How many Mary Welch census records do you have?

We have 10968 US Census records for Mary Welch, from 1900 to 1950, across 50 states and DC.

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

Yes. All Mary Welch 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 Welch?

We have Mary Welch 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 Welch 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 Welch?

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 Welch — US Census Records & Model Tree

We found 10968 free census records for Mary Welch across 6 census years (1900–1950), in 50 states and DC and 1670 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Mary Welch Census Records by State & County

Records per state:

Census Record Search

First Name

Middle Name

Last Name (Required)

Census Year

State

Birth Year

Year Range

Birthplace

Age From

Age To

Exact match: Name Location Year

Alternate First Names (comma-separated)

Alternate Last Names (comma-separated)

County

Sex

Marital Status

Race

Relationship to Head

Occupation

Census Page ID

Family Members (in same household)

Search Records

Showing of 10968 records for Mary Welch US Census, ranked by Model Tree richness

No records match your filters.

Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	Mary A. Welch		Essex, Massachusetts	Massachusetts	—	Daughter
1940	Mary Welch	21	Suffolk-County, Massachusetts	Massachusetts	Clerk	Daughter
1940	Mary Welch	21	Crawford-County, Kansas	Kansas	Domestic	Daughter
1920	Mary Welch		Dutchess, New York	New York	Laundress	Daughter
1930	Mary J Welch		Winnebago, Wisconsin	Wisconsin	—	Daughter
1940	Mary E. Welch	26	Charles-County, Maryland	Maryland	—	Wife
1940	Mary Welch	28	Lewis-County, Kentucky	Kentucky	—	Wife
1920	Mary Welch		Middlesex, Massachusetts	Massachusetts	—	Daughter
1930	Mary Welch		Tallapoosa, Alabama	Alabama	—	Daughter
1920	Mary Welch		Denver, Colorado	Colorado	Stenographer	Daughter
1920	Mary D. Welch		Marion, Indiana	Indiana	Stenographer	Daughter
1920	Mary V Welch		Marion, Indiana	Indiana	—	Head
1930	Mary G Welch		Mercer, New Jersey	New Jersey	—	Wife
1920	Mary Welch		Middlesex, Massachusetts	Ireland	—	Wife
1920	Mary E Welch		Chowan, North Carolina	North Carolina	—	Wife
1920	Mary Welch		Worcester, Massachusetts	Ireland	—	Wife
1930	Mary F Welch		Multnomah, Oregon	Nebraska	Housework	Head
1920	Mary Welch		Sequatchie, Tennessee	Tennessee	None	Wife
1930	Mary E. Welch		Denver, Colorado	Illinois	—	Wife
1920	Mary Welch		Sarpy, Nebraska	Pennsylvania	None	Wife
1940	Mary Welch	58	New-York-County, New York	SCOTLAND	—	Head
1920	Mary Welch		Suffolk, Massachusetts	Ireland	—	Head
1930	Mary L. Welch		Fayette, Kentucky	Kentucky	None	Daughter
1940	Mary L. Welch	13	Elk-County, Kansas	Kansas	—	Daughter
1920	Mary Welch		Marlboro, South Carolina	South Carolina	—	Daughter
1940	Mary Welch	39	Philadelphia-County, Pennsylvania	Germany	—	Wife
1930	Mary M Welch		Suffolk, Massachusetts	Canada-English	—	Wife
1940	Mary V Welch	15	Multnomah-County, Oregon	Oregon	—	Daughter
1930	Mary Welch		Mineral, West Virginia	West Virginia	—	Wife
1930	Mary L. Welch		Limestone, Texas	Texas	—	Daughter

Load More Mary Welch Census Records

About Mary Welch US Census Records & Model Tree

We've indexed 10968 free, proprietary US Census records for Mary Welch 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 10968 US Census records for Mary Welch, 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 Welch'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 Welch 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 Welch 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 Welch US Census Records

Charles Welch Edward Welch George Welch James Welch John Welch Margaret Welch Robert Welch Thomas Welch William Welch

All Welch census records →

Browse More Surnames

Watts Weaver Webb Weber Webster Weeks Wells Welsh West Whalen Wheeler White

← Back to US Census Records