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Oscar Olson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cerro-Gordo-County, Iowa
Our Model Tree links this Oscar Olson across the 1910, 1920, 1930 and 1940 US Censuses in Cerro-Gordo-County, Iowa (XGBoost, ~Confirmed), with identified parents Frank & Alexander — first a head (b.~1900), then head of a 4-person household.
Age 40
b. ~1900
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cerro-Gordo-County, Iowa |
| Surname | Olson |
| Given Name | Oscar R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Britt |
| 1935 Residence (County) | Hancock |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farming |
| Class of Worker | OA |
| Hours Worked | 78 |
| Income (1939) | 0 |
| Highest Grade | C 2 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Mason Township |
| Est. Birth Year | ~1900 |
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 Oscar | Age | Birth yr |
|---|---|---|---|---|
| Carolyn Olson | Daughter | — | 2 | ~1938 |
| Ramona Olson | Daughter | — | 3 | ~1937 |
| Oscar Olson | Head | — | 40 | ~1900 |
| Verola Olson | Spouse | — | 29 | ~1911 |
Census Appearances
1910
Hancock, Iowa
Other, age 20
Hancock, Iowa · implied b. ~1890 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olson |
| Given Name | Oscar |
| Relationship to Head | Boarder |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | No. Norwegian |
| Mother's Birthplace | Illinois |
| Occupation | Laborer |
| Industry | Farm drainage |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Hancock, Iowa
Son, age 25
Hancock, Iowa · implied b. ~1895 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olson |
| Given Name | Oscar R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Laborer |
| Industry | Section |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Hancock, Iowa
Son, age 30
Hancock, Iowa · implied b. ~1900 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olson |
| Given Name | Oscar R. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Laborer |
| Industry | General farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Cerro-Gordo-County, Iowa
Head, age 40
Cerro-Gordo-County, Iowa · implied b. ~1900 — 4 household members
| Surname | Olson |
| Given Name | Oscar R. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Britt |
| 1935 Residence (County) | Hancock |
| Occupation | Farmer |
| Industry | Farming |
| Class of Worker | OA |
| Hours Worked | 78 |
| Income (1939) | 0 |
| Highest Grade | C 2 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Olson (~0.92 confidence) and father Alexander Peterson (~0.92 confidence) and mother Terve Peterson (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Olson
b. ~1865
Source father
● Household
· direct · ~0.92
Father
Alexander Peterson
b. ~1869
Source father
● Household
· direct · ~0.92
Mother
Terve Peterson
b. ~1869
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Oscar Olson
Head · 1940 · age 40 · b. ~1900 · Iowa
★ 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 — Cerro-Gordo-County, Iowa
Open full size
1940 US Federal Census — Cerro-Gordo-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01146-00395)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Virginia P. Nelson | 15 | daughter | — | Iowa |
| 2 | Oscar R. Olson THIS PERSON | 40 | Head | Farmer | Iowa |
| 3 | Verola L. Olson | 29 | wife | — | Iowa |
| 4 | Ramona Olson | 3 | daughter | — | Iowa |
| 5 | Carolyn Olson | 2 | daughter | — | Iowa |
| 6 | Alice E. Donough | 62 | Head | — | Iowa |
| 7 | Clement Donough | 32 | son | Farm Laborer | Iowa |
| 8 | Robert Donough | 18 | son | Farm Laborer | Iowa |
| 9 | Catherine Donough | 23 | daughter | — | Iowa |
| 10 | Herbert Donough | 12 | Hired Hand | — | Minnesota |
| 11 | Joseph Mcdonough | 26 | Head | Farm Laborer | Iowa |
| 12 | Lyle Hill | 39 | Head | Farmer | Iowa |
| 13 | Marjorie Hill | 33 | wife | — | Iowa |
| 14 | Jack Hill | 7 | son | — | Iowa |
| 15 | Joanne Hill | 5 | daughter | — | Iowa |
| 16 | Donald Hill | 2 | son | — | Iowa |
| 17 | Lyell Ives | 45 | Head | Laborer & Meat Packer | Iowa |
| 18 | Marie Ives | 35 | wife | — | Iowa |
| 19 | Laverne L. Ives | 15 | son | — | Iowa |
| 20 | Lavonne Ives | 14 | daughter | — | Iowa |
| 21 | Shirley Ives | 13 | daughter | — | Iowa |
| 22 | Lila Lee Ives | 11 | daughter | — | Minnesota |
| 23 | Raymond Ives | 9 | son | — | Iowa |
| 24 | Donna Ives | 7 | daughter | — | Iowa |
| 25 | Robert Ives | 5 | son | — | Iowa |
| 26 | Jeanette Ives | 3 | daughter | — | Iowa |
| 27 | Frank N. Tuthill | 69 | Head | Farmer | Illinois |
| 28 | Lissie Tuthill | 62 | wife | — | Iowa |
| 29 | Earl Tuthill | 42 | son | — | Iowa |
| 30 | Marvyn Renshaw | 32 | Head | Painter | Iowa |
| 31 | Blanche Renshaw | 33 | wife | Farmer | Iowa |
| 32 | Fred O. Renshaw | 4 | son | — | Iowa |
| 33 | Patrick K. Renshaw | 3 | daughter | — | Iowa |
| 34 | Reuben Kirchner | 20 | Hired Hand | Laborer | Minnesota |
| 35 | Thomas W. Summerhayes | 36 | Head | Salesman | South Dakota |
| 36 | Grace H. Summerhayes | 38 | wife | — | Minnesota |
| 37 | Shirley Summerhayes | 12 | daughter | — | Iowa |
| 38 | Jack Summerhayes | 10 | son | — | Iowa |
| 39 | Betty Summerhayes | 6 | daughter | — | Iowa |
| 40 | Albert Sazma | 37 | Head | Sausage Smoker | Minnesota |
Pedigree Summary
Oscar
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)