MD
Mary Downey — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Downey across the 1930 and 1940 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1913), then head of a 7-person household.
Age 17
b. ~1913
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Downey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Additional Details | |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1913 |
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.
7 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Martin Dougherty | Other | — | 35 | ~1895 |
| Daniel Downey | Head | — | 50 | ~1880 |
| Frank Hagerty | Other | — | 30 | ~1900 |
| Daniel Downey | Son | — | 15 | ~1915 |
| James Downey | Son | — | 13 | ~1917 |
| Nellie Downey | Spouse | — | 50 | ~1880 |
| Mary Downey | Daughter | — | 17 | ~1913 |
Census Appearances
1930
Cook, Illinois
Daughter, age 17
Cook, Illinois · implied b. ~1913 — 7 household members
| Surname | Downey |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Illinois |
| 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
Daughter, age 26
Cook-County, Illinois · implied b. ~1914 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Downie |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Class of Worker | NP |
| Highest Grade | Hs 3 |
| 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 Downey across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Downey
Daughter · 1930 · age 17 · b. ~1913 · Illinois
★ You are viewing this record
Sibling
Daniel Downey
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Downey
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
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:illinoiscensus00reel460:0690)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Daniel Downey | 50 | Head | Pattern Maker | Illinois |
| 2 | Nellie Downey | 50 | Wife | Attendant | Illinois |
| 3 | Mary Downey THIS PERSON | 17 | Daughter | — | Illinois |
| 4 | Daniel Jr Downey | 15 | Son | — | Illinois |
| 5 | James Downey | 13 | Son | — | Illinois |
| 6 | Martin Dougherty | 35 | Roomer | Chauffeur | Illinois |
| 7 | Frank Hagerty | 30 | Roomer | Marble Setter | Illinois |
| 8 | Mary Mckeough | 59 | Head | Laundress | Illinois |
| 9 | Catherine Mckeough | 30 | Daughter | — | Illinois |
| 10 | Frederick Fintel | 59 | Roomer | Clerk | Germany |
| 11 | Richard Johnson | 30 | Head | Clerk | Illinois |
| 12 | Horace Page | 26 | Roomer | Machinist | Texas |
| 13 | Christian Schwartz | 53 | Head | Mechanic | Indiana |
| 14 | Mary Schwartz | 48 | Wife | — | Iowa |
| 15 | Mildred Cook | 23 | Daughter | — | Illinois |
| 16 | Robert Cook | 2 | Son | — | Illinois |
| 17 | — | None | — | — | — |
| 18 | Catherine Kearney | 51 | Head | — | Illinois |
| 19 | John J. Kearney | 59 | Brother | Teaming | Illinois |
| 20 | Joseph P. Kearney | 55 | Brother | Sales | Illinois |
| 21 | Ed J. Kearney | 45 | Brother | Chauffeur | Illinois |
| 22 | — | None | — | — | — |
| 23 | — | None | — | — | — |
| 24 | — | None | — | — | — |
| 25 | — | None | — | — | — |
| 26 | — | None | — | — | — |
| 27 | — | None | — | — | — |
| 28 | — | None | — | — | — |
| 29 | — | None | — | — | — |
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| 31 | — | None | — | — | — |
| 32 | — | None | — | — | — |
| 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)