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Mary Kowalski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Cook, Illinois
Our Model Tree links this Mary Kowalski across the 1920 and 1930 US Censuses in Cook, Illinois (XGBoost, ~Confirmed) — first a daughter (b.~1912), then head of a 10-person household.
Age 18
b. ~1912
Female
Daughter
Born: Illinois
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Cook, Illinois |
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Occupation | Coil winder |
| Industry | Telephone factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Coil Winder |
| Township / Ward | Cicero Town |
| Est. Birth Year | ~1912 |
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.
10 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Rose Kowalski | Daughter | — | 10 | ~1920 |
| Alice Kowalski | Daughter | — | 12 | ~1918 |
| Sophie Kowalski | Daughter | — | 20 | ~1910 |
| Genevieve Kowalski | Daughter | — | 8 | ~1922 |
| Anastasia Kowalski | Spouse | — | 42 | ~1888 |
| Mary Kowalski | Daughter | — | 18 | ~1912 |
| Henry Kowalski | Son | — | 14 | ~1916 |
| Joseph Kowalski | Head | — | 44 | ~1886 |
| Irene Kowalski | Daughter | — | 16 | ~1914 |
| Cecelia Kowalski | Daughter | — | 3 | ~1927 |
Census Appearances
1920
Cook, Illinois
Daughter, age 7
Cook, Illinois · implied b. ~1913 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Cook, Illinois
Daughter, age 18
Cook, Illinois · implied b. ~1912 — 10 household members
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Coil winder |
| Industry | Telephone factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 Kowalski across 2 US Census years (1920 and 1930) in Cook, Illinois, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Kowalski
Daughter · 1930 · age 18 · b. ~1912 · Illinois
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Sibling
Sophie Kowalski
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henry Kowalski
Sibling · 1930 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alice Kowalski
Sibling · 1930 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Cecelia Kowalski
Sibling · 1930 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rose Kowalski
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene Kowalski
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Genevieve Kowalski
Sibling · 1930 · age 8
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:illinoiscensus00reel498:0911)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Josephine Michalkiewicz | 26 | Daughter | Coil Winder | Illinois |
| 52 | Matthew Michalkiewicz | 16 | Son | — | Illinois |
| 53 | Chester Michalkiewicz | 14 | Son | — | Illinois |
| 54 | Joseph Grisko | 38 | Head | Chain Maker | Illinois |
| 55 | Julia Grisko | 34 | Wife | Coil Winder | Illinois |
| 56 | Arthur Grisko | 10 | Son | — | Illinois |
| 57 | Gladys Grisko | 5 | Daughter | — | Illinois |
| 58 | Anton Glysinski | 70 | Head | Laborer | Poland |
| 59 | Johanna Glysinski | 69 | Wife | — | Poland |
| 60 | Frank Barrett | 31 | Head | Chauffeur | Illinois |
| 61 | Stella Barrett | 32 | Wife | Assembler | Illinois |
| 62 | Luke Crankowicz | 44 | Head | Painter | Czecho-Slovakia |
| 63 | Josephine Crankowicz | 38 | Wife | — | Yugo-Slavia |
| 64 | Edward Crankowicz | 13 | Son | — | Illinois |
| 65 | Joseph Crankowicz | 12 | Son | — | Illinois |
| 66 | Sigmund Wojciechowski | 32 | Head | Supervisor | Illinois |
| 67 | Sally Wojciechowski | 27 | Wife | — | Poland |
| 68 | Clara Wojciechowski | 7 | Daughter | — | Illinois |
| 69 | Sophia Bogacz | 58 | Mother-in-law | — | Poland |
| 70 | Joseph Kowalski | 44 | Head | Cooper | Poland |
| 71 | Anastasia Kowalski | 42 | Wife | — | Poland |
| 72 | Sophie Kowalski | 20 | Daughter | Servant | Poland |
| 73 | Mary Kowalski THIS PERSON | 18 | Daughter | Coil Winder | Illinois |
| 74 | Irene Kowalski | 16 | Daughter | — | Illinois |
| 75 | Henry Kowalski | 14 | Son | — | Illinois |
| 76 | Alice Kowalski | 12 | Daughter | — | Illinois |
| 77 | Rose Kowalski | 10 | Daughter | — | Illinois |
| 78 | Genevieve Kowalski | 8 | Daughter | — | Illinois |
| 79 | Cecelia Kowalski | 3 | Daughter | — | Illinois |
| 80 | Walter Glogowski | 30 | Head | Bookkeeper | Illinois |
| 81 | Estelle Glogowski | 22 | Wife | File Clerk | Illinois |
| 82 | Adolph Mlyner | 50 | Head | Driver | Aust-Austria |
| 83 | Genevieve Mlyner | 24 | Daughter | — | Illinois |
| 84 | Phyllis Mlyner | 16 | Daughter | — | Illinois |
| 85 | Lucille Mlyner | 14 | Daughter | — | Illinois |
| 86 | Milton Mlyner | 12 | Son | — | Illinois |
| 87 | Zita Mlyner | 10 | Daughter | — | Illinois |
| 88 | Tom Jurk | 46 | Head | Car Repairer | Poland |
| 89 | Mary Jurk | 40 | Wife | — | Poland |
| 90 | Walter Jurk | 19 | Son | Apprentice Ironman | Illinois |
| 91 | Isabelle Jurk | 17 | Daughter | Stenographer | Illinois |
| 92 | Albin Jurk | 9 | Son | — | Illinois |
| 93 | Marion Jurk | 2 | Daughter | — | Illinois |
| 94 | Caroline Du Quesne | 70 | Head | — | France |
| 95 | Margaret Boyle | 18 | Daughter | File Clerk | Illinois |
| 96 | Jeanette Boyle | 17 | Daughter | Assembler | Illinois |
| 97 | Joseph Pulaski | 37 | Head | Coil Winder | Poland |
| 98 | Katherine Pulaski | 36 | Wife | — | Poland |
| 99 | Lillian Pulaski | 11 | Daughter | — | Illinois |
| 100 | Michael Luch | 57 | Head | Carpenter | Poland |
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)