HT
Harold Thomas — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Boone-County, Illinois
Our Model Tree links this Harold Thomas across the 1920, 1930 and 1940 US Censuses in Boone-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1896), then head of a 5-person household.
Age 44
b. ~1896
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Boone-County, Illinois |
| Surname | Thomas |
| Given Name | Harold E. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Belvidere |
| 1935 Residence (County) | Boone |
| Additional Details | |
| Occupation | Farmer |
| Industry | Farming |
| Class of Worker | OA |
| Hours Worked | 75 |
| Income (1939) | 1200 |
| Highest Grade | H-4 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farmer |
| Township / Ward | Belvidere |
| Est. Birth Year | ~1896 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harold | Age | Birth yr |
|---|---|---|---|---|
| Harold Thomas | Head | — | 44 | ~1896 |
| Marietta Hyland | Other | — | 22 | ~1918 |
| Richard Thomas | Son | — | 11 | ~1929 |
| William Thomas | Son | — | 15 | ~1925 |
| Annetta Thomas | Spouse | — | 41 | ~1899 |
Census Appearances
1920
Boone, Illinois
Other, age 24
Boone, Illinois · implied b. ~1896 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harold C. |
| Relationship to Head | Brother-in-law |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Bookkeeper |
| Industry | Commission Co. |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Boone, Illinois
Head, age 35
Boone, Illinois · implied b. ~1895 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harold C. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 27 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Farmer |
| Industry | Farm |
| Class of Worker | VVVV |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Boone-County, Illinois
Head, age 44
Boone-County, Illinois · implied b. ~1896 — 5 household members
| Surname | Thomas |
| Given Name | Harold E. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Belvidere |
| 1935 Residence (County) | Boone |
| Occupation | Farmer |
| Industry | Farming |
| Class of Worker | OA |
| Hours Worked | 75 |
| Income (1939) | 1200 |
| Highest Grade | H-4 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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.
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This person
Anchor record
Harold Thomas
Head · 1940 · age 44 · b. ~1896 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Boone-County, Illinois
Open full size
1940 US Federal Census — Boone-County, Illinois
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00760-00245)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ralph L. Spearing | 32 | Head | Farmer | Illinois |
| 2 | Bernard F. Spearing | 59 | Father | Farmer | Illinois |
| 3 | Jessie E. Spearing | 49 | Mother | — | Illinois |
| 4 | Donald E. Spearing | 20 | Brother | Labor | Illinois |
| 5 | Louise E. Spearing | 15 | Sister | — | Illinois |
| 6 | Charles W. Fitch | 25 | Head | Laborer | Illinois |
| 7 | Alida M. Fitch | 22 | Sister | — | Illinois |
| 8 | Rose I. Fitch | 18 | Sister | — | Illinois |
| 9 | Gordon P. Fitch | 16 | Brother | — | Illinois |
| 10 | Celestia A. Fitch | 12 | Sister | — | Illinois |
| 11 | Arthur E. Fitch | 20 | Brother | Labor | Illinois |
| 12 | Myra J. Tobyne | 84 | Mother | — | Illinois |
| 13 | Harold E. Thomas THIS PERSON | 44 | Head | Farmer | Illinois |
| 14 | Annetta Thomas | 41 | Wife | — | Illinois |
| 15 | William R. Thomas | 15 | Son | — | Illinois |
| 16 | Richard Thomas | 11 | Son | — | Illinois |
| 17 | Marietta Hyland | 22 | Hired girl | Housework | S. Dakota |
| 18 | Evan Judkins | 34 | Head | Laborer | Illinois |
| 19 | Gertrude Judkins | 24 | Wife | — | Iowa |
| 20 | Donald Judkins | 6 | Son | — | Illinois |
| 21 | Susan D. Judkins | 2 | Daughter | — | Illinois |
| 22 | Emilie E. Shaw | 50 | Head | Income-Renting Her Farm | New York |
| 23 | Betty J. Shaw | 17 | Daughter | — | Illinois |
| 24 | Herman Schmid | 53 | Head | Farmer | Germany |
| 25 | Louise A. Schmid | 41 | Wife | — | Illinois |
| 26 | Maynard Schmid | 21 | Son | Laborer | Illinois |
| 27 | David Schmid | 18 | Son | Laborer | Illinois |
| 28 | Gloria E. Schmid | 12 | Daughter | — | Illinois |
| 29 | Ronald H. Schmid | 3 | Son | — | Illinois |
| 30 | Robert J. Fischer | 46 | Head | Farming | Illinois |
| 31 | Ruth E. Fischer | 44 | Wife | — | Illinois |
| 32 | Edward R. Fischer | 13 | Son | — | Illinois |
| 33 | Ruth M. Fischer | 11 | Daughter | — | Illinois |
| 34 | Roberta Ants | 17 | Visitor | — | Illinois |
| 35 | Wilbur Thompson | 43 | Head | Farmer | Indiana |
| 36 | Irene M. Thompson | 36 | Wife | — | Indiana |
| 37 | Virginia N. Thompson | 18 | Daughter | — | Illinois |
| 38 | Harry W. Thompson | 17 | Son | Laborer | Illinois |
| 39 | Floyd B. Mcbeke | 29 | Worker | Laborer | Illinois |
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)