AT
Alfred Thompson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Chickasaw-County, Iowa
Our Model Tree links this Alfred Thompson across the 1910, 1920, 1930 and 1940 US Censuses in Chickasaw-County, Iowa (XGBoost, ~Confirmed), with identified parents Ole & Ole — first a son (b.~1906), then head of a 6-person household.
Age 34
b. ~1906
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Chickasaw-County, Iowa |
| Surname | Thompson |
| Given Name | Alfred |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Chickasaw |
| Additional Details | |
| Occupation | Farmer |
| Industry | Own farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| Highest Grade | 8 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Utica Twp |
| Est. Birth Year | ~1906 |
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 Alfred | Age | Birth yr |
|---|---|---|---|---|
| Ervin Thompson | Son | — | 23 | ~1917 |
| Ole Thompson | Head | — | 68 | ~1872 |
| Alfred Thompson | Son | — | 34 | ~1906 |
| Lizzie Thompson | Spouse | — | 55 | ~1885 |
| Harold Thompson | Son | — | 21 | ~1919 |
| John Thompson | Son | — | 29 | ~1911 |
Census Appearances
1910
Chickasaw, Iowa
Son, age 3
Chickasaw, Iowa · implied b. ~1907 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Alfred |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Norway |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Chickasaw, Iowa
Son, age 14
Chickasaw, Iowa · implied b. ~1906 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Alfred T. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Norway |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Chickasaw, Iowa
Son, age 24
Chickasaw, Iowa · implied b. ~1906 — 50 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Alfred |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Norway |
| Class of Worker | VIVV |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Chickasaw-County, Iowa
Son, age 34
Chickasaw-County, Iowa · implied b. ~1906 — 6 household members
| Surname | Thompson |
| Given Name | Alfred |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 34 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Chickasaw |
| Occupation | Farmer |
| Industry | Own farm |
| Class of Worker | OA |
| Hours Worked | 40 |
| Income (1939) | 0 |
| Highest Grade | 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 Alfred Thompson across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Ole Thompson (~0.92 confidence) and father Ole Thompson (~0.92 confidence) and mother Annie Thompson (~0.92 confidence) and mother Lizzie Thompson (~0.92 confidence) and mother Mary Thompson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Ole Thompson
b. ~1872
Source father
● Household
· direct · ~0.92
Father
Ole Thompson
b. ~1872
Source father
● Household
· direct · ~0.92
Mother
Annie Thompson
b. ~1883
Source mother
● Household
· direct · ~0.92
Mother
Lizzie Thompson
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Mary Thompson
b. ~1882
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Alfred Thompson
Son · 1940 · age 34 · b. ~1906 · Iowa
★ You are viewing this record
Sibling
Harold Thompson
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Thompson
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ervin Thompson
Sibling · 1940 · age 23
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 — Chickasaw-County, Iowa
Open full size
1940 US Federal Census — Chickasaw-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01147-00983)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John P. Habelka | 44 | Head | Farmer | Iowa |
| 2 | Laura Habelka | 37 | Wife | Housewife | Iowa |
| 3 | Ivanelle Habelka | 15 | Daughter | House Work | Iowa |
| 4 | Julian Habelka | 13 | Son | — | Iowa |
| 5 | Mary Ann Habelka | 3 | Daughter | — | Iowa |
| 6 | John Habelka | 2 | Son | — | Iowa |
| 7 | Mary Louise Meeker | 78 | Mother-in-law | — | Germany |
| 8 | Ole T. Thompson | 68 | Head | Farmer | Wisconsin |
| 9 | Lizzie Thompson | 55 | Wife | — | Norway |
| 10 | Alfred Thompson THIS PERSON | 34 | Son | Farmer | Iowa |
| 11 | John Thompson | 29 | Son | Farm Laborer | Iowa |
| 12 | Ervin Thompson | 23 | Son | Farm Laborer | Iowa |
| 13 | Harold Thompson | 21 | Son | New Worker | Iowa |
| 14 | Knut Kjervik | 60 | Head | Farmer | Norway |
| 15 | Bessie Kjervik | 57 | Wife | Housewife | Iowa |
| 16 | Edmund Kjervik | 29 | Son | Farm Laborer | Iowa |
| 17 | Gudrun Kjervik | 20 | Son | Farm Laborer | Iowa |
| 18 | Olga Kjervik | 18 | Daughter | House Work | Iowa |
| 19 | Elmer Kjervik | 16 | Son | Farm Laborer | Iowa |
| 20 | Louise Kjervik | 14 | Daughter | House Work | Iowa |
| 21 | Ervin Habelka | 25 | Head | Farmer | Iowa |
| 22 | Wilma Habelka | 19 | Wife | Housewife | Iowa |
| 23 | Martin V. Doyle | 40 | Head | Farmer | Iowa |
| 24 | Leanilla Doyle | 36 | Wife | Housewife | Iowa |
| 25 | Mary Lou Doyle | 12 | Daughter | — | Iowa |
| 26 | James Doyle | 8 | Son | — | Iowa |
| 27 | Patricia Doyle | 4 | Daughter | — | Iowa |
| 28 | Margaret Doyle | 2 | Daughter | — | Iowa |
| 29 | Dick Eugene Doyle | 0 | Son | — | Iowa |
| 30 | Thomas J. Hepton | 32 | Head | Farm Laborer | Iowa |
| 31 | Lucille Hepton | 23 | Wife | Housewife | Iowa |
| 32 | Owen Price | 61 | Uncle | Farm Laborer | Iowa |
| 33 | Joe Geileman | 43 | Head | Farmer | Iowa |
| 34 | Rose Geileman | 38 | Wife | Housewife | Iowa |
| 35 | Joeine Geileman | 17 | Daughter | House Work | Iowa |
| 36 | Herman Geileman | 14 | Son | Farm Laborer | Iowa |
| 37 | Veronica Geileman | 12 | Daughter | — | Iowa |
| 38 | Alfred Geileman | 9 | Son | — | Iowa |
| 39 | Eugene Geileman | 5 | Son | — | Iowa |
| 40 | Gilbert Geileman | 3 | Son | — | Iowa |
Related Census Records
Pedigree Summary
Alfred + 3 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)