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Mary Mcdonough — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Mcdonough across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1921), then head of a 7-person household.
Age 19
b. ~1921
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McDonough |
| Given Name | Mary J |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Operator |
| Industry | Telephone |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1040 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Operator |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1921 |
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 |
|---|---|---|---|---|
| Mary Mcdonough | Daughter | — | 19 | ~1921 |
| William Mcdonough | Head | — | 50 | ~1890 |
| Bessie Hummel | Other | — | 35 | ~1905 |
| Hugh Mcdonough | Son | — | 12 | ~1928 |
| James Mcdonough | Son | — | 16 | ~1924 |
| William Mcdonough | Son | — | 18 | ~1922 |
| Florence Mcdonough | Spouse | — | 45 | ~1895 |
Census Appearances
1930
Cook, Illinois
Daughter, age 9
Cook, Illinois · implied b. ~1921 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonough |
| Given Name | Mary J. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 9 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | New York |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 19
Cook-County, Illinois · implied b. ~1921 — 7 household members
| Surname | McDonough |
| Given Name | Mary J |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Operator |
| Industry | Telephone |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1040 |
| Highest Grade | Hs 4 |
| 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 Mary Mcdonough across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mcdonough
Daughter · 1940 · age 19 · b. ~1921 · Illinois
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Sibling
William Mcdonough
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hugh Mcdonough
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Mcdonough
Sibling · 1940 · age 16
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-t0627-00957-01019)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Fern A Kosmalski | 44 | Wife | — | Ohio |
| 2 | Lynn Kosmalski | 9 | Daughter | — | Illinois |
| 3 | John C Gurney | 47 | Head | Purchasing Agent | Michigan |
| 4 | Margrita Gurney | 46 | Wife | — | Illinois |
| 5 | William C Gurney | 16 | Son | — | Illinois |
| 6 | John A Gurney | 9 | Son | — | Illinois |
| 7 | Margaret Kuehner | 69 | Mother in law | — | Germany |
| 8 | Mchill Maage | 46 | Head | Office Clerk | Illinois |
| 9 | Mitalda Maage | 46 | Wife | — | Illinois |
| 10 | Lorraine Maage | 15 | Daughter | — | Illinois |
| 11 | H J Porter | 55 | Head | Lino-Typer | Maine |
| 12 | Amillie A Porter | 57 | Wife | — | Illinois |
| 13 | Alois Hoeflein | 71 | Head | — | Germany |
| 14 | Marie Hoeflein | 70 | Wife | — | Germany |
| 15 | Esther Hoeflein | 31 | Daughter | Stenographer | Illinois |
| 16 | Linnman Johnson | 33 | Head | Elevator Man | Illinois |
| 17 | Catherine Johnson | 64 | Lodger | — | England |
| 18 | Robert Maury | 48 | Son-in-law | Office Clerk | Illinois |
| 19 | Otto Jordan | 48 | Head | Department Manager | Illinois |
| 20 | Barbara Jordan | 45 | Wife | — | Illinois |
| 21 | Otto Jordan | 12 | Son | — | Illinois |
| 22 | Barbara Jordan | 10 | Daughter | — | Illinois |
| 23 | Delores Jordan | 6 | Daughter | — | Illinois |
| 24 | Raymond Zerber | 41 | Head | Fireman | Illinois |
| 25 | Nora M Zerber | 40 | Wife | — | Illinois |
| 26 | Jessie L Farzona | 69 | Mother | — | Illinois |
| 27 | William Mcdonough | 50 | Head | Bricklayer | Illinois |
| 28 | Florence Mcdonough | 45 | Wife | — | Illinois |
| 29 | Mary J Mcdonough THIS PERSON | 19 | Daughter | Operator | Illinois |
| 30 | William Mcdonough | 18 | Son | — | Illinois |
| 31 | James H Mcdonough | 16 | Son | — | Illinois |
| 32 | Hugh J Mcdonough | 12 | Son | — | Illinois |
| 33 | Bessie Hummel | 35 | Sister in law | Operator | Illinois |
| 34 | Benjamin Brede | 40 | Head | Printer | Illinois |
| 35 | Ellen Brede | 37 | Wife | Milliner | Illinois |
| 36 | Jane Mcneil | 60 | Servant | House Maid | England |
| 37 | Mathew Reiner | 33 | Head | Bank Clerk | Illinois |
| 38 | Mildred Reiner | 31 | Wife | — | Illinois |
| 39 | Donald Reiner | 5 | Son | — | Illinois |
| 40 | Frank Fashingbauer | 60 | Head | Manager | Austria |
Related Census Records
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)