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Oscar Larson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Carbon-County, Montana
Our Model Tree links this Oscar Larson across the 1920, 1930 and 1940 US Censuses in Carbon-County, Montana (XGBoost, ~Confirmed), with identified parents Paul & Paul — first a son (b.~1920), then head of a 6-person household.
Age 20
b. ~1920
Male
Son
Born: Montana
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Carbon-County, Montana |
| Surname | Larson |
| Given Name | Oscar J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | School District 2 |
| 1935 Residence (County) | Carbon |
| Additional Details | |
| Occupation | Truck Driver |
| Industry | Reforestation |
| Class of Worker | GW |
| Hours Worked | 12 |
| Income (1939) | 130 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
| Occupation | Truck Driver |
| Township / Ward | School District 2 |
| Est. Birth Year | ~1920 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Oscar | Age | Birth yr |
|---|---|---|---|---|
| Paul Larson | Son | — | 14 | ~1926 |
| Paul Larson | Head | — | 48 | ~1892 |
| Robert Larson | Son | — | 7 | ~1933 |
| Melvina Larson | Spouse | — | 45 | ~1895 |
| Oscar Larson | Son | — | 20 | ~1920 |
| Walter Larson | Son | — | 10 | ~1930 |
Census Appearances
1920
Carbon, Montana
Son, age
Carbon, Montana · implied b. ~1920 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larsen |
| Given Name | Oscar J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | South Dakota |
| Mother's Birthplace | Wisconsin |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1930
Carbon, Montana
Son, age 10
Carbon, Montana · implied b. ~1920 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Larsen |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Montana |
| Father's Birthplace | Nebraska |
| Mother's Birthplace | Wisconsin |
| Can Read/Write | Yes |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
1940
Carbon-County, Montana
Son, age 20
Carbon-County, Montana · implied b. ~1920 — 6 household members
| Surname | Larson |
| Given Name | Oscar J |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Montana |
| 1935 Residence (City) | School District 2 |
| 1935 Residence (County) | Carbon |
| Occupation | Truck Driver |
| Industry | Reforestation |
| Class of Worker | GW |
| Hours Worked | 12 |
| Income (1939) | 130 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Montana |
| Birth Country | United States |
| Birthplace (normalized) | montana |
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 Oscar Larson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Paul Larsen (~0.92 confidence) and father Paul Larsen (~0.92 confidence) and father Paul Larson (~0.92 confidence) and mother Melvina Larson (~0.92 confidence) and mother Nelsina Larsen (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Paul Larsen
b. ~1893
Source father
● Household
· direct · ~0.92
Father
Paul Larsen
b. ~1893
Source father
● Household
· direct · ~0.92
Father
Paul Larson
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Melvina Larson
b. ~1895
Source mother
● Household
· direct · ~0.92
Mother
Nelsina Larsen
b. ~1896
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Oscar Larson
Son · 1940 · age 20 · b. ~1920 · Montana
★ You are viewing this record
Sibling
Robert Larson
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Larson
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Larson
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Carbon-County, Montana
Open full size
1940 US Federal Census — Carbon-County, Montana
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02213-00127)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Christina M Hayes | 21 | Wife | — | Montana |
| 42 | Hessie M Hayes | 1 | Daughter | 0 | Montana |
| 43 | Samuel C. Witt | 55 | Head | Farm Operator | Missouri |
| 44 | Jennie Witt | 55 | Wife | — | Montana |
| 45 | Marvin Witt | 25 | Son | Farm Supervisor | Montana |
| 46 | Pearl F Witt | 17 | Daughter | — | Montana |
| 47 | Stanley O Witt | 13 | Son | — | Montana |
| 48 | Arthur C Foust | 48 | Head | Farm Operator | Montana |
| 49 | Hattie A Foust | 46 | Wife | — | Missouri |
| 50 | J. Alfred Foust | 22 | Son | Farm Operator | Montana |
| 51 | Glenn W Foust | 20 | Son | Farm Laborer | Montana |
| 52 | Ralph D Foust | 9 | Son | — | Montana |
| 53 | Frank O. Gibbs | 46 | Head | Field Gauger | North Carolina |
| 54 | Elizabeth M. Gibbs | 48 | Wife | — | Colorado |
| 55 | Frank R. Gibbs | 13 | Son | — | Wyoming |
| 56 | Edith M Gibbs | 12 | Daughter | — | Wyoming |
| 57 | Milton R Gibbs | 6 | Son | — | Wyoming |
| 58 | William B. Currie | 39 | Head | Farm Operator | Montana |
| 59 | Eva H. Currie | 39 | Wife | — | Illinois |
| 60 | William R. Currie | 10 | Son | — | Montana |
| 61 | Joan F. Currie | 7 | Daughter | — | Montana |
| 62 | Robert A. Currie | 4 | Son | — | Montana |
| 63 | Jacob R. Wetch | 24 | Employee | Farm Laborer | Montana |
| 64 | Paul M. Larson | 48 | Head | Farm Operator | North Dakota |
| 65 | Melvina M. Larson | 45 | Wife | — | Wisconsin |
| 66 | Oscar J Larson THIS PERSON | 20 | Son | Truck Driver | Montana |
| 67 | Paul R Larson | 14 | Son | — | Montana |
| 68 | Walter C Larson | 10 | Son | — | Montana |
| 69 | Robert R. Larson | 7 | Son | — | Montana |
| 70 | Clyde Lyda | 26 | Head | Farm Operator | Montana |
| 71 | Lorraine L. Lyda | 21 | Wife | — | Montana |
| 72 | Dorris J. Lyda | 1 | Daughter | 0 | Montana |
| 73 | Verna M. Black | 11 | In-law | — | Montana |
| 74 | Detlev Thormahlen | 67 | Head | Farm Operator | Germany |
| 75 | Minna Thormahlen | 57 | Wife | — | Germany |
| 76 | John H. Thormahlen | 20 | Son | Farm Laborer | Montana |
| 77 | Albert C. Thormahlen | 18 | Son | Farm Laborer | Montana |
| 78 | Charles Thormahlen | 16 | Son | Farm Laborer | Montana |
| 79 | George Thormahlen | 13 | Son | — | Montana |
| 80 | Lawrence F. Larson | 25 | Head | Farm Operator | Montana |
Pedigree Summary
Oscar + 3 siblings
Gen 1 · 5 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)