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Mary Mcdonnell — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Mcdonnell across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1885), then head of a 6-person household.
Age 55
b. ~1885
Female
Head
Born: Northern Ireland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McDonnell |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Widowed |
| Birthplace | Northern Ireland |
| 1935 Residence (City) | CHICAGO |
| 1935 Residence (County) | COOK |
| Naturalization Status | Naturalized |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same House |
| Birthplace (normalized) | northern ireland |
| Township / Ward | Chicago |
| Est. Birth Year | ~1885 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Thomas Mcdonnell | Son | — | 18 | ~1922 |
| Edward Mcdonnell | Son | — | 11 | ~1929 |
| Mary Mcdonnell | Daughter | — | 19 | ~1921 |
| Margot Mcdonnell | Daughter | — | 14 | ~1926 |
| Isibel Mcdonnell | Daughter | — | 22 | ~1918 |
| Mary Mcdonnell | Head | — | 55 | ~1885 |
Census Appearances
1930
Cook, Illinois
Other, age 45
Cook, Illinois · implied b. ~1885 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonnell |
| Given Name | Mary A |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 45 |
| Marital Status | Married |
| Birthplace | Northern Ireland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1908 |
| Age at First Marriage | 27 |
| Father's Birthplace | Northern Ireland |
| Mother's Birthplace | Northern Ireland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birthplace (normalized) | northern ireland |
1940
Cook-County, Illinois
Head, age 55
Cook-County, Illinois · implied b. ~1885 — 6 household members
| Surname | McDonnell |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 55 |
| Marital Status | Widowed |
| Birthplace | Northern Ireland |
| 1935 Residence (City) | CHICAGO |
| 1935 Residence (County) | COOK |
| Naturalization Status | Naturalized |
| Hours Worked | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same House |
| Birthplace (normalized) | northern ireland |
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 Mcdonnell across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Mcdonnell
Head · 1940 · age 55 · b. ~1885 · 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-t0627-00957-00538)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Lillian Muscato | 16 | Daughter | — | Illinois |
| 42 | Dolores Muscato | 12 | Daughter | — | Illinois |
| 43 | Wong Young | 57 | Head | Night Watchman | California |
| 44 | Anna Young | 42 | Wife | Housework | Austria |
| 45 | Chester Young | 19 | Son | Ccc Camp | Illinois |
| 46 | William Young | 17 | Son | — | Illinois |
| 47 | Martha Young | 15 | Daughter | — | Illinois |
| 48 | Eli Vargo | 47 | Head | Coupling Threader | Austria |
| 49 | Helen Vargo | 34 | Wife | — | Ohio |
| 50 | Louis Eli Vargo | 8 | Son | — | Illinois |
| 51 | Rosemary Vargo | 6 | Daughter | — | Illinois |
| 52 | Martha Frances Vargo | 4 | Daughter | — | Illinois |
| 53 | Andrew Brown | 58 | Lodger | Pipe Cutter | Lithuania |
| 54 | Duge Kurir | 71 | Head | Laborer Bldg Construction | Yugo-Slavia |
| 55 | Frances Kurir | 63 | Wife | — | Yugo-Slavia |
| 56 | Anthony Kurir | 28 | Son | Shipping Clerk | Illinois |
| 57 | Marian Kurir | 23 | Daughter | Order Clerk | Illinois |
| 58 | Arthur Laviolette | 45 | Head | Hoisting Eng. Portable Engineer | Illinois |
| 59 | Edna Laviolette | 43 | Wife | — | Illinois |
| 60 | Robert Laviolette | 4 | Son | — | Illinois |
| 61 | Antonio Gerceo | 71 | Head | — | Italy |
| 62 | Theresa Gerceo | 71 | Wife | — | Italy |
| 63 | Michael Gerceo | 37 | Son | Salesman Clothing Mfg. | Illinois |
| 64 | Alice Gerceo | 23 | Daughter-in-law | — | Illinois |
| 65 | Mary Mcdonnell THIS PERSON | 55 | Head | — | Northern Ireland |
| 66 | Isibel Mcdonnell | 22 | Daughter | Telephone Operator | Illinois |
| 67 | Mary Mcdonnell | 19 | Daughter | Retail Salesgirl Notion Store | Illinois |
| 68 | Thomas Mcdonnell | 18 | Son | Press Operator | Illinois |
| 69 | Margot Mcdonnell | 14 | Daughter | — | Illinois |
| 70 | Edward Mcdonnell | 11 | Son | — | Illinois |
| 71 | Joseph Giustino | 37 | Head | Hammersmith Drop Forge | Italy |
| 72 | Gertrude Giustino | 31 | Wife | — | Michigan |
| 73 | Shirley Giustino | 14 | Daughter | — | Illinois |
| 74 | Rocco Giustino | 9 | Son | — | Illinois |
| 75 | Angelo Campanelli | 70 | Lodger | — | Italy |
| 76 | Edward B. Mchugh | 44 | Head | Elevated Railroad Training | Eire |
| 77 | May Mchugh | 34 | Wife | — | Illinois |
| 78 | Edward Mchugh | 12 | Son | — | Illinois |
| 79 | Patricia Mchugh | 10 | Daughter | — | Illinois |
| 80 | Daniel Mchugh | 7 | Son | — | Illinois |
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)