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Margaret Mahoney — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Margaret Mahoney across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1897), then head of a 5-person household.
Age 43
b. ~1897
Female
Spouse
Born: Illinois
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Mahoney |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Occupation | 0 |
| Industry | 0 |
| Class of Worker | 0 |
| Highest Grade | H 2 |
| 1935 Residence | Same Place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | 0 |
| Township / Ward | Chicago |
| Est. Birth Year | ~1897 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Margaret | Age | Birth yr |
|---|---|---|---|---|
| Patricia Mahoney | Daughter | — | 13 | ~1927 |
| John Carran | Other | — | 46 | ~1894 |
| Thos Mahoney | Son | — | 15 | ~1925 |
| Thos Mahoney | Head | — | 46 | ~1894 |
| Margaret Mahoney | Spouse | — | 43 | ~1897 |
Census Appearances
1920
Cook, Illinois
Spouse, age 23
Cook, Illinois · implied b. ~1897 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 23 |
| Marital Status | Married |
| 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 |
Spouse, age 33
Cook, Illinois · implied b. ~1897 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mahoney |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 33 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 20 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Spouse, age 43
Cook-County, Illinois · implied b. ~1897 — 5 household members
| Surname | Mahoney |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Occupation | 0 |
| Industry | 0 |
| Class of Worker | 0 |
| Highest Grade | H 2 |
| 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 Margaret Mahoney across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Margaret Mahoney
Spouse · 1940 · age 43 · b. ~1897 · 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-t0627-00955-00621)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Audrey Carr | 9 | Daughter | — | Illinois |
| 2 | James Carr | 4 | Son | — | Illinois |
| 3 | Thos. F Mahoney | 46 | Head | Yard Foreman | Irish Free State |
| 4 | Margaret Mahoney THIS PERSON | 43 | Wife | 0 | Illinois |
| 5 | Thos. Jr Mahoney | 15 | Son | — | Illinois |
| 6 | Patricia Mahoney | 13 | Daughter | — | Illinois |
| 7 | John Carran | 46 | Boarder | Truck Driver | Illinois |
| 8 | Ray Younglaughery | 26 | Head | Metallurgical Engineer | Illinois |
| 9 | Mildred Younglaughery | 48 | Mother | 0 | Illinois |
| 10 | Albert Hobbs | 63 | Lodger | Steamfitter | Canada-English |
| 11 | Margaret Mcdonnell | 35 | Head | 0 | Irish Free State |
| 12 | James Mcdonnell | 14 | Son | Optician | Illinois |
| 13 | Barry Mcdonnell | None | Alice | — | S 8 |
| 14 | Winifred Shegg | 69 | Head | 0 | Illinois |
| 15 | Mary R. Shegg | 62 | Sister | 0 | Illinois |
| 16 | Haley H. Mcdonald | 72 | Head | Building Contractor | Iowa |
| 17 | Marie V. Mcdonald | 64 | Wife | 0 | New York |
| 18 | James Mcgreery | 65 | Head | Elevator Starter | Northern Ireland |
| 19 | Albert Bailey | 45 | Son-in-law | Machinist | Illinois |
| 20 | Margaret Bailey | 39 | Daughter | 0 | Illinois |
| 21 | Rosemary Bailey | 12 | Granddaughter | — | Illinois |
| 22 | Josephine Bower | 75 | Head | Salesman | Pennsylvania |
| 23 | Lillian Bower | 66 | Wife | 0 | Pennsylvania |
| 24 | Harry Maher | 29 | Head | — | Illinois |
| 25 | Elizabeth Maher | 27 | Wife | 0 | Illinois |
| 26 | William Kaiser | 36 | Head | Broker | Illinois |
| 27 | Stella Kaiser | 34 | Wife | 0 | Illinois |
| 28 | Joan Kaiser | 1 | Daughter | — | Illinois |
| 29 | James Cummings | 71 | Head | Cattle Buyer | Illinois |
| 30 | Anna Cummings | 68 | Wife | 0 | Illinois |
| 31 | Oliver C. Bacon | 39 | Head | Appraiser | Mass. |
| 32 | Anna F Bacon | 42 | Wife | Clerk | Illinois |
| 33 | Josephine Ballala | 38 | Sister-in-law | Clerk | Illinois |
| 34 | Harry Clene | 36 | Head | Optician | Iowa |
| 35 | Grace Clene | 32 | Wife | 0 | Illinois |
| 36 | Raymond Kaufmann | 40 | Head | Salesman | Illinois |
| 37 | Marguerite Kaufmann | 41 | Wife | 0 | Illinois |
| 38 | Marjorie Kaufmann | 19 | Daughter | 0 | Illinois |
| 39 | William Kelch | 32 | Head | Ticket Seller | Illinois |
| 40 | Marjorie Kelch | 25 | Wife | Stenographer | Illinois |
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)