JL
John Larson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Knox-County, Illinois
Our Model Tree links this John Larson across the 1920, 1930 and 1940 US Censuses in Knox-County, Illinois (XGBoost, ~Confirmed), with identified parents Charles & Charles — first a head (b.~1916), then head of a 4-person household.
Age 24
b. ~1916
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Knox-County, Illinois |
| Surname | Larson |
| Given Name | John A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Victoria Twp. |
| 1935 Residence (County) | Knox |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farmer |
| Township / Ward | Victoria Twp |
| Est. Birth Year | ~1916 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Larson | Head | — | 24 | ~1916 |
| John Larson | Son | — | 3 | ~1937 |
| Jack Larson | Son | — | 1 | ~1939 |
| Dorothy Larson | Spouse | — | 20 | ~1920 |
Census Appearances
1920
Knox, Illinois
Son, age 4
Knox, Illinois · implied b. ~1916 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Knox, Illinois
Son, age 14
Knox, Illinois · implied b. ~1916 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | John A |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Knox-County, Illinois
Head, age 24
Knox-County, Illinois · implied b. ~1916 — 4 household members
| Surname | Larson |
| Given Name | John A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Victoria Twp. |
| 1935 Residence (County) | Knox |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 60 |
| Income (1939) | 0 |
| Highest Grade | H-2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links John Larson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Charles Larson (~0.92 confidence) and father Charles Larson (~0.92 confidence) and mother Carrie Larson (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Charles Larson
b. ~1867
Source father
● Household
· direct · ~0.92
Father
Charles Larson
b. ~1868
Source father
● Household
· direct · ~0.92
Mother
Carrie Larson
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Larson
Head · 1940 · age 24 · b. ~1916 · Illinois
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Knox-County, Illinois
Open full size
1940 US Federal Census — Knox-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00827-00420)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Anderson | 34 | Wife | — | Illinois |
| 2 | Robert Dean Anderson | 12 | Son | — | Illinois |
| 3 | Charles Andrew Anderson | 4 | Son | — | Illinois |
| 4 | George Tucker | 28 | Head | Laborer | Illinois |
| 5 | Helen Tucker | 21 | Wife | — | Illinois |
| 6 | Nancy Marie Tucker | 6 | Daughter | — | Illinois |
| 7 | Dorothy Irene Tucker | 4 | Daughter | — | Illinois |
| 8 | Frank Coleman | 53 | Head | Farmer | Illinois |
| 9 | Susie Coleman | 51 | Sister | — | Illinois |
| 10 | Charles Larson | 73 | Head | Farmer | Illinois |
| 11 | Carrie Larson | 57 | Wife | — | Illinois |
| 12 | Edna Fogelsong | 41 | Daughter | Music Teacher | Illinois |
| 13 | Jennie Creel | 39 | Daughter | — | Illinois |
| 14 | Duke Creel | 40 | Son-in-law | Laborer | Kentucky |
| 15 | Verne Rae Catton | 20 | Grandson | Laborer | Illinois |
| 16 | Charles Robert Smith | 13 | Grandson | — | Illinois |
| 17 | John A. Larson THIS PERSON | 24 | Head | Farmer | Illinois |
| 18 | Dorothy Irene Larson | 20 | Wife | — | Illinois |
| 19 | John J. Larson | 3 | Son | — | Illinois |
| 20 | Jack Hardy Larson | 1 | Son | — | Illinois |
| 21 | James G. Mustain | 70 | Head | Farmer | Illinois |
| 22 | Nellie Mustain | 70 | Wife | — | Illinois |
| 23 | Bernard Camp | 30 | Head | Trucker | Illinois |
| 24 | Lorene Camp | 27 | Wife | — | Illinois |
| 25 | Rosalie Camp | 5 | Daughter | — | Illinois |
| 26 | Willie Murphy | 40 | Head | Laborer | Illinois |
| 27 | Pearl Murphy | 42 | Wife | — | Illinois |
| 28 | Cleo Murphy | 15 | Daughter | — | Illinois |
| 29 | Shirley Murphy | 11 | Daughter | — | Illinois |
| 30 | Betty Lou Murphy | 4 | Daughter | — | Illinois |
| 31 | Clifford Underwood | 36 | Head | Mechanic | Indiana |
| 32 | Marie Underwood | 34 | Wife | — | Illinois |
| 33 | Patty Underwood | 8 | Daughter | — | Illinois |
| 34 | Gene Underwood | 6 | Son | — | Illinois |
| 35 | Martha Underwood | 4 | Daughter | — | Illinois |
| 36 | Shirley Underwood | 2 | Daughter | — | Illinois |
| 37 | Forrest J. Scott | 30 | Head | Farmer | Illinois |
| 38 | Ethel Scott | 28 | Wife | — | Illinois |
| 39 | Sybil Scott | 4 | Daughter | — | Illinois |
| 40 | Myrna Scott | 1 | Daughter | — | Illinois |
Pedigree Summary
John
Gen 1 · 3 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)