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Oscar Olson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Worth-County, Iowa
Our Model Tree links this Oscar Olson across the 1920, 1930 and 1940 US Censuses in Worth-County, Iowa (XGBoost, ~Confirmed), with identified parents John & Anna — first a head (b.~1894), then head of a 5-person household.
Age 46
b. ~1894
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Worth-County, Iowa |
| Surname | Olson |
| Given Name | Oscar S. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Danville twp. |
| 1935 Residence (County) | Worth |
| Additional Details | |
| Occupation | farmer |
| Industry | farm |
| Class of Worker | OA |
| Hours Worked | 70 |
| Income (1939) | 0 |
| Highest Grade | Hs 8 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Danville Twp |
| Est. Birth Year | ~1894 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Oscar | Age | Birth yr |
|---|---|---|---|---|
| Mavis Olson | Daughter | — | 3 | ~1937 |
| Esther Olson | Daughter | — | 2 | ~1938 |
| Oscar Olson | Head | — | 46 | ~1894 |
| Russell Low | Other | — | 22 | ~1918 |
| Mildred Olson | Spouse | — | 27 | ~1913 |
Census Appearances
1920
Worth, Iowa
Son, age 26
Worth, Iowa · implied b. ~1894 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olsen |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Worth, Iowa
Son, age 35
Worth, Iowa · implied b. ~1895 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Olsen |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Norway |
| Mother's Birthplace | Norway |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Worth-County, Iowa
Head, age 46
Worth-County, Iowa · implied b. ~1894 — 5 household members
| Surname | Olson |
| Given Name | Oscar S. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Danville twp. |
| 1935 Residence (County) | Worth |
| Occupation | farmer |
| Industry | farm |
| Class of Worker | OA |
| Hours Worked | 70 |
| Income (1939) | 0 |
| Highest Grade | Hs 8 |
| 1935 Residence | Same house |
| 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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Olsen (~0.92 confidence) and mother Anna Olsen (~0.92 confidence) and father Melvin Thorsland (~0.50 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.78
Father
John Olsen
b. ~1855
Source father
● Household
· direct · ~0.92
Mother
Anna Olsen
b. ~1863
Source mother
● Household
· direct · ~0.92
Father
Melvin Thorsland
b. ~1908
Source father
● Household
· direct · ~0.5
This person
Anchor record
Oscar Olson
Head · 1940 · age 46 · b. ~1894 · 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 — Worth-County, Iowa
Open full size
1940 US Federal Census — Worth-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01217-00243)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Della H. Boutelle | 65 | Wife | — | Michigan |
| 42 | Gustav H. Schultz | 44 | Head | Farmer | Nebraska |
| 43 | Lena A. Schultz | 33 | Wife | — | Missouri |
| 44 | Dale V. Schultz | 11 | Son | — | Nebraska |
| 45 | Peter Peterson | 56 | Head | Farmer | Denmark |
| 46 | Christian Peterson | 54 | Brother | Farmer | Denmark |
| 47 | Delia H. Lines | 44 | Housekeeper | Housekeeper | Iowa |
| 48 | Roy W. Gertz | 28 | Head | Farmer | Iowa |
| 49 | O. Caroline Gertz | 24 | Wife | — | Iowa |
| 50 | Thora|Thompsa Gertz | 5 | Daughter | — | Iowa |
| 51 | Viola M. Gertz | 12 | Daughter | — | Iowa |
| 52 | Violet A. Gertz | 12 | Daughter | — | Iowa |
| 53 | Clarence A. Olson | 32 | Head | Farmer | Iowa |
| 54 | Pearl Olson | 30 | Wife | — | Iowa |
| 55 | Lois A. Olson | 4 | Daughter | — | Minnesota |
| 56 | Carl Olson | 78 | Father | — | Norway |
| 57 | Morris E. Foley | 26 | Hired hand | Farm Laborer | North Dakota |
| 58 | Oscar S. Olson THIS PERSON | 46 | Head | Farmer | Iowa |
| 59 | Mildred K. Olson | 27 | Wife | — | Iowa |
| 60 | Mavis E. Olson | 3 | Daughter | — | Minnesota |
| 61 | Esther L. Olson | 2 | Daughter | — | Minnesota |
| 62 | Russell M. Low | 22 | Hired hand | Farm Laborer | Minnesota |
| 63 | Elmer F. Spilde | 55 | Head | Farmer | Iowa |
| 64 | Anna M. Spilde | 47 | Wife | — | Iowa |
| 65 | Charlotte J. Spilde | 13 | Daughter | — | Iowa |
| 66 | Merlin J. Spilde | 24 | Son | Farm Laborer | Iowa |
| 67 | Helen L. Spilde | 23 | Daughter | — | Iowa |
| 68 | Shirley E. Spilde | 12 | In play | — | Minnesota |
| 69 | Adron C. Mowers | 47 | Head | Farmer | Iowa |
| 70 | Lillian G. Mowers | 41 | Wife | — | Indiana |
| 71 | Murray J. Mowers | 19 | Son | Farm Laborer | Iowa |
| 72 | Robert D. Mowers | 12 | Son | — | Iowa |
| 73 | Betty Jean Mowers | 12 | Daughter | — | Iowa |
| 74 | Clarence E. Foley | 43 | Head | Farmer | Iowa |
| 75 | Leona Foley | 34 | Wife | Telephone Operator | Iowa |
| 76 | Florence Wilde | 13 | Step daughter | — | Iowa |
| 77 | John W. Barker | 48 | Head | Farmer | Iowa |
| 78 | Emma A. Barker | 40 | Wife | — | Nebraska |
| 79 | Douglas D. Barker | 19 | Son | Farm Laborer | Nebraska |
| 80 | Lyle D. Barker | 18 | Son | Farm Laborer | Nebraska |
Pedigree Summary
Oscar
Gen 1 · 3 parents
~0.78
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)