OS
Oscar Swanson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Union-County, South Dakota
Our Model Tree links this Oscar Swanson across the 1920, 1930 and 1940 US Censuses in Union-County, South Dakota (XGBoost, ~Confirmed), with identified parents Swan & Belinda — first a head (b.~1893), then head of a 4-person household.
Age 47
b. ~1893
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Union-County, South Dakota |
| Surname | Swanson |
| Given Name | Oscar |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Virginia Township |
| 1935 Residence (County) | Union |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 65 |
| Income (1939) | 0 |
| Highest Grade | 7 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Virginia Township |
| Est. Birth Year | ~1893 |
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 |
|---|---|---|---|---|
| Melvin Swanson | Son | — | 18 | ~1922 |
| Kenneth Swanson | Son | — | 15 | ~1925 |
| Oscar Swanson | Head | — | 47 | ~1893 |
| Mamie Swanson | Spouse | — | 44 | ~1896 |
Census Appearances
1920
Union, South …
Son, age 27
Union, South Dakota · implied b. ~1893 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Swanson |
| Given Name | Oscar S |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Married |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Helper |
| Industry | on farm |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Union, South …
Head, age 37
Union, South Dakota · implied b. ~1893 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Swanson |
| Given Name | Oscar |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 27 |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Farmer |
| Industry | General farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Union-County, South …
Head, age 47
Union-County, South Dakota · implied b. ~1893 — 4 household members
| Surname | Swanson |
| Given Name | Oscar |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Virginia Township |
| 1935 Residence (County) | Union |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 65 |
| Income (1939) | 0 |
| Highest Grade | 7 |
| 1935 Residence | Same place |
| 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 Swanson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Swan Swanson (~0.92 confidence) and mother Belinda Swanson (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Swan Swanson
b. ~1864
Source father
● Household
· direct · ~0.92
Mother
Belinda Swanson
b. ~1868
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Oscar Swanson
Head · 1940 · age 47 · b. ~1893 · 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 — Union-County, South Dakota
Open full size
1940 US Federal Census — Union-County, South Dakota
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03869-00339)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lawrence Dagle | 43 | Head | Farmer | Iowa |
| 2 | Ethel Dagle | 40 | Wife | — | Iowa |
| 3 | Chester Dagle | 20 | Son | Labour | Iowa |
| 4 | Walter Dagle | 16 | Son | — | Iowa |
| 5 | Donald Dagle | 12 | Son | — | Iowa |
| 6 | Guy Hodgson | 46 | Head | Farmer | Iowa |
| 7 | Mabel Hodgson | 45 | Wife | — | South Dakota |
| 8 | Edward Hodgson | 21 | Son | Labour | Iowa |
| 9 | Glenn Hodgson | 19 | Son | Labour | Iowa |
| 10 | Oscar Swanson THIS PERSON | 47 | Head | Farmer | Iowa |
| 11 | Mamie Swanson | 44 | Wife | — | South Dakota |
| 12 | Melvin Swanson | 18 | Son | — | South Dakota |
| 13 | Kenneth Swanson | 15 | Son | — | South Dakota |
| 14 | Dick Jager | 46 | Head | Farmer | Iowa |
| 15 | Emma Jager | 37 | Wife | — | Kansas |
| 16 | Jessie Jager | 19 | Daughter | — | Iowa |
| 17 | Richard Jager | 15 | Son | — | Iowa |
| 18 | Hilda Jager | 7 | Daughter | — | Iowa |
| 19 | Loretta Jager | 2 | Daughter | — | Iowa |
| 20 | Helen Bruget | 47 | Head | — | Colorado |
| 21 | Ralph Bruget | 24 | Son | Farmer | South Dakota |
| 22 | Norman Bruget | 22 | Son | Farmer | South Dakota |
| 23 | Helen Bruget | 17 | Daughter | — | South Dakota |
| 24 | Donald Bruget | 13 | Son | — | South Dakota |
| 25 | Ralph Richardson | 30 | Head | Farmer | Missouri |
| 26 | Florence Richardson | 24 | Wife | — | Iowa |
| 27 | Roy Richardson | 6 | Son | — | Iowa |
| 28 | O. H. French | 45 | Head | Farmer | Norway |
| 29 | Charlotte French | 37 | Wife | — | South Dakota |
| 30 | Harvey French | 13 | Son | — | South Dakota |
| 31 | Clifford French | 11 | Son | — | South Dakota |
| 32 | Idis French | 10 | Daughter | — | South Dakota |
| 33 | Robert French | 8 | Son | — | South Dakota |
| 34 | Infant French | 0 | Daughter | — | South Dakota |
| 35 | Wm. H. Miller | 54 | Head | Farmer | South Dakota |
| 36 | Margaret Miller | 53 | Wife | — | Iowa |
| 37 | Bruce Miller | 22 | Son | Labour | South Dakota |
| 38 | Neil Miller | 14 | Son | — | Iowa |
| 39 | Robert Miller | 30 | Head | Farmer | South Dakota |
| 40 | Julia Miller | 30 | Wife | — | 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)