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Oscar Olson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Brookings-County, South Dakota
Our Model Tree links this Oscar Olson across the 1920, 1930 and 1940 US Censuses in Brookings-County, South Dakota (XGBoost, ~Confirmed), with identified parents Thomas & Matilda — first a head (b.~1903), then head of a 8-person household.
Age 37
b. ~1903
Male
Head
Born: South Dakota
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Brookings-County, South Dakota |
| Surname | Olson |
| Given Name | Oscar |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Brookings |
| Additional Details | |
| Occupation | Laborer |
| Industry | Shelter Belt |
| Class of Worker | GW |
| Hours Worked | 0 |
| Income (1939) | 481 |
| Highest Grade | No 8 |
| 1935 Residence | South Dakota |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
| Occupation | Laborer |
| Township / Ward | Brookings |
| Est. Birth Year | ~1903 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Oscar | Age | Birth yr |
|---|---|---|---|---|
| Cleo Olson | Daughter | — | 6 | ~1934 |
| Phyllis Olson | Daughter | — | 14 | ~1926 |
| Frances Olson | Daughter | — | 16 | ~1924 |
| Oscar Olson | Head | — | 37 | ~1903 |
| Wayne Olson | Son | — | 1 | ~1939 |
| Darrel Olson | Son | — | 9 | ~1931 |
| Willard Olson | Son | — | 12 | ~1928 |
| Idella Olson | Spouse | — | 33 | ~1907 |
Census Appearances
1920
Brookings, South …
Son, age 17
Brookings, South Dakota · implied b. ~1903 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olson |
| Given Name | Oscar O. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | South Dakota |
| Father's Birthplace | Minnesota |
| Mother's Birthplace | South Dakota |
| Occupation | Farm laborer |
| Industry | working out |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1930
Brookings, South …
Head, age 27
Brookings, South Dakota · implied b. ~1903
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Olson |
| Given Name | Oscar |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | South Dakota |
| Age at First Marriage | 20 |
| Father's Birthplace | South Dakota |
| Mother's Birthplace | South Dakota |
| Occupation | Farmer |
| Industry | General |
| Class of Worker | O |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Veteran | No |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
1940
Brookings-County, South …
Head, age 37
Brookings-County, South Dakota · implied b. ~1903 — 8 household members
| Surname | Olson |
| Given Name | Oscar |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | South Dakota |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Brookings |
| Occupation | Laborer |
| Industry | Shelter Belt |
| Class of Worker | GW |
| Hours Worked | 0 |
| Income (1939) | 481 |
| Highest Grade | No 8 |
| 1935 Residence | South Dakota |
| Birth State | South Dakota |
| Birth Country | United States |
| Birthplace (normalized) | south dakota |
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 Olson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Thomas Olson (~0.92 confidence) and mother Matilda Olson (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Thomas Olson
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Matilda Olson
b. ~1885
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Oscar Olson
Head · 1940 · age 37 · b. ~1903 · South Dakota
★ 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 — Brookings-County, South Dakota
Open full size
1940 US Federal Census — Brookings-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03848-00497)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Monroe Bebo | 24 | Head | Cabbie | South Dakota |
| 42 | Hall Bebo | 20 | Son | Truck Driver | Minnesota |
| 43 | Delbert Bebo | 15 | Son | — | South Dakota |
| 44 | Donna Bebo | 13 | Daughter | — | South Dakota |
| 45 | Carl Gunderson | 57 | Head | Proprietor | South Dakota |
| 46 | Clara Gunderson | 55 | Wife | Cook | South Dakota |
| 47 | Morris Gunderson | 20 | Son | Clerk & Waiter | South Dakota |
| 48 | Lavern Gunderson | 17 | Son | Pinsetter | South Dakota |
| 49 | Fred Bakken | 26 | Head | Laborer | South Dakota |
| 50 | Dorothy Bakken | 25 | Wife | — | Minnesota |
| 51 | Roger Bakken | 5 | Son | — | Minnesota |
| 52 | Anna Bakken | 57 | Head | — | Minnesota |
| 53 | Marian Thaalworth | 35 | Head | Mechanic | South Dakota |
| 54 | Mona Thaalworth | 37 | Wife | — | South Dakota |
| 55 | Donald Thaalworth | 6 | Son | — | South Dakota |
| 56 | James Thaalworth | 62 | Father | — | Iowa |
| 57 | Oscar Olson THIS PERSON | 37 | Head | Laborer | South Dakota |
| 58 | Idella Olson | 33 | Wife | — | South Dakota |
| 59 | Frances Olson | 16 | Daughter | Waitress | South Dakota |
| 60 | Phyllis Olson | 14 | Daughter | — | South Dakota |
| 61 | Willard Olson | 12 | Son | — | South Dakota |
| 62 | Darrel Olson | 9 | Son | — | South Dakota |
| 63 | Cleo Olson | 6 | Daughter | — | South Dakota |
| 64 | Wayne Olson | 1 | Son | — | South Dakota |
| 65 | Victor Peterson | 37 | Head | Mechanic | South Dakota |
| 66 | Marie Peterson | 28 | Wife | — | Illinois |
| 67 | Victor Peterson | 6 | Son | — | South Dakota |
| 68 | Jennie Groves | 68 | Mother | — | Illinois |
| 69 | Marian Falconer | 31 | Head | — | Wisconsin |
| 70 | Irene Falconer | 10 | Daughter | — | South Dakota |
| 71 | Leroy Falconer | 9 | Son | — | South Dakota |
| 72 | Fred Clotan | 55 | Head | — | South Dakota |
| 73 | Ellen Clotan | 46 | Wife | Cook | Wisconsin |
| 74 | William Mattis | 81 | Head | — | Pennsylvania |
| 75 | Mary Mattis | 68 | Wife | — | Iowa |
| 76 | Russell Mattis | 23 | Son | Common Labor | Iowa |
| 77 | Emmitt Carmody | 19 | Son | Gardner | South Dakota |
| 78 | P. S. Jones | 73 | Head | — | Ohio |
| 79 | Anna Mel Jones | 49 | Wife | — | South Dakota |
| 80 | Betty Jane Jones | 19 | Daughter | Secretary | South Dakota |
Pedigree Summary
Oscar
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)