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Jack Brown — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Jack Brown across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 7-person household.
Age 20
b. ~1920
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Brown |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | shipping clerk |
| Industry | wholesale manufacturing |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 800 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Shipping Clerk |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1920 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Jack | Age | Birth yr |
|---|---|---|---|---|
| Reisha Rosenberg | Daughter | — | ~1940 | |
| Mildred Rosenberg | Daughter | — | 24 | ~1916 |
| Morris Brown | Head | — | 50 | ~1890 |
| Leonard Rosenberg | Other | — | 25 | ~1915 |
| Jack Brown | Son | — | 20 | ~1920 |
| Irving Brown | Son | — | 26 | ~1914 |
| Anna Brown | Spouse | — | 47 | ~1893 |
Census Appearances
1930
Cook, Illinois
Son, age 10
Cook, Illinois · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Lithuania |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Son, age 20
Cook-County, Illinois · implied b. ~1920 — 7 household members
| Surname | Brown |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | shipping clerk |
| Industry | wholesale manufacturing |
| Class of Worker | PW |
| Hours Worked | 42 |
| Income (1939) | 800 |
| Highest Grade | Hs 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 Jack Brown across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Jack Brown
Son · 1940 · age 20 · b. ~1920 · Illinois
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Sibling
Mildred Rosenberg
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irving Brown
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Reisha Rosenberg
Sibling · 1940 · age
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-t0627-00999-00222)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Martha Oszewski | 26 | Sister | Waitress | Illinois |
| 42 | Howard Sheldon | 37 | Head | Clerk | Illinois |
| 43 | Alma Sheldon | 37 | Wife | None | Illinois |
| 44 | Dorothy Sheldon | 3 | Daughter | — | Illinois |
| 45 | Harry Schuch | 42 | Head | Laborer | Hungary |
| 46 | Elsie S. Schuch | 39 | Wife | None | Hungary |
| 47 | Isadore Schuch | 8 | Son | — | Illinois |
| 48 | Helen Schuch | 7 | Daughter | — | Illinois |
| 49 | Marlene Schuch | 4 | Daughter | — | Illinois |
| 50 | Allan Schuch | 1 | Son | — | Illinois |
| 51 | Sol Friedman | 18 | Lodger | Delivery Boy | Illinois |
| 52 | Martin Friedman | 14 | Lodger | — | Illinois |
| 53 | Lee Rootes | 35 | Head | Automobile Mechanic | France |
| 54 | Molly Rootes | 35 | Wife | None | Illinois |
| 55 | Donald Rootes | 14 | Son | — | Illinois |
| 56 | Lillian Rootes | 11 | Daughter | — | Illinois |
| 57 | William Baumbeck | 35 | Head | Engineer | Illinois |
| 58 | Dorothy Baumbeck | 27 | Wife | Inspector | Illinois |
| 59 | Barbara Ann Baumbeck | 8 | Daughter | — | Illinois |
| 60 | Dorothy Baumbeck | 5 | Daughter | — | Illinois |
| 61 | Should Be 58 | None | blank | — | blank |
| 62 | Morris Brown | 50 | Head | Proprietor | Poland |
| 63 | Anna Brown | 47 | Wife | None | Lithuania |
| 64 | Irving Brown | 26 | Son | Collector | Illinois |
| 65 | Jack Brown THIS PERSON | 20 | Son | Shipping Clerk | Illinois |
| 66 | Leonard Rosenberg | 25 | Son-in-law | Salesman | Illinois |
| 67 | Mildred Rosenberg | 24 | Daughter | None | Illinois |
| 68 | Reisha Rosenberg | 0 | Daughter | — | Illinois |
| 69 | Phil Berkowitz | 47 | Head | Tailor | Hungary |
| 70 | Martha Berkowitz | 43 | Wife | None | Maryland |
| 71 | Leroy Berkowitz | 20 | Son | Distance Driver | Illinois |
| 72 | Harriett Berkowitz | 19 | Daughter | Bookkeeper | Illinois |
| 73 | Beverly Berkowitz | 16 | Daughter | — | Illinois |
| 74 | Raymond Berkowitz | 13 | Son | — | Illinois |
| 75 | Howard Berkowitz | 7 | Son | — | Illinois |
| 76 | Joseph Hellman | 59 | Head | Furrier | Russia |
| 77 | Ida Hellman | 54 | Wife | None | Russia |
| 78 | Harry Hellman | 32 | Son | Traffic Manager | Illinois |
| 79 | Eli Hellman | 23 | Son | Salesman | Illinois |
| 80 | Libby Hellman | 20 | Daughter | Stenographer | 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)