ON
Oscar Nelson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marshall-County, Minnesota
Our Model Tree links this Oscar Nelson across the 1910, 1920, 1930 and 1940 US Censuses in Marshall-County, Minnesota (XGBoost, ~Confirmed), with identified parents Olof & Andrew — first a son (b.~1899), then head of a 5-person household.
Age 41
b. ~1899
Male
Son
Born: Minnesota
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Marshall-County, Minnesota |
| Surname | Nelson |
| Given Name | Oscar A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Harrington |
| 1935 Residence (County) | Marshall |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | O |
| Hours Worked | 40 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same house |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
| Occupation | Farmer |
| Township / Ward | Harrington |
| Est. Birth Year | ~1899 |
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 |
|---|---|---|---|---|
| Andrew Nelson | Head | — | 69 | ~1871 |
| Crystal Nelson | Other | — | 28 | ~1912 |
| Maxine Nelson | Other | — | 5 | ~1935 |
| Donald Nelson | Other | — | 2 | ~1938 |
| Oscar Nelson | Son | — | 41 | ~1899 |
Census Appearances
1910
Marshall, Minnesota
Son, age 11
Marshall, Minnesota · implied b. ~1899 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | none |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1920
Marshall, Minnesota
Son, age 22
Marshall, Minnesota · implied b. ~1898 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Laborer |
| Industry | Home farm |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | Swedish |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1930
Marshall, Minnesota
Son, age 32
Marshall, Minnesota · implied b. ~1898 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Minnesota |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Norway |
| Occupation | Laborer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
1940
Marshall-County, Minnesota
Son, age 41
Marshall-County, Minnesota · implied b. ~1899 — 5 household members
| Surname | Nelson |
| Given Name | Oscar A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Single |
| Birthplace | Minnesota |
| 1935 Residence (City) | Harrington |
| 1935 Residence (County) | Marshall |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | O |
| Hours Worked | 40 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same house |
| Birth State | Minnesota |
| Birth Country | United States |
| Birthplace (normalized) | minnesota |
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 Nelson across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Olof Nelson (~0.92 confidence) and father Andrew Nelson (~0.92 confidence) and father Andrew Nelson (~0.92 confidence) and father Arthur Nelson (~0.92 confidence) and mother Hilda Nelson (~0.92 confidence) and mother Mary Nelson (~0.92 confidence). The pedigree spans 1 generation with 6 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Olof Nelson
b. ~1858
Source father
● Household
· direct · ~0.92
Father
Andrew Nelson
b. ~1870
Source father
● Household
· direct · ~0.92
Father
Andrew Nelson
b. ~1871
Source father
● Household
· direct · ~0.92
Father
Arthur Nelson
b. ~1871
Source father
● Household
· direct · ~0.92
Mother
Hilda Nelson
b. ~1874
Source mother
● Household
· direct · ~0.92
Mother
Mary Nelson
b. ~1878
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Oscar Nelson
Son · 1940 · age 41 · b. ~1899 · Minnesota
★ 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 — Marshall-County, Minnesota
Open full size
1940 US Federal Census — Marshall-County, Minnesota
Page Contents
18 people indexed on this census page (nara:1940:m-t0627-01936-00843)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Margaret M. Meyer | 14 | Daughter | — | Minnesota |
| 42 | Betty M. Meyer | 9 | Daughter | — | Minnesota |
| 43 | Paul E. Meyer | 8 | Son | — | Minnesota |
| 44 | Herbert Kurtz | 55 | Hired man | Farm Laborer | Iowa |
| 45 | Conrad L. Swanson | 46 | Head | Farmer | Minnesota |
| 46 | Florence A. Swanson | 44 | Wife | — | Minnesota |
| 47 | Neil E. Dahlman | 15 | Nephew | — | Minnesota |
| 48 | Herbert C. Leslie | 27 | Head | Farmer | Minnesota |
| 49 | Delphy A. Leslie | 19 | Wife | — | Minnesota |
| 50 | Donald C. Leslie | 1 | Son | — | Minnesota |
| 51 | Andrew P. Nelson | 69 | Head | — | Sweden |
| 52 | Oscar A. Nelson THIS PERSON | 41 | Son | Farmer | Minnesota |
| 53 | Crystal R. Nelson | 28 | Daughter in law | — | North Dakota |
| 54 | Maxine D. Nelson | 5 | Granddaughter | — | Minnesota |
| 55 | Donald D. Nelson | 2 | Grandson | — | Minnesota |
| 56 | Edward A. Johnson | 49 | Head | Farmer | Minnesota |
| 57 | Hildur E. Johnson | 42 | Wife | — | Minnesota |
| 58 | Henry Joncas | 22 | Hired man | Farm Laborer | Minnesota |
Pedigree Summary
Oscar
Gen 1 · 6 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)