MH
Mary Healy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Healy across the 1920, 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a head (b.~1877), then head of a 2-person household.
Age 63
b. ~1877
Female
Head
Born: Illinois
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Healy |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 63 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Industry | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same House |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1877 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Healy | Head | — | 63 | ~1877 |
| James Healy | Son | — | 21 | ~1919 |
Census Appearances
1920
Cook, Illinois
Spouse, age 42
Cook, Illinois · implied b. ~1878 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Healey |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Illinois |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Other, age 52
Cook, Illinois · implied b. ~1878 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Healey |
| Given Name | Mary A. |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 20 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Maine |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Head, age 63
Cook-County, Illinois · implied b. ~1877 — 2 household members
| Surname | Healy |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 63 |
| Marital Status | Widowed |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago city |
| 1935 Residence (County) | Cook |
| Industry | 0 |
| Highest Grade | 8 |
| 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 Healy across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Healy
Head · 1940 · age 63 · b. ~1877 · 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-t0627-00954-00875)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Theodore Frost | 29 | Head | Truck Driver | Minnesota |
| 2 | Cecile Frost | 25 | Wife | — | Illinois |
| 3 | Herman Peterson | 51 | Head | — | Illinois |
| 4 | Marie Peterson | 43 | Wife | Laundry | Denmark |
| 5 | Burdette Peterson | 23 | Son | Civil Engineer | Iowa |
| 6 | Vernon Peterson | 21 | Son | Mail Clerk | Iowa |
| 7 | Naomi Peterson | 19 | Daughter | Clerk | Iowa |
| 8 | Arlene Peterson | 17 | Daughter | — | Iowa |
| 9 | Richard Peterson | 14 | Son | — | Iowa |
| 10 | Peter Karpis | 35 | Head | Automobile Mechanic | Illinois |
| 11 | Berta Karpis | 33 | Wife | — | Illinois |
| 12 | Joan Karpis | 9 | Daughter | — | Illinois |
| 13 | Carl Gertz | 35 | Head | Machinist | Illinois |
| 14 | Bernice Gertz | 30 | Wife | Biller Clerk | Illinois |
| 15 | Carl Peter Gertz | 0 | Son | — | Illinois |
| 16 | Mary Healy THIS PERSON | 63 | Head | — | Illinois |
| 17 | James Healy | 21 | Son | New Worker | Illinois |
| 18 | Philemon Sprungli | 51 | Head | Dispatching Clerk | Indiana |
| 19 | Helena Sprungli | 46 | Wife | — | Kansas |
| 20 | Albert Daly | 42 | Head | Car Mechanic | Illinois |
| 21 | Mary E. Daly | 42 | Wife | — | Illinois |
| 22 | Marie T. Daly | 14 | Daughter | — | Illinois |
| 23 | John A. Daly | 9 | Son | — | Illinois |
| 24 | Margaret Daly | 7 | Daughter | — | Illinois |
| 25 | Joseph Destefano | 44 | Head | Laborer | Italy |
| 26 | Blacha Destefano | 57 | Wife | — | Italy |
| 27 | Agnes Destefano | 21 | Daughter | Machine Operator | Illinois |
| 28 | Mildred Destefano | 18 | Daughter | Packer | Illinois |
| 29 | Anthony Pecora | 52 | Head | Construction | Italy |
| 30 | Josephine Pecora | 52 | Wife | — | Italy |
| 31 | Elsie Pecora | 20 | Niece | Inspector | Illinois |
| 32 | Alexander Simkus | 56 | Head | Ham Boner | Lithuania |
| 33 | Katherine Simkus | 50 | Wife | — | Lithuania |
| 34 | John Simkus | 25 | Head | Manager | Illinois |
| 35 | Vivian Simkus | 22 | Wife | — | Iowa |
| 36 | Sandra Simkus | 1 | Daughter | — | Illinois |
| 37 | Anna Finnegan | 61 | Head | — | Illinois |
| 38 | Ethel Duggan | 37 | Daughter | Mail Clerk | Illinois |
| 39 | Irene Duggan | 17 | Daughter | — | Illinois |
| 40 | Walter Smolenski | 46 | Head | Furniture Repairman | Poland |
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)