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Harold Nelson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Pottawattamie-County, Iowa
Our Model Tree links this Harold Nelson across the 1920, 1930 and 1940 US Censuses in Pottawattamie-County, Iowa (XGBoost, ~Confirmed), with identified parents Christina & Christina — first a son (b.~1910), then head of a 5-person household.
Age 30
b. ~1910
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Pottawattamie-County, Iowa |
| Surname | Nelson |
| Given Name | Harold L. B. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Boomer Twp |
| 1935 Residence (County) | Pottawattamie |
| Additional Details | |
| Occupation | Farmer |
| Industry | on Farm |
| Class of Worker | NP |
| Hours Worked | 60 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Boomer Twp |
| Est. Birth Year | ~1910 |
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 Harold | Age | Birth yr |
|---|---|---|---|---|
| Helene Nelson | Daughter | — | 29 | ~1911 |
| N Nelson | Head | — | 63 | ~1877 |
| Everett Nelson | Son | — | 27 | ~1913 |
| Harold Nelson | Son | — | 30 | ~1910 |
| Christina Nelson | Spouse | — | 65 | ~1875 |
Census Appearances
1920
Pottawattamie, Iowa
Son, age 10
Pottawattamie, Iowa · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Denmark |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Pottawattamie, Iowa
Son, age 20
Pottawattamie, Iowa · implied b. ~1910 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Denmark |
| Mother's Birthplace | Iowa |
| Occupation | Farm laborer |
| Industry | Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Pottawattamie-County, Iowa
Son, age 30
Pottawattamie-County, Iowa · implied b. ~1910 — 5 household members
| Surname | Nelson |
| Given Name | Harold L. B. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Boomer Twp |
| 1935 Residence (County) | Pottawattamie |
| Occupation | Farmer |
| Industry | on Farm |
| Class of Worker | NP |
| Hours Worked | 60 |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| 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 Harold Nelson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Christina Nelson (~0.92 confidence) and mother Christina Nelson (~0.92 confidence) and father N Nelson (~0.92 confidence) and father Nels Nelson (~0.92 confidence) and father Nels Nelson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Christina Nelson
b. ~1875
Source mother
● Household
· direct · ~0.92
Mother
Christina Nelson
b. ~1875
Source mother
● Household
· direct · ~0.92
Father
N Nelson
b. ~1877
Source father
● Household
· direct · ~0.92
Father
Nels Nelson
b. ~1877
Source father
● Household
· direct · ~0.92
Father
Nels Nelson
b. ~1877
Source father
● Household
· direct · ~0.92
This person
Anchor record
Harold Nelson
Son · 1940 · age 30 · b. ~1910 · Iowa
★ You are viewing this record
Sibling
Helene Nelson
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Everett Nelson
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Pottawattamie-County, Iowa
Open full size
1940 US Federal Census — Pottawattamie-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01198-00054)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Lena S. Kuyendall | 64 | Wife | — | Germany |
| 42 | Donald Anderson | 28 | Head | Farmer | Iowa |
| 43 | Ruth Anderson | 27 | Wife | — | Iowa |
| 44 | Jane Ann Anderson | 3 | Daughter | — | Iowa |
| 45 | Jay Donald Anderson | 1 | Son | — | Iowa |
| 46 | Peter Olsen | 50 | Hired Hand | Farm Laborer | Iowa |
| 47 | Nellie M. Smith | 38 | Head | Farmer | Iowa |
| 48 | Glenn H. Smith | 12 | Son | — | Iowa |
| 49 | Harvey L. Smith | 9 | Son | — | Iowa |
| 50 | Lankford Fox | 31 | Head | Farmer | Iowa |
| 51 | Viola Fox | 30 | Wife | — | Iowa |
| 52 | Pauline Fox | 12 | Daughter | — | Iowa |
| 53 | Ruth Fox | 11 | Daughter | — | Iowa |
| 54 | Homer T. Smith | 42 | Head | Farmer | Iowa |
| 55 | Evelyn M. Smith | 36 | Wife | — | Iowa |
| 56 | Marjorie L. Smith | 11 | Daughter | — | Iowa |
| 57 | N. J. Nelson | 63 | Head | Farmer | Denmark |
| 58 | Christina Nelson | 65 | Wife | — | Iowa |
| 59 | Harold L. B. Nelson THIS PERSON | 30 | Son | Farmer | Iowa |
| 60 | Everett K. B. Nelson | 27 | Son | Farmer | Iowa |
| 61 | Helene A. B. Nelson | 29 | Daughter | Work In Shop | Iowa |
| 62 | Marion Rasmussen | 54 | Head | Farmer | Iowa |
| 63 | Marie E. Rasmussen | 38 | Wife | — | Denmark |
| 64 | Marion Jr. Rasmussen | 15 | Son | — | Iowa |
| 65 | Ethen H. Rasmussen | 11 | Son | — | Iowa |
| 66 | Bennett G. Rasmussen | 9 | Son | — | Iowa |
| 67 | Roland R. Rasmussen | 7 | Son | — | Iowa |
| 68 | Quentin J. Rasmussen | 4 | Son | — | Iowa |
| 69 | Roseanna M. Rasmussen | 2 | Daughter | — | Iowa |
| 70 | Edwin L. Peterson | 34 | Head | Minister | Ill |
| 71 | Ruth Peterson | 41 | Wife | — | Ill |
| 72 | Rhoda D. Peterson | 6 | Daughter | — | Ill |
| 73 | James E. Peterson | 4 | Son | — | Ill |
| 74 | John C. Peterson | 4 | Son | — | Ill |
| 75 | Mark H. Peterson | 3 | Son | — | Iowa |
| 76 | David Mockland | 42 | Head | Farmer | Iowa |
| 77 | Catherine Kelley | 17 | Lodger | — | Iowa |
| 78 | Ralph E. Spencer | 54 | Head | Farmer | Iowa |
| 79 | Hannah Spencer | 53 | Wife | — | Iowa |
| 80 | Fern Lila | 23 | Daughter | School Teacher | Iowa |
Pedigree Summary
Harold + 2 siblings
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)