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Mary Mcgrath — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Mcgrath across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1899), then head of a 11-person household.
Age 41
b. ~1899
Female
Spouse
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | Housewife |
| Class of Worker | PW |
| Hours Worked | 5 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Housewife |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1899 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Dolores Mcgrath | Daughter | — | 18 | ~1922 |
| Myrtle Mcgrath | Daughter | — | 11 | ~1929 |
| Francis Mcgrath | Daughter | — | 13 | ~1927 |
| Mary Mcgrath | Daughter | — | 22 | ~1918 |
| Arthur Mcgrath | Head | — | 47 | ~1893 |
| Donald Mcgrath | Son | — | 16 | ~1924 |
| John Mcgrath | Son | — | 10 | ~1930 |
| Robert Mcgrath | Son | — | 10 | ~1930 |
| Thomas Mcgrath | Son | — | 8 | ~1932 |
| Arthur Mcgrath | Son | — | 21 | ~1919 |
| Mary Mcgrath | Spouse | — | 41 | ~1899 |
Census Appearances
1930
Cook, Illinois
Other, age 30
Cook, Illinois · implied b. ~1900 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McGrath |
| Given Name | Margaret |
| Relationship to Head | sister |
| Sex | F |
| Color / Race | White |
| Age | 30 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | South Ireland |
| Mother's Birthplace | South Ireland |
| Occupation | supervisor |
| Industry | telephone company |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Spouse, age 41
Cook-County, Illinois · implied b. ~1899 — 11 household members
| Surname | McGrath |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Occupation | Housewife |
| Class of Worker | PW |
| Hours Worked | 5 |
| Income (1939) | 0 |
| 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 Mcgrath across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Mcgrath
Spouse · 1940 · age 41 · b. ~1899 · Illinois
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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-t0627-00960-00123)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Arnold Sanche | 38 | Head | Proprietor | Illinois |
| 42 | Marie Sanche | 40 | Wife | Housewife | Illinois |
| 43 | Jeanne Sanche | 14 | Daughter | — | Illinois |
| 44 | Eleanor Sanche | 12 | Daughter | — | Illinois |
| 45 | Mary Sanche | 9 | Daughter | — | Illinois |
| 46 | Thomas R Smith | 35 | Head | Electrician | Illinois |
| 47 | Julia Smith | 33 | Wife | Housewife | Missouri |
| 48 | Thomas Jr Smith | 10 | Son | — | Illinois |
| 49 | Robert Peter Smith | 7 | Son | — | Illinois |
| 50 | Michael Jenniches | 38 | Head | Maintenance | Illinois |
| 51 | Ella Jenniches | 34 | Wife | Housewife | Illinois |
| 52 | Elizabeth Jenniches | 4 | Daughter | — | Illinois |
| 53 | Carl Jensen | 47 | Head | Painter | Denmark |
| 54 | Clara Jensen | 48 | Wife | Housewife | Denmark |
| 55 | Eckhardt Hoffman | 53 | Head | Supervisor | Illinois |
| 56 | Frances Hoffman | 50 | Wife | Housewife | Illinois |
| 57 | Charles Hoffman | 22 | Son | Helper | Illinois |
| 58 | John Quigley | 60 | Head | Chief Clerk | Illinois |
| 59 | Nell Quigley | 55 | Wife | Housewife | Illinois |
| 60 | Thomas Quigley | 28 | Son | Truck Driver | Illinois |
| 61 | Olof A Faderberg | 51 | Head | Carpenter | Sweden |
| 62 | Gerda Faderberg | 48 | Wife | Housewife | Sweden |
| 63 | Helga Faderberg | 20 | Daughter | Typist | Sweden |
| 64 | Arthur Mcgrath | 47 | Head | Appraiser | Illinois |
| 65 | Mary Mcgrath THIS PERSON | 41 | Wife | Housewife | Illinois |
| 66 | Mary Mcgrath | 22 | Daughter | New Worker | Illinois |
| 67 | Arthur Jr Mcgrath | 21 | Son | New Worker | Illinois |
| 68 | Dolores Mcgrath | 18 | Daughter | — | Illinois |
| 69 | Donald Mcgrath | 16 | Son | — | Illinois |
| 70 | Francis Mcgrath | 13 | Daughter | — | Illinois |
| 71 | Robert Mcgrath | 10 | Son | — | Illinois |
| 72 | Myrtle Mcgrath | 11 | Daughter | — | Illinois |
| 73 | John Mcgrath | 10 | Son | — | Illinois |
| 74 | Thomas Mcgrath | 8 | Son | — | Illinois |
| 75 | Edwin Friedholdt | 40 | Head | Mechanic | Iowa |
| 76 | Mildred Friedholdt | 35 | Wife | Housewife | Illinois |
| 77 | Alexander Donegall | 50 | Head | Civil Engineer | Illinois |
| 78 | Emma Donegall | 47 | Wife | Housewife | Illinois |
| 79 | Stanley Donegall | 38 | Brother | Accountant | Illinois |
| 80 | Hardcastle Eaton | 64 | Head | Cooper | Virginia |
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)