MD
Mary Dillon — 1940 US Census Record
Model Tree available1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Dillon across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed), with identified parents Joseph & Joseph — first a daughter (b.~1904), then head of a 2-person household.
Age 36
b. ~1904
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Dillon |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Secretary |
| Industry | Coal Mining Co |
| Class of Worker | PW |
| Hours Worked | 38 |
| Income (1939) | 1400 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Secretary |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1904 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Dillon | Daughter | — | 36 | ~1904 |
| Margaret Dillon | Spouse | — | 64 | ~1876 |
Census Appearances
1920
Cook, Illinois
Daughter, age 16
Cook, Illinois · implied b. ~1904 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dillon |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 26
Cook, Illinois · implied b. ~1904 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Dillon |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Ireland Free State |
| Occupation | Stenographer |
| Industry | Insurance 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 36
Cook-County, Illinois · implied b. ~1904 — 2 household members
| Surname | Dillon |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 36 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Secretary |
| Industry | Coal Mining Co |
| Class of Worker | PW |
| Hours Worked | 38 |
| Income (1939) | 1400 |
| Highest Grade | H 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 Dillon across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Dillon (~0.92 confidence) and father Joseph Dillon (~0.92 confidence) and mother Margaret Dillon (~0.92 confidence) and mother Margaret Dillon (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Dillon
b. ~1871
Source father
● Household
· direct · ~0.92
Father
Joseph Dillon
b. ~1871
Source father
● Household
· direct · ~0.92
Mother
Margaret Dillon
b. ~1876
Source mother
● Household
· direct · ~0.92
Mother
Margaret Dillon
b. ~1878
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Dillon
Daughter · 1940 · age 36 · b. ~1904 · 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-t0627-01001-00861)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Margaret Dillon | 64 | Wife | — | Eire |
| 2 | Mary E. Dillon THIS PERSON | 36 | Daughter | Secretary | Illinois |
| 3 | Anton Misik | 56 | Head | Worker | Czechoslovakia |
| 4 | Marie Misik | 52 | Wife | — | Czechoslovakia |
| 5 | Ann Misik | 27 | Daughter | Cashier | Illinois |
| 6 | Extra Line | None | — | — | — |
| 7 | Howard Washburn | 40 | Head | Survey Worker | Illinois |
| 8 | Marie Washburn | 38 | Wife | — | Germany |
| 9 | Howard Jr. Washburn | 20 | Son | Construction W. | Illinois |
| 10 | George Washburn | 9 | Son | — | Illinois |
| 11 | Carl Carlson | 69 | Head | Watchmaker | Sweden |
| 12 | Gust Carlson | 67 | Head | Tailor | Sweden |
| 13 | Hilda Carlson | 64 | Wife | — | Sweden |
| 14 | Laura Liebman | 32 | Daughter | General Helper | Illinois |
| 15 | Richard D. Liebman | 2 | Grandson | — | Illinois |
| 16 | Louis Lau | 44 | Head | Manager | Illinois |
| 17 | Jeanne Lau | 39 | Wife | — | Illinois |
| 18 | Wallace Lau | 16 | Son | — | Illinois |
| 19 | Russell Lau | 14 | Son | — | Illinois |
| 20 | Marsha Lau | 9 | Daughter | — | Illinois |
| 21 | Allen Lau | 4 | Son | — | Illinois |
| 22 | Chas. A. Defrew | 66 | Head | — | Germany |
| 23 | Lola Hefland | 39 | Daughter | — | Illinois |
| 24 | Doris Hefland | 21 | Granddaughter | Waitress | Illinois |
| 25 | Clarice Hefland | 19 | Granddaughter | Buffer | Illinois |
| 26 | Olga Riske | 44 | Head | Cook | Germany |
| 27 | Walter Riske | 24 | Son | Truck Driver | Illinois |
| 28 | Edna Riske | 23 | Daughter | Salesgirl | Illinois |
| 29 | Fred Berthlein | 53 | Head | Pharmacist | Germany |
| 30 | Fred Jr. Berthlein | 27 | Son | Clerk | Illinois |
| 31 | Lawrence Jobst | 43 | Head | Plater Helper | Illinois |
| 32 | Eva Jobst | 43 | Wife | Saleslady | Illinois |
| 33 | Anthony Kolinski | 40 | Head | Timekeeper | Illinois |
| 34 | Sue Kolinski | 36 | Wife | — | Illinois |
| 35 | Raymond Kolinski | 7 | Son | — | Illinois |
| 36 | Norma Kolinski | 2 | Daughter | — | Illinois |
| 37 | Paul Lichtenfels | 57 | Head | Tailor | Germany |
| 38 | Marian Lichtenfels | 50 | Wife | — | Germany |
| 39 | Arthur Johnson | 53 | Head | Bookkeeper | Illinois |
| 40 | Anna B. Johnson | 51 | Wife | — | Illinois |
Pedigree Summary
Mary
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)