MT
Mary Tracy — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cook-County, Illinois
Our Model Tree links this Mary Tracy across the 1930 and 1940 US Censuses in Cook-County, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1901), then head of a 7-person household.
Age 39
b. ~1901
Female
Daughter
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cook-County, Illinois |
| Surname | Tracy |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| Additional Details | |
| Highest Grade | 8 |
| 1935 Residence | Same house |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Township / Ward | Chicago City |
| Est. Birth Year | ~1901 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| James Ryan | Head | — | 46 | ~1894 |
| Mary Ryan | Daughter | — | 24 | ~1916 |
| Mary Tracy | Daughter | — | 39 | ~1901 |
| Marie Ryan | Spouse | — | 43 | ~1897 |
| Margaret Ryan | Daughter | — | 16 | ~1924 |
| James Ryan | Son | — | 19 | ~1921 |
| Catherine Ryan | Daughter | — | 13 | ~1927 |
Census Appearances
1930
Cook, Illinois
Other, age 28
Cook, Illinois · implied b. ~1902 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Tracey |
| Given Name | Margaret |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Illinois |
| Age at First Marriage | 21 |
| Father's Birthplace | United States |
| Mother's Birthplace | Germany |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Cook-County, Illinois
Daughter, age 39
Cook-County, Illinois · implied b. ~1901 — 7 household members
| Surname | Tracy |
| Given Name | Mary E. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Chicago City |
| 1935 Residence (County) | Cook |
| 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 Tracy across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Tracy
Daughter · 1940 · age 39 · b. ~1901 · Illinois
★ You are viewing this record
Sibling
Margaret Ryan
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Ryan
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Ryan
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Ryan
Sibling · 1940 · 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
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-t0627-00977-00146)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Kucha | 38 | Head | Sprayer | Illinois |
| 42 | Mary Kucha | 36 | Wife | — | Illinois |
| 43 | Stanley Kucha | 10 | Son | — | Illinois |
| 44 | Loretta Kucha | 3 | Daughter | — | Illinois |
| 45 | John Gajerba | 50 | Head | Labor Factory | Poland |
| 46 | Antoinette Gajerba | 47 | Wife | — | Poland |
| 47 | Mary Gajerba | 26 | Daughter | Washer | Poland |
| 48 | Steve Gajerba | 20 | Son | Laborer | Illinois |
| 49 | Diane Gajerba | 18 | Daughter | Washer | Illinois |
| 50 | Agnes Rucha | 48 | Head | Waitress | Poland |
| 51 | Stanley Rucha | 25 | Son | Sprayer | Illinois |
| 52 | Lottie Rucha | 23 | Daughter | New Worker | Illinois |
| 53 | Bruno Rucha | 22 | Son | — | Illinois |
| 54 | Mike Tryba | 56 | Head | Frame Maker | Poland |
| 55 | Sophie Tryba | 46 | Wife | Housework | Poland |
| 56 | Mitchell Tryba | 19 | Son | Frame Maker | Illinois |
| 57 | Walter Tryba | 17 | Son | Trucker | Illinois |
| 58 | Nellie Tryba | 16 | Daughter | — | Illinois |
| 59 | Bruno Tryba | 15 | Son | — | Illinois |
| 60 | Mary O'Brien | 59 | Head | — | Illinois |
| 61 | Keith Ella O'Brien | 80 | Mother | — | Illinois |
| 62 | Alex Swartz | 24 | Head | Elevator Operator | Illinois |
| 63 | Stella Swartz | 23 | Wife | Saleslady | Illinois |
| 64 | Margerette Swartz | 1 | Daughter | — | Illinois |
| 65 | Joseph Kasperski | 51 | Head | Box Maker | Poland |
| 66 | Julia Kasperski | 50 | Wife | — | Poland |
| 67 | John Kasperski | 21 | Son | Operator | Illinois |
| 68 | Evelyn Kasperski | 17 | Daughter | House Servant | Illinois |
| 69 | Irene Kasperski | 14 | Daughter | — | Illinois |
| 70 | John Jegarski | 45 | Lodger | Sausage Maker | Russia |
| 71 | James Ryan | 46 | Head | Bartender | Illinois |
| 72 | Marie Ryan | 43 | Wife | — | Illinois |
| 73 | Mary Ryan | 24 | Daughter | Stenographer | Illinois |
| 74 | James Ryan | 19 | Son | Bookkeeping | Illinois |
| 75 | Margaret Ryan | 16 | Daughter | — | Illinois |
| 76 | Catherine Ryan | 13 | Daughter | — | Illinois |
| 77 | Mary E. Tracy THIS PERSON | 39 | Daughter | — | Illinois |
| 78 | Jacob Kopala | 50 | Head | Tanner Dicker | Poland |
| 79 | Victoria Kopala | 49 | Wife | — | Poland |
| 80 | Walter Kopala | 28 | Son | Truck Driver | 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)