MK
Mary Kennedy — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Kennedy across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Henry & Helen — first a daughter (b.~1908), then head of a 4-person household.
Age 32
b. ~1908
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Kennedy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Stenographer |
| Industry | Board of Health |
| Class of Worker | GW |
| Hours Worked | 44 |
| Income (1939) | 2200 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Stenographer |
| 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Kennedy | Daughter | — | 32 | ~1908 |
| Margaret Kennedy | Head | — | 62 | ~1878 |
| John Kennedy | Son | — | 31 | ~1909 |
| Thomas Kennedy | Son | — | 26 | ~1914 |
Census Appearances
1920
Cook, Illinois
Daughter, age 11
Cook, Illinois · implied b. ~1909 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kennedy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 21
Cook, Illinois · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kennedy |
| Given Name | Mary A. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Stenographer |
| Industry | Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 32
Cook-County, Illinois · implied b. ~1908 — 4 household members
| Surname | Kennedy |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | Stenographer |
| Industry | Board of Health |
| Class of Worker | GW |
| Hours Worked | 44 |
| Income (1939) | 2200 |
| 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 Mary Kennedy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Henry Kennedy (~0.92 confidence) and mother Helen Kennedy (~0.92 confidence) and mother Mary Kennedy (~0.92 confidence) and mother Margaret Kennedy (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Henry Kennedy
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Helen Kennedy
b. ~1888
Source mother
● Household
· direct · ~0.92
Mother
Mary Kennedy
b. ~1889
Source mother
● Household
· direct · ~0.92
Mother
Margaret Kennedy
b. ~1878
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Kennedy
Daughter · 1940 · age 32 · b. ~1908 · Illinois
★ You are viewing this record
Sibling
Thomas Kennedy
Sibling · 1940 · age 26
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Kennedy
Sibling · 1940 · age 31
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-t0627-00968-00346)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Peter Dabrowski | 66 | Head | Stevedore | Poland |
| 2 | Mary Dabrowski | 48 | Wife | — | Poland |
| 3 | Lottie Korbas | 27 | Daughter | Typist | Illinois |
| 4 | Stephen Korbas | 27 | Son-in-law | Stevedore | Illinois |
| 5 | Stanley Kasinski | 53 | Head | Mail Clerk | Poland |
| 6 | Charles Majewski | 55 | Head | Time Keeper | Poland |
| 7 | Catherine Majewski | 54 | Wife | — | Illinois |
| 8 | Harold Majewski | 21 | Son | Stock Clerk | Illinois |
| 9 | George Martina | 27 | Head | Shipping Clerk | Illinois |
| 10 | Gertrude Martina | 23 | Wife | — | Illinois |
| 11 | Ignatius Kowalski | 57 | Head | Molder | Poland |
| 12 | Mary Kowalski | 51 | Wife | — | Poland |
| 13 | Edwin Kowalski | 21 | Son | Assembler | Illinois |
| 14 | Regina Kowalski | 19 | Daughter | Assembler | Illinois |
| 15 | Francis Flanagan | 29 | Head | Shipping Clerk | Illinois |
| 16 | Francis Flanagan | 25 | Wife | — | Illinois |
| 17 | Theresa Flanagan | 0 | Daughter | — | Illinois |
| 18 | Marcella Ryba | 54 | Head | Finisher | Poland |
| 19 | Genevieve Ryba | 31 | Daughter | Mach. Oper. | Illinois |
| 20 | Edward Ryba | 21 | Son | Trucker | Illinois |
| 21 | Thomas Rohrbacher | 28 | Head | Butcher | Illinois |
| 22 | Helen Rohrbacher | 29 | Wife | Assembler | Illinois |
| 23 | John Hepple | 68 | Head | — | New York |
| 24 | Carrie B Hepple | 62 | Wife | — | New York |
| 25 | Herbert Berger | 37 | Head | Receiver | Illinois |
| 26 | Amanda Berger | 36 | Wife | — | Illinois |
| 27 | Paul Mueller | 33 | Head | Brush Maker | Germany |
| 28 | Helen Mueller | 26 | Wife | Assembler | Illinois |
| 29 | Frank Breeck | 24 | Head | — | Austria |
| 30 | Frances Breeck | 57 | Wife | — | Illinois |
| 31 | George Johnson | 28 | Son-in-law | Gen Clerk | Scotland |
| 32 | Mildred Johnson | 27 | Daughter | — | Illinois |
| 33 | Dorothy Ann Johnson | 1 | Granddaughter | — | Illinois |
| 34 | Paul Loll | 66 | Head | — | Germany |
| 35 | Mary Loll | 64 | Wife | — | Illinois |
| 36 | Shirley Marnen | 10 | Granddaughter | — | Illinois |
| 37 | Margaret Kennedy | 62 | Head | — | Illinois |
| 38 | Mary Kennedy THIS PERSON | 32 | Daughter | Stenographer | Illinois |
| 39 | John Kennedy | 31 | Son | Civil Engineer | Illinois |
| 40 | Thomas R Kennedy | 26 | Son | Asst. Manager | Illinois |
Pedigree Summary
Mary + 2 siblings
Gen 1 · 4 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)