DT
Donald Thompson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Clay-County, Iowa
Our Model Tree links this Donald Thompson across the 1920, 1930 and 1940 US Censuses in Clay-County, Iowa (XGBoost, ~Confirmed), with identified parents Wilbur & Willis — first a son (b.~1915), then head of a 4-person household.
Age 25
b. ~1915
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Clay-County, Iowa |
| Surname | Thompson |
| Given Name | Donald |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Spencer |
| Additional Details | |
| Occupation | Laborer |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 988 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Laborer |
| Township / Ward | Spencer |
| Est. Birth Year | ~1915 |
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 Donald | Age | Birth yr |
|---|---|---|---|---|
| Dorothy Thompson | Spouse | — | 49 | ~1891 |
| Willis Thompson | Head | — | 52 | ~1888 |
| Donald Thompson | Son | — | 25 | ~1915 |
| Ernest Thompson | Son | — | 20 | ~1920 |
Census Appearances
1920
Clay, Iowa
Son, age 5
Clay, Iowa · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Donald W |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | South Dakota |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Clay, Iowa
Son, age 15
Clay, Iowa · implied b. ~1915 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Donald W. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | S. Dakota |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Clay-County, Iowa
Son, age 25
Clay-County, Iowa · implied b. ~1915 — 4 household members
| Surname | Thompson |
| Given Name | Donald |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Spencer |
| Occupation | Laborer |
| Class of Worker | PW |
| Hours Worked | 36 |
| Income (1939) | 988 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| 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 Donald Thompson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Wilbur Thompson (~0.92 confidence) and father Willis Thompson (~0.92 confidence) and mother Dorothy Thompson (~0.92 confidence) and mother Dorothy Thompson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Wilbur Thompson
b. ~1888
Source father
● Household
· direct · ~0.92
Father
Willis Thompson
b. ~1888
Source father
● Household
· direct · ~0.92
Mother
Dorothy Thompson
b. ~1891
Source mother
● Household
· direct · ~0.92
Mother
Dorothy Thompson
b. ~1891
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Donald Thompson
Son · 1940 · age 25 · b. ~1915 · Iowa
★ You are viewing this record
Sibling
Ernest Thompson
Sibling · 1940 · age 20
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 — Clay-County, Iowa
Open full size
1940 US Federal Census — Clay-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01148-00705)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Conray Dunning | 13 | Son | — | Iowa |
| 42 | Alden Dunning | 8 | Son | — | Minnesota |
| 43 | Willis Thompson | 52 | Head | Laborer | Iowa |
| 44 | Dorothy Thompson | 49 | Wife | Worker At Swift | S. Dakota |
| 45 | Donald Thompson THIS PERSON | 25 | Son | Laborer | Iowa |
| 46 | Ernest Thompson | 20 | Son | Laborer | Iowa |
| 47 | Lewis Larsen | 57 | Head | Salesman | Iowa |
| 48 | Ella Larsen | 47 | Wife | — | Iowa |
| 49 | Ethel Larsen | 17 | Daughter | — | — |
| 50 | Elmer Amick | 65 | Head | Odd Jobs | Indiana |
| 51 | Anna Amick | 57 | Wife | — | Illinois |
| 52 | Cora Wilsey | 57 | Head | Manager Of Village Apt | Minnesota |
| 53 | Stella Lighten | 53 | Roomer | Sales Lady | Iowa |
| 54 | Myrtle Smith | 40 | Head | Teacher In High School | Iowa |
| 55 | James Smith | 14 | Son | — | Iowa |
| 56 | Clement Denges | 36 | Head | Salesman | Iowa |
| 57 | Rita Denges | 32 | Wife | — | Washington |
| 58 | Patricia Ann Denges | 7 | Daughter | — | Iowa |
| 59 | John Maus | 25 | Head | Salesman | Iowa |
| 60 | Evelyn Maus | 23 | Wife | — | Illinois |
| 61 | Arthur Mccacance | 44 | Head | Salesman | Ill. |
| 62 | Maude Mccacance | 50 | Wife | — | Ill. |
| 63 | Shirley Mccacance | 21 | Daughter | — | Ill. |
| 64 | Betty Mccacance | 18 | Daughter | — | Ill. |
| 65 | Robert Sampler | 25 | Head | Electrician | Iowa |
| 66 | Eva Sampler | 23 | Wife | Odd Jobs With Taxi | Iowa |
| 67 | Floyd Fuller | 47 | Head | — | Iowa |
| 68 | Leona Fuller | 42 | Wife | — | Iowa |
| 69 | Louis Fuller | 24 | Son | New Worker | Iowa |
| 70 | William Fuller | 17 | Son | — | Iowa |
| 71 | Alice Fuller | 15 | Son | — | Iowa |
| 72 | Doris Fuller | 6 | Daughter | — | Iowa |
| 73 | Myra Williams | 68 | Head | — | Iowa |
| 74 | William Becket | 63 | Head | Salesman | Iowa |
| 75 | Grace Becket | 61 | Wife | School Teacher | Missouri |
| 76 | William Castendyck | 83 | Head | — | Illinois |
| 77 | Hannah Castendyck | 70 | Sister | — | Illinois |
| 78 | F. J. O'Brien | 69 | Head | President Of Clay Co. Bank | Wisconsin |
| 79 | Nellie Merr | 66 | Sister | — | Iowa |
| 80 | Marion Merr | 32 | Nice | — | Iowa |
Pedigree Summary
Donald + 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)