CT
Clarence Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Clarence Thomas across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Clarence & Terence — first a son (b.~1920), then head of a 4-person household.
Age 20
b. ~1920
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Thomas |
| Given Name | Clarence Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Oak Park Village |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Electrician |
| Industry | Office Building |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 96 |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Electrician |
| Township / Ward | Oak Park Village |
| Est. Birth Year | ~1920 |
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 Clarence | Age | Birth yr |
|---|---|---|---|---|
| Clarence Thomas | Son | — | 20 | ~1920 |
| Mary Thomas | Spouse | — | 44 | ~1896 |
| Betty Thomas | Daughter | — | 16 | ~1924 |
| Clarence Thomas | Head | — | 45 | ~1895 |
Census Appearances
1920
Cook, Illinois
Son, age 1
Cook, Illinois · implied b. ~1919 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Clarence J |
| 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 10
Cook, Illinois · implied b. ~1920 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Clarence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| 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 20
Cook-County, Illinois · implied b. ~1920 — 4 household members
| Surname | Thomas |
| Given Name | Clarence Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Oak Park Village |
| 1935 Residence (County) | Cook |
| Occupation | Electrician |
| Industry | Office Building |
| Class of Worker | PW |
| Hours Worked | 44 |
| Income (1939) | 96 |
| Highest Grade | H-4 |
| 1935 Residence | Same Place |
| 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 Clarence Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Clarence Thomas (~0.92 confidence) and father Terence Thomas (~0.92 confidence) and mother Mary Thomas (~0.92 confidence) and father Clarence Thomas (~0.92 confidence) and mother Mary Thomas (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Clarence Thomas
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Terence Thomas
b. ~1893
Source father
● Household
· direct · ~0.92
Mother
Mary Thomas
b. ~1894
Source mother
● Household
· direct · ~0.92
Father
Clarence Thomas
b. ~1895
Source father
● Household
· direct · ~0.92
Mother
Mary Thomas
b. ~1896
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Clarence Thomas
Son · 1940 · age 20 · b. ~1920 · Illinois
★ You are viewing this record
Sibling
Betty Thomas
Sibling · 1940 · age 16
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-t0627-00784-00880)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Anne Booth | 40 | Daughter | — | Illinois |
| 42 | Ted Booth | 16 | Boarder | — | Illinois |
| 43 | Clarence Thomas | 45 | Head | Electrical Engineer | Illinois |
| 44 | Mary Thomas | 44 | Wife | — | Illinois |
| 45 | Clarence Jr. Thomas THIS PERSON | 20 | Son | Electrician | Illinois |
| 46 | Betty Thomas | 16 | Daughter | — | Illinois |
| 47 | Fred A. Lause | 39 | Head | Receiving Clerk | Canada English |
| 48 | Edith Lause | 38 | Wife | — | Missouri |
| 49 | Edward W. Mallen | 39 | Head | General Maintenance | Illinois |
| 50 | Phyllis Mallen | 39 | Wife | — | Illinois |
| 51 | Rosemary Mallen | 16 | Daughter | — | Illinois |
| 52 | Doris Lee Mallen | 12 | Daughter | — | Illinois |
| 53 | Kenneth Mallen | 10 | Son | — | Illinois |
| 54 | Colleen Mallen | 7 | Daughter | — | Illinois |
| 55 | Gerald Mallen | 5 | Son | — | Illinois |
| 56 | Philip Mallen | 1 | Son | — | Illinois |
| 57 | Ray R. Lowenhaupt | 35 | Head | Teacher | Illinois |
| 58 | Julie Lowenhaupt | 30 | Wife | Teacher | Wisconsin |
| 59 | Horace R. Kendall | 60 | Head | Assembler | Minnesota |
| 60 | Clara Kendall | 64 | Wife | — | Ireland |
| 61 | Delbert Kendall | 28 | Son | Window Decorator | Illinois |
| 62 | Hugh Enos | 33 | Lodger | Education Director | Wisconsin |
| 63 | Bernice Enos | 34 | Lodger | — | Illinois |
| 64 | Amy Enos | 0 | Lodger | — | Illinois |
| 65 | Albert H. Clark | 68 | Head | Professor | Illinois |
| 66 | Kitty E. Clark | 67 | Wife | — | Michigan |
| 67 | Harvey L. Thors | 31 | Head | Patrolman | Illinois |
| 68 | Betty Thors | 29 | Wife | — | Ohio |
| 69 | Donna Rae Thors | 7 | Daughter | — | Illinois |
| 70 | Harlene Thors | 2 | Daughter | — | Illinois |
| 71 | Edward Olmstead | 46 | Head | Proprietor | Illinois |
| 72 | Grace S. Olmstead | 45 | Wife | — | Illinois |
| 73 | Elaine Mae Olmstead | 17 | Daughter | — | Illinois |
| 74 | Arthur E. Parry | 41 | Head | Station Examiner | Minnesota |
| 75 | Helen A. Parry | 41 | Wife | — | Wisconsin |
| 76 | Ends Here | None | BLOCK | — | — |
| 77 | Harold Watters | 46 | Head | Manager | Illinois |
| 78 | Myrtle Watters | 45 | Wife | — | Illinois |
| 79 | Richard Watters | 17 | Son | — | Illinois |
| 80 | John R. Watters | 7 | Son | — | Illinois |
Pedigree Summary
Clarence + 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)