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Helen Nelson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Wapello-County, Iowa
Our Model Tree links this Helen Nelson across the 1920, 1930 and 1940 US Censuses in Wapello-County, Iowa (XGBoost, ~Confirmed), with identified parents Matilda & Matilda — first a daughter (b.~1908), then head of a 3-person household.
Age 32
b. ~1908
Female
Daughter
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Wapello-County, Iowa |
| Surname | Nelson |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Ottumwa City |
| 1935 Residence (County) | Wapello County |
| Additional Details | |
| Occupation | bookkeeper |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 210 |
| Highest Grade | H 4 |
| 1935 Residence | Same house |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Bookkeeper |
| Township / Ward | Ottumwa City |
| Est. Birth Year | ~1908 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Helen | Age | Birth yr |
|---|---|---|---|---|
| Helen Nelson | Daughter | — | 32 | ~1908 |
| Matilda Nelson | Head | — | 74 | ~1866 |
| Otto Nelson | Son | — | 36 | ~1904 |
Census Appearances
1920
Wapello, Iowa
Daughter, age 12
Wapello, Iowa · implied b. ~1908 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Wapello, Iowa
Daughter, age 22
Wapello, Iowa · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Nelson |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Sweden |
| Mother's Birthplace | Sweden |
| Occupation | Teller |
| Industry | Bank |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Wapello-County, Iowa
Daughter, age 32
Wapello-County, Iowa · implied b. ~1908 — 3 household members
| Surname | Nelson |
| Given Name | Helen |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Ottumwa City |
| 1935 Residence (County) | Wapello County |
| Occupation | bookkeeper |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 210 |
| Highest Grade | H 4 |
| 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 Helen Nelson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Matilda Nelson (~0.92 confidence) and mother Matilda Nelson (~0.92 confidence) and father Carl Nelson (~0.92 confidence) and father Carl Nelson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Matilda Nelson
b. ~1866
Source mother
● Household
· direct · ~0.92
Mother
Matilda Nelson
b. ~1867
Source mother
● Household
· direct · ~0.92
Father
Carl Nelson
b. ~1868
Source father
● Household
· direct · ~0.92
Father
Carl Nelson
b. ~1869
Source father
● Household
· direct · ~0.92
This person
Anchor record
Helen Nelson
Daughter · 1940 · age 32 · b. ~1908 · Iowa
★ You are viewing this record
Sibling
Otto Nelson
Sibling · 1940 · age 36
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 — Wapello-County, Iowa
Open full size
1940 US Federal Census — Wapello-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01209-00092)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Joan Shields | 5 | Daughter | — | Iowa |
| 42 | Roger Shields | 4 | Son | — | Iowa |
| 43 | Walter H. Hays | 30 | Head | Gov'T Inspector | D.C. |
| 44 | Jennie Hays | 33 | Wife | — | Minnesota |
| 45 | Doris Maxine Hays | 7 | Daughter | — | Iowa |
| 46 | Carol Jean Hays | 5 | Daughter | — | Iowa |
| 47 | Lawrence Nelson | 25 | Head | Medical Doctor | New York |
| 48 | Helen Nelson | 24 | Wife | — | New York |
| 49 | Patricia Nelson | 1 | Daughter | — | Iowa |
| 50 | William Thompson | 52 | Head | Carpenter | Iowa |
| 51 | Ida Thompson | 47 | Wife | — | Iowa |
| 52 | Elmer Thompson | 19 | Son | Carpenter | Iowa |
| 53 | Lorina Thompson | 18 | Daughter | Sewing | Iowa |
| 54 | Bernice Thompson | 17 | Daughter | — | Iowa |
| 55 | Leonard Thompson | 15 | Son | Laborer | Iowa |
| 56 | Clementine Thompson | 14 | Daughter | — | Iowa |
| 57 | O. A. Clark | 45 | Head | Owner | Iowa |
| 58 | Eunice Clark | 45 | Wife | — | Iowa |
| 59 | Jack Clark | 24 | Son | — | Iowa |
| 60 | Kay Clark | 20 | Daughter | — | Iowa |
| 61 | Junior Clark | 15 | Son | — | Iowa |
| 62 | George Clark | 12 | Son | — | Iowa |
| 63 | Eva Angle | 69 | Maid | Housekeeper | Iowa |
| 64 | J. Game Kinney | 37 | Head | Dept. Manager | Iowa |
| 65 | Margaret Kinney | 37 | Wife | — | Illinois |
| 66 | William Kinney | 13 | Son | — | Iowa |
| 67 | Mary Clayton | 65 | Mother-in-law | — | Illinois |
| 68 | Edith Hughes | 20 | Maid | Maid | Illinois |
| 69 | Chauncy Collins | 49 | Head | — | Iowa |
| 70 | Ethel Collins | 45 | Wife | — | Iowa |
| 71 | Richard Collins | 17 | Son | — | Iowa |
| 72 | Scott Collins | 10 | Son | — | Iowa |
| 73 | Ruth Ann Collins | 3 | Daughter | — | Iowa |
| 74 | Thomas G. Yancey | 62 | Head | Owner | England |
| 75 | Elizabeth Yancey | 57 | Wife | — | Iowa |
| 76 | John Philip Yancey | 20 | Son | — | Iowa |
| 77 | Matilda Nelson | 74 | Head | — | Sweden |
| 78 | Otto Nelson | 36 | Son | Machinist | Iowa |
| 79 | Helen Nelson THIS PERSON | 32 | Daughter | Bookkeeper | Iowa |
| 80 | Hoodie Trumbold | 44 | Head | — | Missouri |
Pedigree Summary
Helen + 1 sibling
Gen 1 · 4 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)