How many John Knapp census records do you have?

We have 2984 US Census records for John Knapp, from 1900 to 1950, across 50 states, DC, and 1 territory.

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

Yes. All John Knapp 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 Knapp?

We have John Knapp records from the 1900 through 1950 US Federal Census, across 50 states, DC, and 1 territory. Use the year and state filters to narrow your results.

How do I find John Knapp 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 Knapp?

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 Knapp — US Census Records & Model Tree

We found 2984 free census records for John Knapp across 6 census years (1900–1950), in 50 states, DC, and 1 territory and 646 counties. Each record includes our Model Tree — the same person linked across decades using machine learning, with per-link confidence scores.

John Knapp 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 2984 records for John Knapp US Census, ranked by Model Tree richness

No records match your filters.

Year	Name	Age	Location	Birthplace	Occupation	Relation
1940	John Knapp	24	Coles-County, Illinois	Illinois	Farm Laborer	Head
1930	John Knapp		Edmunds, South Dakota	South Dakota	Teamster	Son
1920	John Knapp		Emmons, North Dakota	South Dakota	Farmer	Head
1930	John Knapp		Queens, New York	New York	None	Son
1920	John Knapp		Tioga, Pennsylvania	Pennsylvania	None	Son
1940	John M. Knapp	24	Stearns-County, Minnesota	Minnesota	—	Son
1930	John Knapp		Cook, Illinois	Illinois	—	Son
1920	John Knapp		Philadelphia, Pennsylvania	Pennsylvania	—	Son
1940	John G. B. Knapp	49	Aitkin-County, Minnesota	Pennsylvania	Farmer	Head
1940	John E. Knapp	11	Cherokee-County, Kansas	Kansas	—	Son
1930	John Knapp		Steuben, New York	New York	—	Son
1940	John Jr. Knapp	24	Somerset-County, Pennsylvania	Pennsylvania	Miner	Son
1940	John Knapp	19	Milwaukee-County, Wisconsin	Wisconsin	New Worker	Son
1940	John Knapp	44	Somerset-County, Pennsylvania	Czechoslovakia	Miner	Head
1940	John Knapp	47	Hartford-County, Connecticut	Poland	Polisher	Head
1940	John Jr Knapp	10	Cambria-County, Pennsylvania	Pennsylvania	—	Son
1940	John Knapp	18	Marin-County, California	California	—	Son
1930	John P. Knapp		Portage, Ohio	Ohio	Farmer	Son
1940	John Knapp	19	Benzie-County, Michigan	Michigan	—	Son
1940	John R. Knapp	19	San-Bernardino-County, California	California	—	Son
1940	John Knapp	45	Silver-Bow-County, Montana	Montana	Miner	Head
1910	John F. Jr. Knapp		Winona, Minnesota	Wisconsin	Salesman	Head
1930	John H Knapp		Orange, New York	New York	—	Head
1940	John Knapp	48	Wayne-County, Michigan	Poland	Carpenter	Head
1940	John E. Knapp	45	Westchester-County, New York	NEW YORK	Policeman	Head
1920	John J Knapp		Philadelphia, Pennsylvania	Pennsylvania	—	Son
1940	John Knapp	47	Richland-County, Ohio	Czechoslovakia	Moulder	Head
1930	John Knapp		Wayne, Michigan	Michigan	Assembling	Head
1910	John Knapp		Passaic, New Jersey	Austria	Laborer	Head
1930	John S. Knapp		Warren, Pennsylvania	Pennsylvania	—	Son

Load More John Knapp Census Records

About John Knapp US Census Records & Model Tree

We've indexed 2984 free, proprietary US Census records for John Knapp across 1900–1950, covering 50 states, DC, and 1 territory: 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, Puerto Rico, 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 2984 US Census records for John Knapp, from 1900 to 1950, across 50 states, DC, and 1 territory.
: 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 Knapp'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 Knapp 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 Knapp records from the 1900 through 1950 US Federal Census, across 50 states, DC, and 1 territory. 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.