HT
Harold Thompson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this Harold Thompson across the 1910, 1920, 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed), with identified parents Herbert & Herbert — first a son (b.~1908), then head of a 4-person household.
Age 32
b. ~1908
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Thompson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Webster Twp |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Occupation | Farm helper |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 866 |
| Highest Grade | C 1 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farm Helper |
| Township / Ward | Webster Twp |
| 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harold | Age | Birth yr |
|---|---|---|---|---|
| Herbert Thompson | Head | — | 65 | ~1875 |
| Harold Thompson | Son | — | 32 | ~1908 |
| Floyd Thompson | Son | — | 25 | ~1915 |
| Alta Thompson | Spouse | — | 59 | ~1881 |
Census Appearances
1910
Polk, Iowa
Son, age 2
Polk, Iowa · implied b. ~1908 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Harold H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Polk, Iowa
Son, age 12
Polk, Iowa · implied b. ~1908 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Harold H |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Polk, Iowa
Son, age 22
Polk, Iowa · implied b. ~1908 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thompson |
| Given Name | Harold L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Iowa |
| Occupation | Laborer |
| Industry | General farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Son, age 32
Polk-County, Iowa · implied b. ~1908 — 4 household members
| Surname | Thompson |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Webster Twp |
| 1935 Residence (County) | Polk |
| Occupation | Farm helper |
| Industry | Farm |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 866 |
| Highest Grade | C 1 |
| 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 Harold Thompson across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Herbert Thompson (~0.92 confidence) and father Herbert Thompson (~0.92 confidence) and father Herbert Thompson (~0.92 confidence) and mother Alta Thompson (~0.92 confidence) and mother Alta Thompson (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Herbert Thompson
b. ~1874
Source father
● Household
· direct · ~0.92
Father
Herbert Thompson
b. ~1875
Source father
● Household
· direct · ~0.92
Father
Herbert Thompson
b. ~1875
Source father
● Household
· direct · ~0.92
Mother
Alta Thompson
b. ~1880
Source mother
● Household
· direct · ~0.92
Mother
Alta Thompson
b. ~1881
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Thompson
Son · 1940 · age 32 · b. ~1908 · Iowa
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Sibling
Floyd Thompson
Sibling · 1940 · age 25
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 — Polk-County, Iowa
Open full size
1940 US Federal Census — Polk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01192-01066)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Gladys Kaefer | 31 | Daughter | Housewife | Iowa |
| 42 | Herbert Thompson | 65 | Head | Farmer | Wisconsin |
| 43 | Alta Thompson | 59 | Wife | Housewife | Iowa |
| 44 | Harold Thompson THIS PERSON | 32 | Son | Farm Helper | Iowa |
| 45 | Floyd Thompson | 25 | Son | Farmer | Iowa |
| 46 | John J. Denney | 79 | Head | — | Iowa |
| 47 | Myrtle Denney | 49 | Daughter | Private Teacher | Iowa |
| 48 | Elbie Clements | 71 | Head | Farmer | Iowa |
| 49 | Anna Clements | 67 | Wife | Housewife | Iowa |
| 50 | Melvin Gourd | 25 | Son | Mechanic | Iowa |
| 51 | Carrie Gourd | 27 | Daughter | Housewife | Iowa |
| 52 | Orville Gourd | 24 | Son-in-law | Body Fender | Iowa |
| 53 | Homer Danley | 25 | Head | Truck Driver | Iowa |
| 54 | Evelyn Danley | 34 | Wife | Housewife | Iowa |
| 55 | Merlyn Danley | 3 | Son | — | Iowa |
| 56 | Carolyn Danley | 5 | Daughter | — | Iowa |
| 57 | Carl Ashley | 18 | Nephew | — | Iowa |
| 58 | D. B. Erickson | 57 | Head | Farmer | Iowa |
| 59 | Martha Erickson | 59 | Wife | Housewife | Minnesota |
| 60 | Alma Witmer | 31 | Daughter | Housewife | Iowa |
| 61 | Delores Witmer | 10 | Grand-daughter | — | Iowa |
| 62 | Dee Conway | 44 | Hired | Farm Hand | Iowa |
| 63 | Fred J. Wilson | 52 | Head | Farmer | Iowa |
| 64 | Minnie Wilson | 52 | Wife | Housewife | Iowa |
| 65 | Theodosia Allen | 54 | Sister-in-law | Housewife | Iowa |
| 66 | Geo. A. Findley | 63 | Head | Farmer | Iowa |
| 67 | Maybelle Findley | 62 | Wife | Housewife | Iowa |
| 68 | Virginia Findley | 30 | Daughter | New Worker | Iowa |
| 69 | Craig W. Findley | 24 | Son | Farmer | Iowa |
| 70 | Howard Siebert | 24 | Head | Laborer | Iowa |
| 71 | Helene Siebert | 26 | Wife | Clerk | Iowa |
| 72 | Chas. W. Campbell | 69 | Head | Farmer | Iowa |
| 73 | Martha E. Campbell | 68 | Wife | Housewife | Tenn. |
| 74 | Blanche Mcwilliams | 69 | Sister-in-law | Retired | Pennsylvania |
| 75 | Charles F. Siebert | 54 | Head | Farmer | Iowa |
| 76 | Lena M. Siebert | 43 | Wife | Housewife | So Dakota |
| 77 | Fred Hansen | 19 | Step-son | — | Iowa |
| 78 | Cecil Fox | 47 | Head | Farmer | Iowa |
| 79 | Mary F. Fox | 48 | Wife | Housewife | Iowa |
| 80 | Doris Fox | 16 | Daughter | — | Iowa |
Related Census Records
Pedigree Summary
Harold + 1 sibling
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)