How many Harold Martin census records do you have?

We have 5417 US Census records for Harold Martin, from 1900 to 1950, across 50 states and DC.

What's in a Harold Martin census record?

You'll see Harold'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 Harold Martin'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 Harold Martin census records free?

Yes. All Harold Martin 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 Harold Martin?

We have Harold Martin 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 Harold Martin 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 Harold Martin?

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.

Harold Martin — US Census Records & Model Tree

We found 5417 free census records for Harold Martin across 6 census years (1900–1950), in 50 states and DC and 1353 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

Harold Martin Census Records by State & County

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Showing of 5417 records for Harold Martin US Census, ranked by Model Tree richness

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Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	Harold Martin	34	Putnam-County, Ohio	Ohio	Laborer	Head
1940	Harold Martin	45	Vanderburgh-County, Indiana	Indiana	Farmer	Head
1940	Harold W Martin	24	Logan-County, Illinois	Nebraska	Farm Laborer	Son
1930	Harold Martin		Okmulgee, Oklahoma	Oklahoma	None	Son
1940	Harold Martin	28	Ohio-County, Kentucky	Kentucky	Tractor Driver	Head
1940	Harold A. Martin	28	Plymouth-County, Massachusetts	Vermont	Truck Driver	Son
1940	Harold Ab Martin	23	Nodaway-County, Missouri	Missouri	—	Son
1940	Harold Martin	30	Keokuk-County, Iowa	Iowa	Farmer	Head
1940	Harold Martin	22	Jackson-County, Ohio	Ohio	Clerk	Son
1940	Harold P. Martin	35	Hennepin-County, Minnesota	Norway	Laborer	Head
1940	Harold Martin	21	Licking-County, Ohio	Ohio	Farm Laborer	Son
1940	Harold Martin	22	Sumner-County, Kansas	Kansas	—	Son
1930	Harold G Martin		Providence, Rhode Island	Rhode Island	Steamfitter	Head
1930	Harold Martin		Cuyahoga, Ohio	Ohio	—	Son
1940	Harold W. Martin	26	Clinton-County, Ohio	Indiana	Recreation	Head
1940	Harold S. Martin	30	Butler-County, Iowa	Iowa	Clerk	Head
1940	Harold D. Martin	39	Steuben-County, Indiana	Indiana	Wholesale Grocery Salesman	Head
1940	Harold Martin	26	Sandusky-County, Ohio	Ohio	Farmer	Son
1940	Harold Martin	24	Floyd-County, Georgia	Georgia	Farmer	Head
1920	Harold P Martin		Dubuque, Iowa	Iowa	Delivery Boy	Son
1940	Harold Martin	23	Saginaw-County, Michigan	Minnesota	Sub. Clerk	Head
1940	Harold Martin	32	Creek-County, Oklahoma	Oklahoma	Pumper	Head
1940	Harold Martin	30	Monmouth-County, New Jersey	New Jersey	Registered Nurse	Head
1940	Harold Martin	31	Jefferson-County, Kansas	Kansas	Same Place	Son
1940	Harold L. Martin	26	Linn-County, Iowa	Iowa	Shipping Clerk / Accountant	Son
1940	Harold G. Martin	24	Stark-County, Ohio	Ohio	Contractor Helping Father	Son
1930	Harold J Martin		Licking, Ohio	Ohio	Painter	Head
1940	Harold Martin	21	Wyoming-County, New York	New York	—	Son
1940	Harold Martin	36	Wayne-County, Michigan	Ohio	Trucker	Head
1940	Harold G. Martin	42	Berkshire-County, Massachusetts	Vermont	Service Man	Head

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About Harold Martin US Census Records & Model Tree

We've indexed 5417 free, proprietary US Census records for Harold Martin 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 Harold 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 5417 US Census records for Harold Martin, from 1900 to 1950, across 50 states and DC.
: You'll see Harold'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 Harold Martin'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 Harold Martin 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 Harold Martin 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 Martin US Census Records

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