How many John Mulligan census records do you have?

We have 3751 US Census records for John Mulligan, from 1900 to 1950, across 49 states and DC.

What's in a John Mulligan 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 Mulligan'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 Mulligan census records free?

Yes. All John Mulligan 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 Mulligan?

We have John Mulligan 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 John Mulligan 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 Mulligan?

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 Mulligan — US Census Records & Model Tree

We found 3751 free census records for John Mulligan across 6 census years (1900–1950), in 49 states and DC and 514 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Mulligan 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 3751 records for John Mulligan US Census, ranked by Model Tree richness

No records match your filters.

Year	Name	Age	Location	Birthplace	Occupation	Relation
1920	John S. Mulligan		Salem, New Jersey	Scotland	—	Son
1940	John Mulligan	25	Carbon-County, Pennsylvania	Pennsylvania	Laborer	Son
1940	John Mulligan	21	Suffolk-County, Massachusetts	Massachusetts	Drug Clerk	Son
1920	John R Mulligan		Providence, Rhode Island	Scotland	Tool Maker	Son
1940	John Jr. Mulligan	32	Passaic-County, New Jersey	New Jersey	Accountant	Son
1940	John Mulligan	43	Cook-County, Illinois	Illinois	Milkman	Head
1940	John J Mulligan	21	Rensselaer-County, New York	New York	Laborer	Son
1930	John Mulligan		New York, New York	New York	Clerk	Son
1940	John M. Mulligan	27	Champaign-County, Illinois	Illinois	Clerk	Son
1940	John Mulligan	66	Passaic-County, New Jersey	New Jersey	Jacquard Weaver	Head
1910	John Mulligan		New York, New York	Ireland	Starter	Head
1940	John Mulligan	51	Camden-County, New Jersey	Pennsylvania	Fireman	Head
1920	John Mulligan		Salem, New Jersey	Scotland	Fireman	Head
1940	John Mulligan	59	Queens-County, New York	New York	—	Head
1930	John Mulligan		Westchester, New York	Connecticut	Chauffeur	Head
1920	John Mulligan		New York, New York	Ireland	Retired	Head
1940	John E Mulligan	44	Westchester-County, New York	New York	Accountant	Head
1930	John F. Mulligan		Allegheny, Pennsylvania	Maryland	Machinist	Head
1930	John Mulligan		Allegheny, Pennsylvania	Pennsylvania	Crane Man	Head
1920	John Mulligan		Queens, New York	New York	Foreman	Head
1940	John W. Mulligan	60	Franklin-County, Ohio	Ohio	Foreman	Head
1930	John F Mulligan		Norfolk, Massachusetts	Massachusetts	Steam Fitter	Head
1930	John J. Mulligan		Alameda, California	Ireland	Hostler	Head
1940	John E. Mulligan	73	Suffolk-County, Massachusetts	Massachusetts	Farm	Head
1940	John H Mulligan	51	Worcester-County, Massachusetts	Vermont	Farmer	Head
1930	John Mulligan		New York, New York	Ireland	—	Head
1910	John Mulligan		Essex, New Jersey	New Jersey	—	Son
1910	John Mulligan		Salt Lake, Utah	Illinois	Conductor	Head
1930	John Mulligan		Allegheny, Pennsylvania	Pennsylvania	Stationary Fireman	Son
1940	John Mulligan	44	Hudson-County, New Jersey	New Jersey	Shipping Clerk	Head

Load More John Mulligan Census Records

About John Mulligan US Census Records & Model Tree

We've indexed 3751 free, proprietary US Census records for John Mulligan across 1900–1950, covering 49 states and DC: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Hawaii, 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 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 3751 US Census records for John Mulligan, from 1900 to 1950, across 49 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 Mulligan'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 Mulligan 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 Mulligan 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.

Other Mulligan US Census Records

James Mulligan Mary Mulligan

All Mulligan census records →

Browse More Surnames

Morton Moss Moyer Mueller Mullen Muller Mullins Murdock Murphy Murray Myers Nash

← Back to US Census Records