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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 spouse (b.~1897), then head of a 4-person household.
Age 43
b. ~1897
Female
Spouse
Born: England
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | McDonnell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | H-2 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
| 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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Eileen Mcdonnell | Daughter | — | 15 | ~1925 |
| Michael Mcdonnell | Head | — | 45 | ~1895 |
| Willie Mcdonnell | Son | — | 19 | ~1921 |
| Mary Mcdonnell | Spouse | — | 43 | ~1897 |
Census Appearances
1930
Cook, Illinois
Spouse, age 34
Cook, Illinois · implied b. ~1896 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | McDonnell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 34 |
| Marital Status | Married |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1888 |
| Age at First Marriage | 20 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Cook-County, Illinois
Spouse, age 43
Cook-County, Illinois · implied b. ~1897 — 4 household members
| Surname | McDonnell |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Highest Grade | H-2 |
| 1935 Residence | Same place |
| Birth Country | England |
| Birthplace (normalized) | england |
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
Spouse · 1940 · age 43 · b. ~1897 · 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-t0627-00953-00239)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Hazel Shields | 24 | Daughter | Stenographer | Illinois |
| 2 | Edward Shields | 25 | Son | Cement Worker | Illinois |
| 3 | Michael Mcdonnell | 45 | Head | Freight Checker | England |
| 4 | Mary Mcdonnell THIS PERSON | 43 | Wife | — | England |
| 5 | Willie Mcdonnell | 19 | Son | Mail Order | England |
| 6 | Eileen Mcdonnell | 15 | Daughter | — | Illinois |
| 7 | Thomas Forkin | 50 | Head | Conductor | Irish Free State |
| 8 | Sarah Forkin | 47 | Wife | — | Irish Free State |
| 9 | Elizabeth Forkin | 23 | Daughter | — | Illinois |
| 10 | Winifred Forkin | 21 | Daughter | Gum Office | Illinois |
| 11 | Sarah Forkin | 18 | Daughter | — | Illinois |
| 12 | Thomas Forkin | 14 | Son | — | Illinois |
| 13 | Charles Morrison | 31 | Head | Chauf Mechanic | England |
| 14 | Ruth Morrison | 27 | Wife | — | Kentucky |
| 15 | Kathleen Morrison | 2 | Daughter | — | Illinois |
| 16 | James H. Fay | 60 | Head | Janitor | Illinois |
| 17 | Jennie Fay | 60 | Wife | — | Illinois |
| 18 | Martin Bernard | 67 | Boarder | — | Pennsylvania |
| 19 | Elmer Hogan | 35 | Head | Clerk | Illinois |
| 20 | Frances Hogan | 34 | Wife | — | Yugoslavia |
| 21 | Roger Hogan | 3 | Son | — | Illinois |
| 22 | Otto F. Hill | 47 | Head | Barber | Michigan |
| 23 | Jennie Hill | 43 | Wife | — | Finland |
| 24 | Joanne Hill | 11 | Daughter | — | Illinois |
| 25 | Alice Hill | 19 | Daughter | Saleslady | Illinois |
| 26 | Joseph Florek | 48 | Head | Cooper | Yugoslavia |
| 27 | Mary Florek | 45 | Wife | — | Yugoslavia |
| 28 | Marion Florek | 12 | Daughter | — | Illinois |
| 29 | May Luby | 52 | Head | Hostess | Illinois |
| 30 | Lawrence Luby | 25 | Son | Mail Clerk | Illinois |
| 31 | John Luby | 24 | Son | Packer | Illinois |
| 32 | Katherine Luby | 23 | Daughter | — | Illinois |
| 33 | Richard Luby | 21 | Son | Clerk-Sales | Illinois |
| 34 | Ann Timon | 55 | Lodger | Presser | Illinois |
| 35 | August Heiden | 58 | Head | Watchman | Illinois |
| 36 | Catherine Heiden | 44 | Wife | — | Illinois |
| 37 | Raymond Heiden | 15 | Son | — | Illinois |
| 38 | Thomas Reidy | 30 | Son in law | Chauffeur | Illinois |
| 39 | Florence Reidy | 30 | Daughter | — | Illinois |
| 40 | Helen G. Reidy | 7 | Grand daughter | — | 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)