ML
Mary Leahy — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Leahy across the 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a spouse (b.~1882), then head of a 8-person household.
Age 48
b. ~1882
Female
Spouse
Born: Ireland
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1906 |
| Age at First Marriage | 24 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Additional Details | |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1882 |
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.
8 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Timothy Leahy | Son | — | 15 | ~1915 |
| Catherine Leahy | Daughter | — | 7 | ~1923 |
| Mary Leahy | Spouse | — | 48 | ~1882 |
| Dorothy Leahy | Daughter | — | 13 | ~1917 |
| Daniel Leahy | Son | — | 19 | ~1911 |
| Mary Leahy | Daughter | — | 9 | ~1921 |
| Margaret Leahy | Daughter | — | 11 | ~1919 |
| Daniel Leahy | Head | — | 50 | ~1880 |
Census Appearances
1930
Cook, Illinois
Spouse, age 48
Cook, Illinois · implied b. ~1882 — 8 household members
| Surname | Leahy |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 48 |
| Marital Status | Married |
| Birthplace | Ireland |
| Year of Immigration | 1906 |
| Age at First Marriage | 24 |
| Father's Birthplace | Ireland |
| Mother's Birthplace | Ireland |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Birth Country | Ireland |
| Birthplace (normalized) | ireland |
1940
Cook-County, Illinois
Spouse, age 59
Cook-County, Illinois · implied b. ~1881 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Leahy |
| Given Name | Margaret |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 59 |
| Marital Status | Married |
| Birthplace | Ireland |
| 1935 Residence (City) | Chicago |
| 1935 Residence (County) | Cook |
| Naturalization Status | Naturalized |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Ireland |
| Birthplace (normalized) | 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 Leahy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Leahy
Spouse · 1930 · age 48 · b. ~1882 · Illinois
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Cook, Illinois
Open full size
1930 US Federal Census — Cook, Illinois
Page Contents
50 people indexed on this census page (ia:1930:illinoiscensus00reel437:0773)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Evelyn Stagg | 25 | Daughter | — | Illinois |
| 2 | Ruth Stagg | 23 | Daughter | — | Illinois |
| 3 | Joseph Stagg | 55 | Head | Proprietor | Illinois |
| 4 | Barbara Stagg | 48 | Wife | Bookkeeper | Illinois |
| 5 | William B. Stagg | 22 | Son | — | Illinois |
| 6 | John Creamer | 42 | Head | Laborer | Illinois |
| 7 | Rose Creamer | 40 | Wife | — | Scotland |
| 8 | John Creamer | 13 | Son | — | Illinois |
| 9 | Ruth Creamer | 5 | Daughter | — | Illinois |
| 10 | Robert Creamer | 3 | Son | — | Illinois |
| 11 | Annie Scouller | 54 | Head | — | Scotland |
| 12 | Alex Scouller | 15 | Son | Messenger | Illinois |
| 13 | Alex Scouller | 13 | Son | — | Illinois |
| 14 | Annie Scouller | 12 | Daughter | — | Scotland |
| 15 | Martin Dougherty | 23 | Head | Janitor | Illinois |
| 16 | Florence Dougherty | 23 | Wife | — | Scotland |
| 17 | Martin Dougherty | 3 | Son | — | Illinois |
| 18 | Daniel M. Leahy | 50 | Head | Switchman | Ireland |
| 19 | Mary Leahy THIS PERSON | 48 | Wife | — | Ireland |
| 20 | Daniel Leahy | 19 | Son | Printer | Illinois |
| 21 | Timothy Leahy | 15 | Son | Helper | Illinois |
| 22 | Dorothy Leahy | 13 | Daughter | — | Illinois |
| 23 | Margaret Leahy | 11 | Daughter | — | Illinois |
| 24 | Mary Leahy | 9 | Daughter | — | Illinois |
| 25 | Catherine Leahy | 7 | Daughter | — | Illinois |
| 26 | — | None | — | — | — |
| 27 | James Taylor | 28 | Head | — | Illinois |
| 28 | Anna Taylor | 21 | Wife | Maid | Ireland |
| 29 | Mary Downes | 42 | Head | — | Ireland |
| 30 | Mary Downes | 12 | Daughter | — | Illinois |
| 31 | Margaret Downes | 9 | Daughter | — | Illinois |
| 32 | Thomas Downes | 7 | Son | — | Illinois |
| 33 | — | None | — | — | — |
| 34 | — | None | — | — | — |
| 35 | — | None | — | — | — |
| 36 | — | None | — | — | — |
| 37 | — | None | — | — | — |
| 38 | — | None | — | — | — |
| 39 | — | None | — | — | — |
| 40 | — | None | — | — | — |
| 41 | — | None | — | — | — |
| 42 | — | None | — | — | — |
| 43 | — | None | — | — | — |
| 44 | — | None | — | — | — |
| 45 | — | None | — | — | — |
| 46 | — | None | — | — | — |
| 47 | — | None | — | — | — |
| 48 | — | None | — | — | — |
| 49 | — | None | — | — | — |
| 50 | — | None | — | — | — |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)