	Wife
1930	Mary Ell Mcelroy		Lincoln, Tennessee	Tennessee	—	Daughter
1910	Mary Mcelroy		Kings, New York	Ireland	—	Wife
1940	Mary A Mcelroy	21	Fremont-County, Iowa	Iowa	House Keeper	Daughter
1940	Mary B. Mcelroy	20	Marion-County, Kentucky	Kentucky	—	Daughter
1940	Mary Mcelroy	14	Wayne-County, Michigan	Michigan	—	Daughter
1930	Mary A. Mcelroy		Sumter, Alabama	Alabama	—	Daughter
1940	Mary C Mcelroy	14	Floyd-County, Iowa	Iowa	—	Daughter
1940	Mary Mcelroy	44	Washington-County, Pennsylvania	West Virginia	—	Wife
1930	Mary Mcelroy		New York, New York	New York	—	Wife
1940	Mary R Mcelroy	22	Providence-County, Rhode Island	Rhode Island	Price Clerk	Daughter
1920	Mary H Mcelroy		Providence, Rhode Island	Rhode Island	—	Daughter
1940	Mary Mcelroy	17	New-York-County, New York	New York	—	Daughter
1920	Mary Mcelroy		Providence, Rhode Island	Rhode Island	None	Daughter
1930	Mary S Mcelroy		Haralson, Georgia	Alabama	—	Wife
1910	Mary Mcelroy		New York, New York	Ireland	None	Head
1940	Mary J. Mcelroy	39	Wayne-County, Michigan	Vermont	—	Wife
1940	Mary Jane Mcelroy	15	Essex-County, New Jersey	New Jersey	—	Daughter
1940	Mary E. Mcelroy	15	Fulton-County, Georgia	Georgia	—	Daughter
1940	Mary Mcelroy	46	Atlantic-County, New Jersey	New Jersey	—	Wife
1940	Mary H. Mcelroy	37	Providence-County, Rhode Island	Rhode Island	—	Daughter
1920	Mary E. Mcelroy		Hudson, New Jersey	New York	—	Daughter
1910	Mary Mcelroy		Philadelphia, Pennsylvania	England	—	Wife

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About Mary Mcelroy US Census Records & Model Tree

We've indexed 2949 free, proprietary US Census records for Mary Mcelroy 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 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 2949 US Census records for Mary Mcelroy, from 1900 to 1950, across 49 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 Mcelroy'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 Mcelroy 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 Mcelroy 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.

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