How many John Mcdonnell census records do you have?

We have 2890 US Census records for John Mcdonnell, from 1900 to 1950, across 48 states and DC.

What's in a John Mcdonnell census record?

You'll see John'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 John Mcdonnell'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 John Mcdonnell census records free?

Yes. All John Mcdonnell 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 John Mcdonnell?

We have John Mcdonnell 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 John Mcdonnell 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 John Mcdonnell?

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.

John Mcdonnell — US Census Records & Model Tree

We found 2890 free census records for John Mcdonnell across 6 census years (1900–1950), in 48 states and DC and 485 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Mcdonnell 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 2890 records for John Mcdonnell US Census, ranked by Model Tree richness

No records match your filters.

Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	John C. Mcdonnell		Cascade, Montana	Montana	—	Son
1940	John Jr. Mcdonnell	26	Kings-County, New York	New York	40	Son
1940	John Mcdonnell	50	Clinton-County, Iowa	Iowa	Welder	Head
1940	John Mcdonnell	18	Clinton-County, Iowa	Iowa	Laborer	Son
1900	John Mcdonnell	47	Chesterfield, South Carolina	South Carolina	Farm Laborer	Head
1930	John Mcdonnell		Los Angeles, California	California	None	Son
1920	John Mcdonnell		Grafton, New Hampshire	New Hampshire	None	Son
1940	John Mcdonnell	15	Essex-County, New Jersey	New Jersey	—	Son
1920	John Mcdonnell		Bronx, New York	Ireland	—	Son
1910	John G. Mcdonnell		Owyhee, Idaho	California	Gen Manager	Head
1900	John Mcdonnell	30	Mills, Iowa	Wisconsin	Farmer	Head
1940	John Jr. Mcdonnell	15	Queens-County, New York	New York	—	Son
1940	John Mcdonnell	14	Hudson-County, New Jersey	New Jersey	—	Son
1940	John D. Jr. Mcdonnell	29	Park-County, Montana	Oregon	Farmer	Head
1930	John Mcdonnell		Blount, Tennessee	Tennessee	Laborer	Head
1940	John Henry Mcdonnell	32	Perry-County, Mississippi	Mississippi	—	Wife
1900	John Mcdonnell	37	Rockingham, Virginia	Virginia	Farm Laborer	Head
1940	John D. Mcdonnell	22	Dallas-County, Texas	Washington	—	Son
1930	John M Mcdonnell		Wayne, Michigan	Michigan	None	Son
1940	John O Mcdonnell	26	Middlesex-County, Massachusetts	Canada English	Salesman	Head
1910	John Mcdonnell		Essex, Massachusetts	Canada (Eng)	Carpenter	Head
1930	John Mcdonnell		Wayne, Michigan	Michigan	Accountant	Head
1940	John F. Jr. Mcdonnell	22	Sumner-County, Kansas	Kansas	New Worker	Son
1940	John Mcdonnell	14	Alameda-County, California	Virginia	Delivery Boy	Son
1940	John J. Mcdonnell	28	Queens-County, New York	Irish Free State	Porter	Head
1940	John Mcdonnell	21	Essex-County, New Jersey	New Jersey	Usher	Son
1940	John E. Mcdonnell	31	Ramsey-County, Minnesota	Minnesota	Laborer	Head
1940	John F. Mcdonnell	51	Sumner-County, Kansas	Kansas	Medical Doctor	Head
1940	John Mcdonnell	34	Cuyahoga-County, Ohio	Ohio	Principal Clerk	Head
1940	John Mcdonnell	45	Kings-County, New York	Ireland	Milkman	Husband

Load More John Mcdonnell Census Records

About John Mcdonnell US Census Records & Model Tree

We've indexed 2890 free, proprietary US Census records for John Mcdonnell 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, 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 John 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 2890 US Census records for John Mcdonnell, from 1900 to 1950, across 48 states and DC.
: You'll see John'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 John Mcdonnell'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 John Mcdonnell 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 John Mcdonnell 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.

Other Mcdonnell US Census Records

Mary Mcdonnell

All Mcdonnell census records →

Browse More Surnames

Mccormick Mccoy Mccullough Mcdaniel Mcdermott Mcdonald Mcdonough Mcdowell Mcelroy Mcfadden Mcfarland Mcgee

← Back to US Census Records