HT
Harold Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Dubuque-County, Iowa
Our Model Tree links this Harold Thomas across the 1920, 1930 and 1940 US Censuses in Dubuque-County, Iowa (XGBoost, ~Confirmed), with identified parents Frank & Margaret — first a head (b.~1911), then head of a 3-person household.
Age 29
b. ~1911
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Dubuque-County, Iowa |
| Surname | Thomas |
| Given Name | Harold |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Dubuque |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 75 |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Farmer |
| Township / Ward | Washington Twp |
| Est. Birth Year | ~1911 |
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 Harold | Age | Birth yr |
|---|---|---|---|---|
| Ruth Thomas | Daughter | — | 1 | ~1939 |
| Harold Thomas | Head | — | 29 | ~1911 |
| Bernice Thomas | Spouse | — | 27 | ~1913 |
Census Appearances
1920
Dubuque, Iowa
Son, age 9
Dubuque, Iowa · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Dubuque, Iowa
Son, age 19
Dubuque, Iowa · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Laborer |
| Industry | General Farm |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Dubuque-County, Iowa
Head, age 29
Dubuque-County, Iowa · implied b. ~1911 — 3 household members
| Surname | Thomas |
| Given Name | Harold |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 29 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Dubuque |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | OA |
| Hours Worked | 75 |
| Income (1939) | 0 |
| Highest Grade | No 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 Harold Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Frank Thomas (~0.92 confidence) and mother Margaret Thomas (~0.92 confidence) and father Frank Thomas (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Frank Thomas
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Margaret Thomas
b. ~1884
Source mother
● Household
· direct · ~0.92
Father
Frank Thomas
b. ~1887
Source father
● Household
· direct · ~0.92
This person
Anchor record
Harold Thomas
Head · 1940 · age 29 · b. ~1911 · Iowa
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Dubuque-County, Iowa
Open full size
1940 US Federal Census — Dubuque-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01159-00729)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Daniel Sullivan | 70 | Head | Farmer | Iowa |
| 2 | Louis Sullivan | 74 | Head | — | Iowa |
| 3 | Catherine Sullivan | 68 | Wife | — | Iowa |
| 4 | Lester Pranga | 38 | Son | Farmer | Iowa |
| 5 | Ellen Pranga | 28 | Daughter-in-law | — | Iowa |
| 6 | Louis L. Pranga | 0 | Grandson | — | Iowa |
| 7 | W. B. Sullivan | 57 | Head | Farmer | Iowa |
| 8 | Mary E. Sullivan | 53 | Wife | — | Iowa |
| 9 | William Sullivan | 46 | Head | Farmer | Iowa |
| 10 | Mary A. Sullivan | 57 | Sister | — | Iowa |
| 11 | Michael Sullivan | 49 | Brother | Farmer | Iowa |
| 12 | Gregory Gansen | 45 | Head | Farmer | Iowa |
| 13 | Elizabeth Gansen | 46 | Wife | — | Iowa |
| 14 | Sophia Gansen | 15 | Daughter | — | Iowa |
| 15 | Susan Huss | 57 | Head | Farmer | Iowa |
| 16 | B. J. Huss | 37 | Son | Laborer | Iowa |
| 17 | Agnes Huss | 35 | Daughter | — | Iowa |
| 18 | Gene Reichel | 21 | Lodger | Laborer | Iowa |
| 19 | John J. Friederick | 38 | Head | Farmer | Iowa |
| 20 | Mary Friederick | 30 | Wife | — | Iowa |
| 21 | Ralph Friederick | 10 | Son | — | Iowa |
| 22 | Joseph Friederick | 8 | Son | — | Iowa |
| 23 | Earl Friederick | 5 | Son | — | Iowa |
| 24 | Esther Friederick | 3 | Daughter | — | Iowa |
| 25 | Donald Friederick | 1 | Son | — | Iowa |
| 26 | Kenneth Friederick | 0 | Son | — | Iowa |
| 27 | Emmett Mullen | 32 | Head | Farmer | Iowa |
| 28 | Raymond Mullen | 34 | Brother | Farmer | Iowa |
| 29 | Eliza Mullen | 68 | Mother | — | Iowa |
| 30 | John Joseph Koss | 27 | Head | Farmer | Iowa |
| 31 | Lauretta Koss | 25 | Wife | — | Iowa |
| 32 | Donald Koss | 3 | Son | — | Iowa |
| 33 | Richard Koss | 0 | Son | — | Iowa |
| 34 | Harold Thomas THIS PERSON | 29 | Head | Farmer | Iowa |
| 35 | Bernice Thomas | 27 | Wife | — | Iowa |
| 36 | Ruth Thomas | 1 | Daughter | — | Iowa |
| 37 | Howard Hanson | 47 | Head | Farmer | Iowa |
| 38 | Rosabel Hanson | 50 | Wife | — | Iowa |
| 39 | Leonard Hanson | 22 | Son | Laborer | Iowa |
| 40 | Evelyn Hanson | 20 | Daughter-in-law | — | Iowa |
Related Census Records
Pedigree Summary
Harold
Gen 1 · 3 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)