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Thomas Black — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Thomas Black across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1929), then head of a 8-person household.
Age 11
b. ~1929
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Black |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | No 2 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1929 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Thomas | Age | Birth yr |
|---|---|---|---|---|
| Thomas Black | Son | — | 11 | ~1929 |
| James Black | Son | — | 19 | ~1921 |
| Mary Black | Daughter | — | 17 | ~1923 |
| Beverly Black | Daughter | — | 1 | ~1939 |
| Betty Black | Daughter | — | 13 | ~1927 |
| Albert Black | Head | — | 47 | ~1893 |
| Gladys Black | Spouse | — | 39 | ~1901 |
| Donald Black | Son | — | 4 | ~1936 |
Census Appearances
1930
Cook, Illinois
Son, age
Cook, Illinois · implied b. ~1930 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Black |
| 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 |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 11
Cook-County, Illinois · implied b. ~1929 — 8 household members
| Surname | Black |
| Given Name | Thomas |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Highest Grade | No 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 Black across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Thomas Black
Son · 1940 · age 11 · b. ~1929 · Illinois
★ You are viewing this record
Sibling
Donald Black
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Black
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Black
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Black
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Beverly Black
Sibling · 1940 · age 1
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-t0627-00964-00371)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John Koiss | 63 | Head | Salesman | Poland |
| 2 | Angelina Koiss | 50 | Wife | — | Poland |
| 3 | Stella Koiss | 23 | Daughter | Shirt Presser | Illinois |
| 4 | John Jr. Koiss | 33 | Head | Repairman | Illinois |
| 5 | Sophie Koiss | 30 | Wife | — | Illinois |
| 6 | Mary Ann Koiss | 6 | Daughter | — | Illinois |
| 7 | Tekla Koiss | 3 | Daughter | — | Illinois |
| 8 | Albert Black | 47 | Head | Truck Driver | Kansas |
| 9 | Gladys Black | 39 | Wife | — | Wisconsin |
| 10 | James Black | 19 | Son | Laborer | Wisconsin |
| 11 | Mary Black | 17 | Daughter | New Worker | Wisconsin |
| 12 | Betty Black | 13 | Daughter | — | Illinois |
| 13 | Thomas Black THIS PERSON | 11 | Son | — | Illinois |
| 14 | Donald Black | 4 | Son | — | Illinois |
| 15 | Beverly Black | 1 | Daughter | — | Illinois |
| 16 | Walter Majewski | 45 | Head | Milling Machine | Poland |
| 17 | Emma Majewski | 42 | Wife | — | Poland |
| 18 | Cecilia Majewski | 21 | Daughter | Helper | Illinois |
| 19 | Henry (A) Majewski | 19 | Son | Carpenter | Illinois |
| 20 | Lillian Majewski | 17 | Daughter | Waitress | Illinois |
| 21 | Loretta Majewski | 15 | Daughter | — | Illinois |
| 22 | Teddy Majewski | 13 | Son | — | Illinois |
| 23 | Alice Majewski | 10 | Daughter | — | Illinois |
| 24 | Eugene Majewski | 9 | Son | — | Illinois |
| 25 | Joe Pawlikowski | 49 | Head | Receiver | Poland |
| 26 | Alice Pawlikowski | 37 | Wife | — | Poland |
| 27 | Chester Pawlikowski | 11 | Son | — | Michigan |
| 28 | Mamie Pawlikowski | 10 | Daughter | — | Michigan |
| 29 | Eddie Gurek | 17 | Son | — | Illinois |
| 30 | Stephanie Gurek | 16 | Daughter | — | Illinois |
| 31 | Helen Gurek | 14 | Daughter | — | Michigan |
| 32 | Bernard Posing | 23 | Head | Washer | Illinois |
| 33 | Helen Posing | 22 | Wife | — | Illinois |
| 34 | Dolores Posing | 1 | Daughter | — | Illinois |
| 35 | Frank Klemik | 57 | Head | Janitor | Poland |
| 36 | Ella Klemik | 48 | Wife | Cleaner | Poland |
| 37 | Frank Klemik | 21 | Son | Apprentice | Illinois |
| 38 | John Klemik | 19 | Son | Laborer | Illinois |
| 39 | Bernice Oleksy | 24 | Head | Office Cleaner | Illinois |
| 40 | Ernest Oleksy | 3 | Son | — | 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)