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Nels Nelson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Shelby-County, Iowa
Our Model Tree links this Nels Nelson across the 1920, 1930 and 1940 US Censuses in Shelby-County, Iowa (XGBoost, ~Confirmed), with identified parents Marie & Andrew — first a head (b.~1896), then head of a 4-person household.
Age 44
b. ~1896
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Shelby-County, Iowa |
| Surname | Nelson |
| Given Name | Nels C D |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Jackson Township |
| 1935 Residence (County) | Shelby |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Jackson Township |
| Est. Birth Year | ~1896 |
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 Nels | Age | Birth yr |
|---|---|---|---|---|
| Valerie Nelson | Daughter | — | 11 | ~1929 |
| Helen Nelson | Daughter | — | 15 | ~1925 |
| Nels Nelson | Head | — | 44 | ~1896 |
| Dora Nelson | Spouse | — | 46 | ~1894 |
Census Appearances
1920
Shelby, Iowa
Son, age 24
Shelby, Iowa · implied b. ~1896 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Neilsen |
| Given Name | Nels Christian |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | Truck Farm |
| Class of Worker | O.A. |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Shelby, Iowa
Head, age 34
Shelby, Iowa · implied b. ~1896 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nielson |
| Given Name | Nels C |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 24 |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | VVV |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Radio Set | R |
| Veteran | Yes WW |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Shelby-County, Iowa
Head, age 44
Shelby-County, Iowa · implied b. ~1896 — 4 household members
| Surname | Nelson |
| Given Name | Nels C D |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Jackson Township |
| 1935 Residence (County) | Shelby |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 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 Nels Nelson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Marie Neilsen (~0.92 confidence) and father Andrew Neilsen (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Marie Neilsen
b. ~1864
Source mother
● Household
· direct · ~0.92
Father
Andrew Neilsen
b. ~1869
Source father
● Household
· direct · ~0.92
This person
Anchor record
Nels Nelson
Head · 1940 · age 44 · b. ~1896 · 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 — Shelby-County, Iowa
Open full size
1940 US Federal Census — Shelby-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01204-00297)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Carl O Jacobsen | 36 | Head | Farmer | Iowa |
| 42 | Anita Jacobsen | 32 | Wife | — | Iowa |
| 43 | Elaine Jacobsen | 10 | Daughter | — | Iowa |
| 44 | Glenn Jacobsen | 8 | Son | — | Iowa |
| 45 | Lois Jacobsen | 7 | Daughter | — | Iowa |
| 46 | James G B Rasmussen | 56 | Head | Farmer | Iowa |
| 47 | Jayne Jensen | 52 | House Keeper | Housekeeper | Denmark |
| 48 | Grover Jensen | 24 | Her son | Farm Labor | Iowa |
| 49 | Lloyd Jensen | 18 | Her son | Farm Labor | Iowa |
| 50 | Chris M D Petersen | 53 | Head | Farmer | Denmark |
| 51 | Nelda Petersen | 21 | Daughter | Teacher | Iowa |
| 52 | Berlin Petersen | 19 | Daughter | Teacher | Iowa |
| 53 | Roland Petersen | 17 | Son | Farm Labor | Iowa |
| 54 | George H Barrett | 58 | Head | Road Patrol | Iowa |
| 55 | Bertha A Barrett | 53 | Wife | — | Iowa |
| 56 | Henry S Hendricksen | 56 | Head | Farmer | Iowa |
| 57 | Marie Hendricksen | 44 | Wife | — | Iowa |
| 58 | Alfred Christensen | 24 | Head | Farm Labor | Iowa |
| 59 | June E Christensen | 23 | Wife | — | Iowa |
| 60 | Jerry Leroy Christensen | 2 | Son | — | Iowa |
| 61 | Erhardt Robt Nielsen | 30 | Head | Domestic | Wisconsin |
| 62 | Julia Nielsen | 32 | Sister | — | Wisconsin |
| 63 | Anne Nielsen | 68 | Mother | — | Denmark |
| 64 | Nels C D Nelson THIS PERSON | 44 | Head | Farmer | Iowa |
| 65 | Dora Nelson | 46 | Wife | — | Iowa |
| 66 | Helen Nelson | 15 | Daughter | — | Iowa |
| 67 | Valerie Nelson | 11 | Daughter | — | Iowa |
| 68 | B E Rasmussen | 60 | Head | Farmer | Iowa |
| 69 | Laura Rasmussen | 44 | Wife | — | Kansas |
| 70 | Kenneth Rasmussen | 7 | Son | — | Kansas |
| 71 | Keith Rasmussen | 3 | Son | — | Kansas |
| 72 | Mary Ann Rasmussen | 3 | Daughter | — | Kansas |
| 73 | Mary Ann Rasmussen | 1 | Daughter | — | Kansas |
| 74 | Sara E Truer | 73 | Mother in law | — | Missouri |
| 75 | Geo H D Campbell | 48 | Head | Farmer | Iowa |
| 76 | Ida Campbell | 43 | Wife | — | Iowa |
| 77 | Keith Campbell | 15 | Son | Farm Labor | Iowa |
| 78 | Sheldon Campbell | 14 | Son | — | Iowa |
| 79 | Russell Campbell | 10 | Son | — | Iowa |
| 80 | Deloris Campbell | 6 | Daughter | — | Iowa |
Pedigree Summary
Nels
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)