HT
Harry Thomas — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Harry Thomas across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Agnes & Sylvester — first a son (b.~1913), then head of a 3-person household.
Age 27
b. ~1913
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Thomas |
| Given Name | Harry |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | City of Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | City Of Chicago |
| Est. Birth Year | ~1913 |
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 Harry | Age | Birth yr |
|---|---|---|---|---|
| Agnes Thomas | Head | — | 67 | ~1873 |
| William Thomas | Son | — | 38 | ~1902 |
| Harry Thomas | Son | — | 27 | ~1913 |
Census Appearances
1920
Cook, Illinois
Son, age 4
Cook, Illinois · implied b. ~1916 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harry |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| 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 15
Cook, Illinois · implied b. ~1915 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Thomas |
| Given Name | Harry |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| 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 27
Cook-County, Illinois · implied b. ~1913 — 3 household members
| Surname | Thomas |
| Given Name | Harry |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 27 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | City of Chicago |
| 1935 Residence (County) | Cook |
| Hours Worked | 0 |
| Highest Grade | 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 Harry Thomas across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Agnes Thomas (~0.92 confidence) and father Sylvester Thomas (~0.92 confidence) and mother Lora Thomas (~0.92 confidence) and father Edward Thomas (~0.92 confidence) and mother Lillian Thomas (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Agnes Thomas
b. ~1873
Source mother
● Household
· direct · ~0.92
Father
Sylvester Thomas
b. ~1882
Source father
● Household
· direct · ~0.92
Mother
Lora Thomas
b. ~1883
Source mother
● Household
· direct · ~0.92
Father
Edward Thomas
b. ~1895
Source father
● Household
· direct · ~0.92
Mother
Lillian Thomas
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harry Thomas
Son · 1940 · age 27 · b. ~1913 · Illinois
★ You are viewing this record
Sibling
William Thomas
Sibling · 1940 · age 38
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-t0627-01010-00238)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frances Bogart | 33 | Head | — | Illinois |
| 2 | Mary Bogart | 8 | Daughter | — | Illinois |
| 3 | Joan Bogart | 2 | Daughter | — | Illinois |
| 4 | Emma Nokomza | 47 | Head | Cook | Germany |
| 5 | Leo Nokomza | 17 | Son | Helper | Germany |
| 6 | Richard Mack | 34 | Head | Baker | Michigan |
| 7 | Gertrude Mack | 33 | Wife | — | Illinois |
| 8 | Donald Mack | 5 | Son | — | Illinois |
| 9 | Edward Moran | 44 | Head | Presser | Illinois |
| 10 | Celia Moran | 44 | Wife | — | New York |
| 11 | Edward Jr Moran | 16 | Son | — | Illinois |
| 12 | Loretta Moran | 13 | Daughter | — | Illinois |
| 13 | Eileen Moran | 10 | Daughter | — | Illinois |
| 14 | Shirley Moran | 4 | Daughter | — | Illinois |
| 15 | Barbara Moran | 2 | Daughter | — | Illinois |
| 16 | Joseph Smith | 57 | Head | Salesman | Illinois |
| 17 | Helen Smith | 55 | Wife | — | Illinois |
| 18 | Dean William Smith | 18 | Son | Messenger | Oklahoma |
| 19 | Emil Rasmussen | 63 | Brother in law | Regulator | New York |
| 20 | Oliver Rasmussen | 59 | Brother in law | — | Illinois |
| 21 | Agnes Thomas | 67 | Head | — | Ireland |
| 22 | William Thomas | 38 | Son | — | Illinois |
| 23 | Harry Thomas THIS PERSON | 27 | Son | — | Illinois |
| 24 | James Healy | 32 | Head | Porter | Illinois |
| 25 | Mary Healy | 38 | Wife | — | Scotland |
| 26 | Walter Garrity | 40 | Head | Teamster | Illinois |
| 27 | Mary Garrity | 40 | Wife | — | Illinois |
| 28 | Walter Jr Garrity | 10 | Son | — | Illinois |
| 29 | Joseph Lynch | 35 | Head | Chauffeur | Minnesota |
| 30 | Ruth Lynch | 27 | Wife | — | South Dakota |
| 31 | Joseph Jr Lynch | 2 | Son | — | Illinois |
| 32 | Patricia Lynch | 1 | Daughter | — | Illinois |
| 33 | William Hollenback | 23 | Head | Coal Picker | Nebraska |
| 34 | Amelia Hollenback | 22 | Wife | — | Illinois |
| 35 | Annie Kennedy | 84 | Head | — | New York |
| 36 | John Kennedy | 49 | Son | Rodman And Chainman | Illinois |
| 37 | Vacant | None | — | — | — |
| 38 | Lena Williams | 49 | Head | — | South America |
| 39 | Anita Williams | 25 | Daughter | Saleslady | Illinois |
| 40 | Frank Williams | 27 | Son | Salesman | Illinois |
Pedigree Summary
Harry + 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)