RN
Robert Nelson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Sac-County, Iowa
Our Model Tree links this Robert Nelson across the 1920, 1930 and 1940 US Censuses in Sac-County, Iowa (XGBoost, ~Confirmed), with identified parents Lula & Oliver — first a head (b.~1911), then head of a 4-person household.
Age 29
b. ~1911
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Sac-County, Iowa |
| Surname | Nelson |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| Additional Details | |
| Occupation | Mechanical Engineer |
| Industry | Road Construction |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 800 |
| Highest Grade | H-4 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Mechanical Engineer |
| Township / Ward | Lake View |
| 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Robert | Age | Birth yr |
|---|---|---|---|---|
| Judith Nelson | Daughter | — | 6 | ~1934 |
| Robert Nelson | Head | — | 29 | ~1911 |
| Robert Nelson | Son | — | 9 | ~1931 |
| Bernice Nelson | Spouse | — | 30 | ~1910 |
Census Appearances
1920
Sac, Iowa
Son, age 9
Sac, Iowa · implied b. ~1911 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Sac, Iowa
Son, age 19
Sac, Iowa · implied b. ~1911 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Robert |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Iowa |
| Occupation | Laborer |
| Industry | Road |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Sac-County, Iowa
Head, age 29
Sac-County, Iowa · implied b. ~1911 — 4 household members
| Surname | Nelson |
| Given Name | Robert |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| Occupation | Mechanical Engineer |
| Industry | Road Construction |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 800 |
| Highest Grade | H-4 |
| 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 Robert Nelson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Lula Nelson (~0.92 confidence) and father Oliver Nelson (~0.92 confidence) and father Charles Nelson (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Lula Nelson
b. ~1882
Source mother
● Household
· direct · ~0.92
Father
Oliver Nelson
b. ~1886
Source father
● Household
· direct · ~0.92
Father
Charles Nelson
b. ~1890
Source father
● Household
· direct · ~0.92
This person
Anchor record
Robert Nelson
Head · 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 — Sac-County, Iowa
Open full size
1940 US Federal Census — Sac-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01201-00849)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Thomas Brauer | 37 | Head | Trucker | Iowa |
| 42 | Erma Brauer | 33 | Wife | — | Wisconsin |
| 43 | Betty Brauer | 11 | Daughter | — | Iowa |
| 44 | Cecile Brauer | 8 | Daughter | — | Iowa |
| 45 | Robert Nelson THIS PERSON | 29 | Head | Mechanical Engineer | Iowa |
| 46 | Bernice Nelson | 30 | Wife | — | Iowa |
| 47 | Robert Nelson | 9 | Son | — | Iowa |
| 48 | Judith Nelson | 6 | Daughter | — | Iowa |
| 49 | James D. Deal | 53 | Head | Installation Man | Iowa |
| 50 | Ethel Q. Deal | 49 | Wife | — | Iowa |
| 51 | Charles Deal | 16 | Son | — | Iowa |
| 52 | Harold Bradley | 31 | Head | Assistant Manager | Iowa |
| 53 | Lenore Bradley | 29 | Wife | — | Iowa |
| 54 | Alice S. Groom | 65 | Head | — | Illinois |
| 55 | Emmeline Davidson | 63 | Sister | — | Illinois |
| 56 | Harry Rodman | 68 | Head | — | Illinois |
| 57 | Eva Rodman | 64 | Wife | Nursing | Illinois |
| 58 | Emma E. Roberts | 68 | Lodger | — | Illinois |
| 59 | Elvy Masteller | 44 | Head | Farmer | Iowa |
| 60 | Hazel Masteller | 42 | Wife | Proprietor | Illinois |
| 61 | Verlyn Masteller | 22 | Son | Mechanic | South Dakota |
| 62 | Esther Masteller | 18 | Daughter | — | Iowa |
| 63 | Lois Masteller | 16 | Daughter | — | Iowa |
| 64 | Wanda Masteller | 13 | Daughter | — | Iowa |
| 65 | Evelyn Lister | 19 | Lodger | Waitress | Iowa |
| 66 | Mervin Fuller | 29 | Head | Dentist | Nebraska |
| 67 | Neina Fuller | 23 | Wife | — | Iowa |
| 68 | Doris Sue Fuller | 0 | Daughter | — | Iowa |
| 69 | Clair Iverson | 37 | Head | Teacher | Iowa |
| 70 | Martha Iverson | 28 | Wife | — | North Dakota |
| 71 | John Alan Iverson | 2 | Son | — | Iowa |
| 72 | Nancy Coleman | 39 | Head | Laundress | Illinois |
| 73 | Alice Coleman | 18 | Daughter | — | Iowa |
| 74 | Sylvester Coleman | 12 | Son | — | Iowa |
| 75 | Donna Mae Coleman | 10 | Daughter | — | Iowa |
| 76 | Donald Dan Coleman | 10 | Son | — | Iowa |
| 77 | Charlotte Coleman | 4 | Daughter | — | Iowa |
| 78 | Oscar Nord | 31 | Head | Mechanic | Minnesota |
| 79 | Myrtle Nord | 24 | Wife | — | Minnesota |
| 80 | <End> | None | — | — | — |
Pedigree Summary
Robert
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)