How many Mary Horn census records do you have?

We have 4281 US Census records for Mary Horn, from 1900 to 1950, across 48 states and DC.

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

Yes. All Mary Horn 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 Horn?

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

How do I find Mary Horn 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 Horn?

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 Horn — US Census Records & Model Tree

We found 4281 free census records for Mary Horn across 6 census years (1900–1950), in 48 states and DC and 1114 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Horn Census Records by State & County

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Showing of 4281 records for Mary Horn US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1930	Mary Horn		Sumter, Alabama	Alabama	Laborer	Daughter
1940	Mary Horn	24	Jefferson-County, Kentucky	Kentucky	—	Daughter
1920	Mary M Horn		Choctaw, Alabama	Alabama	—	Daughter
1930	Mary L Horn		Whitman, Washington	Colorado	—	Head
1940	Mary Ann Horn	45	Big-Horn-County, Montana	Montana	—	Wife
1940	Mary Horn	65	Shawnee-County, Kansas	Kansas	—	Wife
1940	Mary E. Horn	61	Grayson-County, Kentucky	Kentucky	—	Wife
1940	Mary A. Horn	55	Sandusky-County, Ohio	Ohio	Proprietor	Wife
1920	Mary Horn		St Louis, Missouri	Ireland	—	Head
1930	Mary Horn		Stark, Ohio	Germany	—	Wife
1940	Mary Horn	56	Estill-County, Kentucky	Kentucky	Housekeeper	Wife
1940	Mary Horn	67	Mcdowell-County, West Virginia	Virginia	—	Wife
1940	Mary E. Horn	63	Webster-County, Missouri	Illinois	—	Wife
1930	Mary Horn		Effingham, Illinois	Illinois	None	Head
1930	Mary E. Horn		Baltimore, Maryland	Maryland	None	Wife
1920	Mary Jane Horn		Talladega, Alabama	Alabama	—	Daughter
1930	Mary Horn		Hawkins, Tennessee	Tennessee	—	Daughter
1940	Mary E Horn	23	Sandusky-County, Ohio	Ohio	Bookkeeper	Daughter
1910	Mary Horn		Holmes, Florida	Florida	None	Daughter
1930	Mary Horn		Hamilton, Tennessee	Tennessee	—	Daughter
1940	Mary Horn	11	New-Madrid-County, Missouri	Missouri	—	Daughter
1940	Mary Horn	16	Camden-County, New Jersey	New Jersey	—	Daughter
1910	Mary J. Horn		Buchanan, Virginia	Virginia	—	Daughter
1910	Mary Horn		Clarke, Mississippi	Mississippi	Farmer	Wife
1940	Mary Horn	34	Cambria-County, Pennsylvania	Pennsylvania	—	Wife
1930	Mary Horn		Leon, Texas	Texas	—	Daughter
1940	Mary Horn	17	Macomb-County, Michigan	Michigan	—	Daughter
1920	Mary Horn		Johnson, Missouri	Missouri	—	Daughter
1930	Mary E Horn		Greenup, Kentucky	Kentucky	—	Wife
1940	Mary A. Horn	52	Bucks-County, Pennsylvania	Pennsylvania	—	Wife

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About Mary Horn US Census Records & Model Tree

We've indexed 4281 free, proprietary US Census records for Mary Horn across 1900–1950, covering 48 states and DC: 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 Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, 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 4281 US Census records for Mary Horn, from 1900 to 1950, across 48 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 Horn'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 Horn 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 Horn records from the 1900 through 1950 US Federal Census, across 48 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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