ON
Oscar Nelson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Marshall-County, Iowa
Our Model Tree links this Oscar Nelson across the 1920, 1930 and 1940 US Censuses in Marshall-County, Iowa (XGBoost, ~Confirmed), with identified parents Amel & W — first a son (b.~1911), then head of a 6-person household.
Age 29
b. ~1911
Male
Son
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Marshall-County, Iowa |
| Surname | Nelson |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Washington Twp |
| 1935 Residence (County) | Marshall |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 80 |
| Income (1939) | 600 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Washington Twp |
| Est. Birth Year | ~1911 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Oscar | Age | Birth yr |
|---|---|---|---|---|
| Axel Nelson | Head | — | 61 | ~1879 |
| Shirley Nelson | Other | — | 1 | ~1939 |
| Effie Nelson | Other | — | 21 | ~1919 |
| Lura Cook | Other | — | 55 | ~1885 |
| Oscar Nelson | Son | — | 29 | ~1911 |
| Mabel Nelson | Spouse | — | 56 | ~1884 |
Census Appearances
1920
Marshall, Iowa
Son, age 8
Marshall, Iowa · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Marshall, Iowa
Son, age 19
Marshall, Iowa · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Farm Laborer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Marshall-County, Iowa
Son, age 29
Marshall-County, Iowa · implied b. ~1911 — 6 household members
| Surname | Nelson |
| Given Name | Oscar |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Washington Twp |
| 1935 Residence (County) | Marshall |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 80 |
| Income (1939) | 600 |
| Highest Grade | 8 |
| 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 Nelson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Amel Nelson (~0.92 confidence) and father W Nelson (~0.92 confidence) and father Axel Nelson (~0.92 confidence) and mother Mabel Nelson (~0.92 confidence) and mother Mabel Nelson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Amel Nelson
b. ~1878
Source father
● Household
· direct · ~0.92
Father
W Nelson
b. ~1878
Source father
● Household
· direct · ~0.92
Father
Axel Nelson
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Mabel Nelson
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
Mabel Nelson
b. ~1887
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Oscar Nelson
Son · 1940 · age 29 · b. ~1911 · 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 — Marshall-County, Iowa
Open full size
1940 US Federal Census — Marshall-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01182-00999)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | D. J. Macdonald | 51 | Head | Electrician Contractor | Wyoming |
| 42 | Mary Macdonald | 50 | Wife | — | Iowa |
| 43 | Jeannette Macdonald | 21 | Daughter | Teacher | Iowa |
| 44 | Daniel Macdonald | 12 | Nephew | — | Iowa |
| 45 | Axel J. Nelson | 61 | Head | Farmer | Iowa |
| 46 | Mabel Nelson | 56 | Wife | — | Iowa |
| 47 | Oscar Nelson THIS PERSON | 29 | Son | Farmer | Iowa |
| 48 | Effie Nelson | 21 | Daughter-in-law | — | Iowa |
| 49 | Shirley Nelson | 1 | Granddaughter | — | Iowa |
| 50 | Lura Cook | 55 | Sister-in-law | — | Iowa |
| 51 | Isaac Eyre | 76 | Head | Farmer | N. Carolina |
| 52 | Leona Eyre | 58 | Wife | — | Iowa |
| 53 | Loren Eyre | 24 | Son | Hired Hand | Iowa |
| 54 | Virginia Eyre | 19 | Daughter-in-law | — | Missouri |
| 55 | Douglas Eyre | 2 | Grandson | — | Iowa |
| 56 | Henry Benson | 53 | Head | Hired Hand | Iowa |
| 57 | Blanche Benson | 50 | Wife | — | Iowa |
| 58 | Betty Benson | 10 | Daughter | — | Iowa |
| 59 | Herbert R. Benson | 50 | Head | Farmer | Iowa |
| 60 | Gata Benson | 49 | Wife | — | Iowa |
| 61 | Barbara Benson | 15 | Daughter | — | Iowa |
| 62 | Charles Benson | 14 | Son | — | Iowa |
| 63 | Clyde Benson | 13 | Son | — | Iowa |
| 64 | Loyal Benson | 12 | Son | — | Iowa |
| 65 | John O. Snyder | 51 | Head | Farmer | Illinois |
| 66 | Herman Snyder | 46 | Brother | Farmer | Illinois |
| 67 | Irene Snyder | 58 | Sister | — | Illinois |
| 68 | Joyce Snyder | 14 | Niece | — | Illinois |
| 69 | John Q. Sturtz | 41 | Head | Farmer | Ohio |
| 70 | Martha Sturtz | 41 | Wife | — | Iowa |
| 71 | Daniel Sturtz | 15 | Son | — | Iowa |
| 72 | Samuel W. Myers | 73 | Head | Farmer | Iowa |
| 73 | Bella Myers | 73 | Wife | — | Iowa |
| 74 | Floyd A. Myers | 35 | Son | — | Iowa |
| 75 | Elva Younker | 33 | Daughter | — | Iowa |
| 76 | Cliff O. Younker | 37 | Son-in-law | Farmer | Iowa |
| 77 | Eleanor Younker | 13 | Granddaughter | — | Iowa |
| 78 | Jackie Younker | 10 | Grandson | — | Iowa |
| 79 | Vickie Younker | 7 | Granddaughter | — | Iowa |
| 80 | Bill Younker | 7 | Grandson | — | Iowa |
Pedigree Summary
Oscar
Gen 1 · 5 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)