JC
John Crosby — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Crosby across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1924), then head of a 5-person household.
Age 16
b. ~1924
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Crosby |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H 3 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1924 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Crosby | Head | — | 44 | ~1896 |
| John Crosby | Son | — | 16 | ~1924 |
| Mary Crosby | Spouse | — | 44 | ~1896 |
| Lawrence Crosby | Son | — | 14 | ~1926 |
| Joan Crosby | Daughter | — | 6 | ~1934 |
Census Appearances
1930
Cook, Illinois
Son, age 6
Cook, Illinois · implied b. ~1924 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Crosby |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 6 |
| 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 16
Cook-County, Illinois · implied b. ~1924 — 5 household members
| Surname | Crosby |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Class of Worker | 0 |
| Hours Worked | 0 |
| Highest Grade | H 3 |
| 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 John Crosby across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Crosby
Son · 1940 · age 16 · b. ~1924 · Illinois
★ You are viewing this record
Sibling
Lawrence Crosby
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Crosby
Sibling · 1940 · age 6
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-t0627-00977-00204)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Simone Cutrona | 55 | Head | Factory Hand | Italy |
| 42 | Vita Cutrona | 45 | Wife | — | Italy |
| 43 | Mary Cutrona | 26 | Daughter | Pantry Girl | Italy |
| 44 | Jenny Cutrona | 23 | Daughter | Seamstress | Illinois |
| 45 | Ann Cutrona | 21 | Daughter | Seamstress | Illinois |
| 46 | Francis Cutrona | 20 | Daughter | Seamstress | Illinois |
| 47 | Irene Cutrona | 18 | Daughter | File Clerk | Illinois |
| 48 | Ruth Cutrona | 16 | Daughter | — | Illinois |
| 49 | Evelyn Cutrona | 11 | Daughter | — | Illinois |
| 50 | Daniel Cutrona | 7 | Son | — | Illinois |
| 51 | Annette Lombardo | 63 | Lodger | Sheller | Italy |
| 52 | Paul Jerz | 67 | Head | Car Repair | Poland |
| 53 | Balwina Jerz | 64 | Wife | — | Poland |
| 54 | Gene Jerz | 24 | Son | Proprietor | Illinois |
| 55 | John Crosby | 44 | Head | Switchman | Illinois |
| 56 | Mary Crosby | 44 | Wife | — | Hungary |
| 57 | John Crosby THIS PERSON | 16 | Son | — | Illinois |
| 58 | Lawrence Crosby | 14 | Son | — | Illinois |
| 59 | Joan A Crosby | 6 | Daughter | — | Illinois |
| 60 | Joseph Jerz | 30 | Head | Service Man | Illinois |
| 61 | Bernice Jerz | 27 | Wife | — | Illinois |
| 62 | Barbara Jerz | 2 | Daughter | — | Illinois |
| 63 | Patsy Cardonara | 44 | Head | Presser | Italy |
| 64 | Susie Cardonara | 35 | Wife | — | Illinois |
| 65 | Angeline Cardonara | 16 | Daughter | — | Illinois |
| 66 | Alex Cardonara | 14 | Son | — | Illinois |
| 67 | Vito Cardonara | 11 | Son | — | Illinois |
| 68 | Jean Cardonara | 4 | Daughter | — | Illinois |
| 69 | Stanley Wodek | 47 | Head | Labor Foreman | Illinois |
| 70 | Rose Wodek | 45 | Wife | — | Illinois |
| 71 | Kenneth Wodek | 15 | Son | — | Illinois |
| 72 | Annette Wodek | 11 | Daughter | — | Illinois |
| 73 | Andrew Rezula | 63 | Head | — | Poland |
| 74 | Antonia Rezula | 60 | Wife | — | Poland |
| 75 | Bernice Rezula | 26 | Daughter | Eyeletine | Illinois |
| 76 | Theresa Rezula | 24 | Daughter | Sticher | Illinois |
| 77 | Ted Rezula | 21 | Son | Laborer | Illinois |
| 78 | Henry Rezula | 19 | Son | New Worker | Illinois |
| 79 | Clarence Rezula | 17 | Son | — | Illinois |
| 80 | Richard Rezula | 15 | 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)