JL
John Larson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Rock-Island-County, Illinois
Our Model Tree links this John Larson across the 1920, 1930 and 1940 US Censuses in Rock-Island-County, Illinois (XGBoost, ~Confirmed), with identified parents Oscar & Laura — first a head (b.~1904), then head of a 3-person household.
Age 36
b. ~1904
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Rock-Island-County, Illinois |
| Surname | Larson |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Coe Township |
| 1935 Residence (County) | Rock Island |
| Additional Details | |
| Occupation | Assembler |
| Industry | Assembly Line |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Assembler |
| Township / Ward | Coe Township |
| Est. Birth Year | ~1904 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Larson | Head | — | 36 | ~1904 |
| Wayne Larson | Son | — | 2 | ~1938 |
| Ruth Larson | Spouse | — | 35 | ~1905 |
Census Appearances
1920
Rock Island, …
Son, age 16
Rock Island, Illinois · implied b. ~1904 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Rock Island, …
Head, age 26
Rock Island, Illinois · implied b. ~1904 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larson |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 25 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Germany |
| Occupation | Agent |
| Industry | Oil Company |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 3500 |
| Radio Set | R |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Rock-Island-County, Illinois
Head, age 36
Rock-Island-County, Illinois · implied b. ~1904 — 3 household members
| Surname | Larson |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 36 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Coe Township |
| 1935 Residence (County) | Rock Island |
| Occupation | Assembler |
| Industry | Assembly Line |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 496 |
| Highest Grade | H-4 |
| 1935 Residence | Same House |
| 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 Oscar Larson (~0.92 confidence) and mother Laura Larson (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Oscar Larson
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Laura Larson
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Larson
Head · 1940 · age 36 · b. ~1904 · 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 — Rock-Island-County, Illinois
Open full size
1940 US Federal Census — Rock-Island-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00874-00205)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Mary Elson | 54 | Wife | — | Iowa |
| 2 | Joe Elson | 27 | Head | Farmer | Iowa |
| 3 | Forrest Cain | 52 | Head | Farmer | Illinois |
| 4 | Hazel Cain | 49 | Wife | — | Illinois |
| 5 | Lois Cain | 18 | Daughter | — | Illinois |
| 6 | Wilton Cain | 14 | Son | — | Illinois |
| 7 | Delbert Cain | 8 | Son | — | Illinois |
| 8 | Myron Bambeur | 23 | Hired Hand | Farm Laborer | Illinois |
| 9 | Will Cain | 74 | Father | — | Illinois |
| 10 | Caroline Cain | 73 | Mother | — | Illinois |
| 11 | Orville Farwell | 60 | Head | Farmer | Illinois |
| 12 | Hannah Farwell | 57 | Wife | — | Illinois |
| 13 | Wayne Farwell | 15 | Son | — | Illinois |
| 14 | Donna Mae Farwell | 9 | Daughter | — | Illinois |
| 15 | John Morley | 55 | Hired Hand | — | Arkansas |
| 16 | Lucy Armstrong | 74 | Head | — | Illinois |
| 17 | Sarah Armstrong | 39 | Daughter | — | Illinois |
| 18 | Jacob Riewerts | 65 | Head | Farmer | Iowa |
| 19 | Mary Riewerts | 59 | Wife | — | Illinois |
| 20 | Harold Riewerts | 36 | Son | Farm Laborer | Illinois |
| 21 | Ruth Riewerts | 22 | Daughter | Secretary | Illinois |
| 22 | Thomas A. Dulaney | 36 | Head | Farmer | Missouri |
| 23 | Doris Dulaney | 37 | Wife | — | Illinois |
| 24 | Virgil Dulaney | 11 | Son | — | Illinois |
| 25 | Virgil Phillis | 43 | Head | Machine Operator | Ohio |
| 26 | Helen Phillis | 40 | Wife | — | Illinois |
| 27 | Virginia Phillis | 13 | Daughter | — | Illinois |
| 28 | Forrest Phillis | 9 | Son | — | Illinois |
| 29 | Philip Phillis | 8 | Son | — | Illinois |
| 30 | Gilbert Phillis | 6 | Son | — | Illinois |
| 31 | Dale Phillis | 2 | Son | — | Illinois |
| 32 | John Larson THIS PERSON | 36 | Head | Assembler | Illinois |
| 33 | Ruth Larson | 35 | Wife | — | Illinois |
| 34 | Wayne Larson | 2 | Son | — | Illinois |
| 35 | John Winterfeldt | 56 | Head | Farmer | Illinois |
| 36 | Hazel M. Winterfeldt | 49 | Wife | — | Illinois |
| 37 | Leslie Winterfeldt | 19 | Son | Farm Laborer | Illinois |
| 38 | Lyle Winterfeldt | 18 | Son | — | Illinois |
| 39 | Charles F. Heah | 65 | Head | Farmer | Illinois |
| 40 | Martha A. Heah | 66 | Wife | — | Illinois |
Pedigree Summary
John
Gen 1 · 2 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)