OB
Oscar Brown — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Oscar Brown across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Adelaide & Gertrude — first a head (b.~1908), then head of a 3-person household.
Age 32
b. ~1908
Male
Head
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Brown |
| Given Name | Oscar |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Mail Carrier |
| Industry | U.S. Post Office |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 2100 |
| Highest Grade | H 3 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Mail Carrier |
| Township / Ward | Chicago |
| Est. Birth Year | ~1908 |
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 Oscar | Age | Birth yr |
|---|---|---|---|---|
| Ann Brown | Spouse | — | 26 | ~1914 |
| Oscar Brown | Head | — | 32 | ~1908 |
| Phyllis Brown | Daughter | — | 2 | ~1938 |
Census Appearances
1920
Cook, Illinois
Son, age 12
Cook, Illinois · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Oscar |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Son, age 22
Cook, Illinois · implied b. ~1908 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Oscar |
| Relationship to Head | son |
| Sex | M |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Occupation | Laborer |
| Industry | Cement factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 32
Cook-County, Illinois · implied b. ~1908 — 3 household members
| Surname | Brown |
| Given Name | Oscar |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | Black |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Mail Carrier |
| Industry | U.S. Post Office |
| Class of Worker | GW |
| Hours Worked | 40 |
| Income (1939) | 2100 |
| Highest Grade | H 3 |
| 1935 Residence | Same House |
| 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 Oscar Brown across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Adelaide Brown (~0.92 confidence) and mother Gertrude Brown (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Adelaide Brown
b. ~1848
Source mother
● Household
· direct · ~0.92
Mother
Gertrude Brown
b. ~1877
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Oscar Brown
Head · 1940 · age 32 · b. ~1908 · Illinois
★ You are viewing this record
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-t0627-00960-00672)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Lucille Tolafree | 40 | Roomer | Maid | Arkansas |
| 42 | Daniel Burke | 51 | Head | Meat Inspector | Arkansas |
| 43 | Laura Burke | 39 | Wife | — | Arkansas |
| 44 | William Peterson | 65 | Roomer | — | Michigan |
| 45 | Ella Roberts | 56 | Head | — | Georgia |
| 46 | James Roberts | 16 | Son | — | Illinois |
| 47 | William Cain | 60 | Head | Janitor | Alabama |
| 48 | Annie Cain | 45 | Wife | — | Alabama |
| 49 | Eugene Cornelius | 43 | Head | Butcher | Georgia |
| 50 | Annie Cornelius | 35 | Wife | — | Georgia |
| 51 | Inez Harris | 13 | Boarder | — | Illinois |
| 52 | Marie Mack | 13 | Boarder | — | Illinois |
| 53 | James Hawthorn | 7 | Boarder | — | Illinois |
| 54 | Beheyene Thomas | 12 | Boarder | — | Illinois |
| 55 | James Anderson | 44 | Head | Laborer | Illinois |
| 56 | Grace Anderson | 45 | Wife | — | Kentucky |
| 57 | James Jr. Anderson | 10 | Son | — | Illinois |
| 58 | John Anderson | 8 | Son | — | Illinois |
| 59 | Wendell Anderson | 7 | Son | — | Illinois |
| 60 | Wilber Anderson | 7 | Son | — | Illinois |
| 61 | Charles Anderson | 5 | Son | — | Illinois |
| 62 | Harry Mchall | 51 | Head | Music Instr. | Tennessee |
| 63 | Ella Mchall | 56 | Wife | — | Kentucky |
| 64 | Emma Jackson | 45 | Head | — | Louisiana |
| 65 | Nora Sanders | 14 | Niece | — | Illinois |
| 66 | Watchie Campbell | 39 | Roomer | Chauffeur | Tennessee |
| 67 | Herman Frederick | 42 | Head | Barber | Georgia |
| 68 | Mattie Frederick | 43 | Wife | — | Florida |
| 69 | Yvonne Frederick | 14 | Daughter | — | Illinois |
| 70 | Pauline Frederick | 55 | Mother | Maid | Georgia |
| 71 | Geneva Weddington | 13 | Boarder | — | Illinois |
| 72 | Richard Weddington | 12 | Boarder | — | Illinois |
| 73 | Adelaide Brown | 64 | Head | — | Tennessee |
| 74 | Charles Parish | 60 | Brother | Porter | Tennessee |
| 75 | Oscar Brown THIS PERSON | 32 | Head | Mail Carrier | Illinois |
| 76 | Ann Brown | 26 | Wife | — | Mississippi |
| 77 | Phyllis Brown | 2 | Daughter | — | Illinois |
| 78 | Charles Matlock | 48 | Head | Chauffeur | Tennessee |
| 79 | Frances Matlock | 45 | Wife | — | Tennessee |
| 80 | Gloria Matlock | 16 | Daughter | — | Illinois |
Pedigree Summary
Oscar
Gen 1 · 2 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)