HT
Harold Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Harold Thomas across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Joseph & Anna — first a son (b.~1919), then head of a 4-person household.
Age 21
b. ~1919
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Thomas |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Machinist |
| Industry | Enamel Products Factory |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 88 |
| Highest Grade | H-8 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Machinist |
| Township / Ward | Berwyn City |
| Est. Birth Year | ~1919 |
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 |
|---|---|---|---|---|
| Anna Thomas | Spouse | — | 49 | ~1891 |
| Harold Thomas | Son | — | 21 | ~1919 |
| Joseph Thomas | Head | — | 52 | ~1888 |
| Otto Thomas | Son | — | 18 | ~1922 |
Census Appearances
1920
Cook, Illinois
Son, age 1
Cook, Illinois · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 11
Cook, Illinois · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 21
Cook-County, Illinois · implied b. ~1919 — 4 household members
| Surname | Thomas |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Machinist |
| Industry | Enamel Products Factory |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 88 |
| Highest Grade | H-8 |
| 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. Identified parents: father Joseph Thomas (~0.92 confidence) and mother Anna Thomas (~0.92 confidence) and father Gerlach Thomas (~0.92 confidence) and mother Irene Thomas (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Thomas
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Anna Thomas
b. ~1891
Source mother
● Household
· direct · ~0.92
Father
Gerlach Thomas
b. ~1892
Source father
● Household
· direct · ~0.92
Mother
Irene Thomas
b. ~1894
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Thomas
Son · 1940 · age 21 · b. ~1919 · Illinois
★ You are viewing this record
Sibling
Otto Thomas
Sibling · 1940 · age 18
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 — Cook-County, Illinois
Open full size
1940 US Federal Census — Cook-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00772-00542)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | William Chalt | 22 | Brother | Clerk (Office) | Pennsylvania |
| 42 | Edward Chalt | 20 | Brother | Hand Boy | Pennsylvania |
| 43 | James Hughes | 57 | Head | Mail Supervisor | Irish Free State |
| 44 | Mary Hughes | 46 | Wife | — | Irish Free State |
| 45 | Thomas Whartle | 31 | Head | Executive | Illinois |
| 46 | Theodora Whartle | 31 | Wife | — | Illinois |
| 47 | John Whartle | 2 | Son | — | Illinois |
| 48 | Frank Stamm | 33 | Head | Salesman | Illinois |
| 49 | Mae B. Stamm | 32 | Wife | — | Sweden |
| 50 | Donald Stamm | 13 | Son | — | Illinois |
| 51 | Richard Stamm | 5 | Son | — | Illinois |
| 52 | Roy Richards | 47 | Head | Analyst | Illinois |
| 53 | Helen Richards | 39 | Wife | — | Illinois |
| 54 | Rosaline Richards | 10 | Daughter | — | Illinois |
| 55 | Leslie Behnke | 35 | Head | Proprietor | Iowa |
| 56 | Jeanne Behnke | 36 | Wife | — | Iowa |
| 57 | William Schroeder | 52 | Head | — | Germany |
| 58 | Ida Schroeder | 52 | Wife | — | Germany |
| 59 | Caroline Sass | 29 | Daughter | Bookkeeper | Maryland |
| 60 | Hermine Sass | 24 | Daughter | Bookkeeper | Maryland |
| 61 | George Slaby | 41 | Head | Salesman | Illinois |
| 62 | Pansy Slaby | 39 | Wife | Telephone Operator | Illinois |
| 63 | Pansy Slaby | 20 | Daughter | Soliciting | Illinois |
| 64 | George Slaby | 19 | Son | Order Filler | Illinois |
| 65 | Edward Slaby | 66 | Father | — | Illinois |
| 66 | August Slaby | 64 | Uncle | — | Illinois |
| 67 | Carl Wright | 49 | Head | Safety Supervisor | Maryland |
| 68 | Margaret Wright | 46 | Wife | — | Maryland |
| 69 | Dorothy Wright | 16 | Daughter | — | Illinois |
| 70 | Marjorie Wright | 9 | Daughter | — | Illinois |
| 71 | Joseph Thomas | 52 | Head | Papercutter | Illinois |
| 72 | Anna Thomas | 49 | Wife | — | Illinois |
| 73 | Harold Thomas THIS PERSON | 21 | Son | Machinist | Illinois |
| 74 | Otto Thomas | 18 | Son | Setter | Illinois |
| 75 | Bruce Lozier | 34 | Head | Business Methods Analyst | North Dakota |
| 76 | Bessie Lozier | 30 | Wife | — | Illinois |
| 77 | Duane Lozier | 7 | Daughter | — | Illinois |
| 78 | Kathryn Lozier | 4 | Daughter | — | Illinois |
| 79 | Philip Carlson | 35 | Head | Clerk | Illinois |
| 80 | Claire Carlson | 31 | Wife | — | Illinois |
Pedigree Summary
Harold + 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)