TS
Thomas Sullivan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Thomas Sullivan across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Julia & John — first a son (b.~1919), then head of a 3-person household.
Age 21
b. ~1919
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Sullivan |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Laborer |
| Industry | Wholesale Candy |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 988 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Laborer |
| Township / Ward | Chicago 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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Julia Sullivan | Head | — | 57 | ~1883 |
| Thomas Sullivan | Son | — | 21 | ~1919 |
| James Sullivan | Son | — | 32 | ~1908 |
Census Appearances
1920
Cook, Illinois
Son, age
Cook, Illinois · implied b. ~1920 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 0 |
| 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 — 13 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Sullivan |
| Given Name | Thomas |
| 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 21
Cook-County, Illinois · implied b. ~1919 — 3 household members
| Surname | Sullivan |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Laborer |
| Industry | Wholesale Candy |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 988 |
| Highest Grade | Hs 2 |
| 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 Thomas Sullivan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Julia Sullivan (~0.92 confidence) and father John Sullivan (~0.92 confidence) and mother Mary Sullivan (~0.92 confidence) and father John Sullivan (~0.92 confidence) and mother Mary Sullivan (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Julia Sullivan
b. ~1883
Source mother
● Household
· direct · ~0.92
Father
John Sullivan
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Mary Sullivan
b. ~1888
Source mother
● Household
· direct · ~0.92
Father
John Sullivan
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Mary Sullivan
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Thomas Sullivan
Son · 1940 · age 21 · b. ~1919 · Illinois
★ You are viewing this record
Sibling
James Sullivan
Sibling · 1940 · age 32
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-t0627-00990-00108)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Florence Einthal | 52 | Wife | Sales Lady | Russia |
| 2 | Leon Einthal | 26 | Son | Electrician | Illinois |
| 3 | Charles Muillet | Maillet | 50 | Head | Mechanic | Illinois |
| 4 | Delores Muillet | Maillet | 46 | Wife | — | Missouri |
| 5 | Leah Muillet | Maillet | 27 | Daughter | Nursemaid | Illinois |
| 6 | Isadore Ward | 46 | Head | Janitor | Russia |
| 7 | Mary Ward | 41 | Wife | — | Russia |
| 8 | Bernice Ward | 10 | Daughter | — | Illinois |
| 9 | Irving Kelsinger | 30 | Head | Accountant | Illinois |
| 10 | Ellen Kelsinger | 30 | Wife | Typist | Illinois |
| 11 | Hyman Farenbok | 33 | Head | Waiter | Illinois |
| 12 | Esther Farenbok | 29 | Wife | — | Kentucky |
| 13 | Irwin Farenbok | 11 | Son | — | Illinois |
| 14 | Walter Kalin | 41 | Head | Collector | Illinois |
| 15 | Dorothy Kalin | 39 | Wife | — | Illinois |
| 16 | Walter Kalin | 11 | Son | — | Illinois |
| 17 | Le Roy Kalin | 10 | Son | — | Illinois |
| 18 | Dorothy Kalin | 5 | Daughter | — | Illinois |
| 19 | Elsa Wathall | 59 | Head | — | Illinois |
| 20 | Frances Wathall | 38 | Daughter | Psychologist | Illinois |
| 21 | Agnes Wathall | 33 | Daughter | Correspondent | Illinois |
| 22 | Walter Zenik | 52 | Brother | Watchman | Illinois |
| 23 | Emma Watts | 92 | Head | — | Vermont |
| 24 | Maude Watts | 60 | Daughter | Teacher | Illinois |
| 25 | Laurence Cater | 41 | Head | Painter | Indiana |
| 26 | Marie Cater | 40 | Wife | — | Illinois |
| 27 | Charles Dahl | 32 | Head | Maintenance Man | Illinois |
| 28 | Robert Bolcer | 26 | Head | Clerk | Illinois |
| 29 | Irene Bolcer | 29 | Wife | Typist | Illinois |
| 30 | Kasmer Galanski | 57 | Head | Laborer | Russia |
| 31 | Josephine Galanski | 50 | Wife | — | Russia |
| 32 | Harold Sweet | 30 | Head | Painter | Illinois |
| 33 | Esther Sweet | 23 | Wife | Stenographer | Illinois |
| 34 | Julia Sullivan | 57 | Head | — | Illinois |
| 35 | James Sullivan | 32 | Son | Laborer | Illinois |
| 36 | Thomas Sullivan THIS PERSON | 21 | Son | Laborer | Illinois |
| 37 | Joseph Olson | 57 | Head | — | Wisconsin |
| 38 | Walter Olson | 30 | Son | Repair Man | Illinois |
| 39 | Hazel Olson | 23 | Daughter | Nursemaid | Wisconsin |
| 40 | Geraldine Olson | 10 | Daughter | — | Illinois |
Pedigree Summary
Thomas + 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)