MS
Mary Smith — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Smith across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents John & Sally — first a daughter (b.~1918), then head of a 7-person household.
Age 22
b. ~1918
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Smith |
| Given Name | Mary Y. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Housework |
| Industry | Private Family |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 86 |
| Highest Grade | H 4-3 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Housework |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1918 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Barbara Smith | Daughter | — | 3 | ~1937 |
| Mary Smith | Daughter | — | 22 | ~1918 |
| Sally Smith | Head | — | 42 | ~1898 |
| Carl Smith | Son | — | 20 | ~1920 |
| James Smith | Son | — | 23 | ~1917 |
| Albert Smith | Son | — | 15 | ~1925 |
| David Smith | Son | — | 17 | ~1923 |
Census Appearances
1920
Cook, Illinois
Daughter, age 2
Cook, Illinois · implied b. ~1918 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 12
Cook, Illinois · implied b. ~1918 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 12 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 22
Cook-County, Illinois · implied b. ~1918 — 7 household members
| Surname | Smith |
| Given Name | Mary Y. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 22 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Housework |
| Industry | Private Family |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 86 |
| Highest Grade | H 4-3 |
| 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 Mary Smith across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Smith (~0.92 confidence) and mother Sally Smith (~0.92 confidence) and mother Katherine Smith (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Smith
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Sally Smith
b. ~1898
Source mother
● Household
· direct · ~0.92
Mother
Katherine Smith
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Smith
Daughter · 1940 · age 22 · b. ~1918 · Illinois
★ You are viewing this record
Sibling
James Smith
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Carl Smith
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Smith
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Barbara Smith
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Albert Smith
Sibling · 1940 · age 15
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-t0627-00977-00821)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Lucious Mortimer | 28 | Head | Laborer | Georgia |
| 2 | Lenora Mortimer | 23 | Wife | — | Mississippi |
| 3 | Lucious Jr Mortimer | 3 | Son | — | Illinois |
| 4 | Delores Mortimer | 2 | Daughter | — | Illinois |
| 5 | Johnny Mortimer | 0 | Son | — | Illinois |
| 6 | Ernest S Polen | 48 | Lodger | — | Louisiana |
| 7 | Brown Adalberto | 33 | Head | — | Tennessee |
| 8 | Wilbert Adalberto | 17 | Son | — | Illinois |
| 9 | Laura Adalberto | 13 | Daughter | — | Illinois |
| 10 | M Mary Holloway | 70 | Head | — | Missouri |
| 11 | Isaac Nelson | 55 | Head | — | Alabama |
| 12 | Ella Nelson | 50 | Wife | — | Alabama |
| 13 | Berick Harris | 31 | Son-in-law | Chicken Cleaner | Louisiana |
| 14 | Bertha Harris | 29 | Daughter | — | Alabama |
| 15 | Leslie Pedro | 18 | Lodger | Laborer | Missouri |
| 16 | Sally Smith | 42 | Head | — | Tennessee |
| 17 | James Smith | 23 | Son | Laborer | Illinois |
| 18 | Mary Y. Smith THIS PERSON | 22 | Daughter | Housework | Illinois |
| 19 | Carl Smith | 20 | Son | Laborer | Illinois |
| 20 | David Smith | 17 | Son | New Worker | Illinois |
| 21 | Albert Smith | 15 | Son | — | Illinois |
| 22 | Barbara Smith | 3 | Daughter | — | Illinois |
| 23 | Edward White | 39 | Head | Paper Cutter | Illinois |
| 24 | Russell White | 32 | Lodger | — | Ohio |
| 25 | Charles White | 13 | Lodger | — | Illinois |
| 26 | John Prackman | 28 | Lodger | Laborer | Illinois |
| 27 | Line Extra | None | — | — | — |
| 28 | General Coleman | 75 | Head | — | Virginia |
| 29 | Mabel Coleman | 58 | Wife | — | Michigan |
| 30 | Dorothy Coleman | 17 | Daughter | New Worker | Illinois |
| 31 | Wayne Coleman | 5 | Son | — | Illinois |
| 32 | Laverne Coleman | 0 | Daughter | — | Illinois |
| 33 | John Williams | 35 | Head | Laborer | Georgia |
| 34 | Cora Williams | 33 | Wife | Housework | Kentucky |
| 35 | Maurice Williams | 25 | Nephew | Butcher | Georgia |
| 36 | Leola Williams | 34 | Neice | — | Alabama |
| 37 | Rudora Williams | 1 | Grand Neice | — | Illinois |
| 38 | James Jackson | 41 | Head | — | Alabama |
| 39 | Richard Jackson | 34 | Son | Laborer | Alabama |
| 40 | Katherine Jackson | 18 | Daughter | — | Illinois |
Pedigree Summary
Mary + 5 siblings
Gen 1 · 3 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)