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John Brock — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this John Brock across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1888), then head of a 8-person household.
Age 52
b. ~1888
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Brock |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | janitor |
| Industry | printing shop |
| Class of Worker | PW |
| Hours Worked | 80 |
| Income (1939) | 1540 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Janitor |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1888 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| John Brock | Head | — | 52 | ~1888 |
| Murray Brock | Son | — | 22 | ~1918 |
| Wilbur Brock | Son | — | 28 | ~1912 |
| Berle Brock | Son | — | 17 | ~1923 |
| Agrah Brock | Other | — | 59 | ~1881 |
| Gertrude Brock | Daughter | — | 25 | ~1915 |
| Jordan Brock | Son | — | 24 | ~1916 |
| Vernon Brock | Son | — | 19 | ~1921 |
Census Appearances
1930
Cook, Illinois
Head, age 42
Cook, Illinois · implied b. ~1888
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Brock |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 22 |
| Father's Birthplace | New Jersey |
| Mother's Birthplace | Ohio |
| Occupation | Laborer |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 33 |
| Radio Set | R |
| Veteran | No |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 52
Cook-County, Illinois · implied b. ~1888 — 8 household members
| Surname | Brock |
| Given Name | John H. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | janitor |
| Industry | printing shop |
| Class of Worker | PW |
| Hours Worked | 80 |
| Income (1939) | 1540 |
| Highest Grade | No 8 |
| 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 Brock across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Brock
Head · 1940 · age 52 · b. ~1888 · Illinois
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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
39 people indexed on this census page (nara:1940:m-t0627-00984-00536)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Dianne Latus | 21 | Daughter | — | Illinois |
| 2 | Walter Streiky | 61 | Head | Worker Sheet Metal | Denmark |
| 3 | Kindam Streiky | 67 | Wife | 0 | Sweden |
| 4 | Marie Streiky | 24 | Daughter | Dressmaker | Minnesota |
| 5 | Theodore Paolek | 31 | Head | Salesman | Poland |
| 6 | Nell Paolek | 28 | Wife | 0 | Illinois |
| 7 | Ronald Paolek | 6 | Son | — | Illinois |
| 8 | Otto Edie | 48 | Head | Conductor | Iowa |
| 9 | Anna Edie | 44 | Wife | 0 | Illinois |
| 10 | John Edie | 18 | Son | 0 | Illinois |
| 11 | Shirley Edie | 17 | Daughter | — | Illinois |
| 12 | Paul Michael | 70 | Head | 0 | Italy |
| 13 | Angela Michael | 80 | Wife | 0 | Italy |
| 15 | Mary Welfing | 72 | Head | Binder | Austria |
| 16 | Frank Welfing | 30 | Son | 0 | South Carolina |
| 17 | Raymond Trager | 30 | Head | Order Clerk | Illinois |
| 18 | Helen Trager | 31 | Wife | 0 | Illinois |
| 19 | Jan Trager | 13 | Son | — | Illinois |
| 20 | Myrae Latta | 48 | Head | Stationary Engineer | Iowa |
| 21 | Myrna Latta | 46 | Wife | — | Pennsylvania |
| 22 | Gerald Witherly | 20 | Step-son | Sheet Metal Worker | Ohio |
| 23 | Mary Colletti | 46 | Head | Floor Lady | Italy |
| 24 | Bernadette Colletti | 27 | Daughter | Assembler | Illinois |
| 25 | John H. Brock THIS PERSON | 52 | Head | Janitor | Illinois |
| 26 | Wilbur Brock | 28 | Son | Printer | Illinois |
| 27 | Gertrude Brock | 25 | Daughter | 0 | Minnesota |
| 28 | Jordan Brock | 24 | Son | Guard Office | Minnesota |
| 29 | Murray Brock | 22 | Son | Stock Clerk | Minnesota |
| 30 | Vernon Brock | 19 | Son | Bottler | Minnesota |
| 31 | Berle Brock | 17 | Son | 0 | Minnesota |
| 32 | Agrah Brock | 59 | Sister | 0 | Illinois |
| 33 | Sam Premo | 66 | Head | 0 | Italy |
| 34 | Peter Premo | 37 | Son | Bartender | Italy |
| 35 | Lizzie Roberts | 41 | Lodger | 0 | Illinois |
| 36 | Jack Fazio | 48 | Head | Moulder | Italy |
| 37 | Mildred Fazio | 37 | Wife | 0 | Illinois |
| 38 | Angelo Fazio | 1 | Daughter | — | Illinois |
| 39 | Maria Motta | 76 | Mother-in-law | 0 | Italy |
| 40 | Victor Chabicki | 47 | Head | Railroad Repair | Michigan |
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)