MK
Mary Kozlowski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Wayne-County, Michigan
Our Model Tree links this Mary Kozlowski across the 1930 and 1940 US Censuses in Wayne-County, Michigan (XGBoost, ~Confirmed) — first a spouse (b.~1887), then head of a 7-person household.
Age 53
b. ~1887
Female
Spouse
Born: Poland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Wayne-County, Michigan |
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Naturalization Status | Alien |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 0 |
| 1935 Residence | Same house |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
| Township / Ward | Detroit City |
| Est. Birth Year | ~1887 |
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 |
|---|---|---|---|---|
| Arthur Kozlowski | Son | — | 28 | ~1912 |
| Edward Kozlowski | Son | — | 23 | ~1917 |
| Jenny Kozlowski | Daughter | — | 25 | ~1915 |
| Constantine Kozlowski | Head | — | 54 | ~1886 |
| Irene Kozlowski | Daughter | — | 21 | ~1919 |
| Felecia Kozlowski | Daughter | — | 19 | ~1921 |
| Mary Kozlowski | Spouse | — | 53 | ~1887 |
Census Appearances
1930
Wayne, Michigan
Spouse, age 42
Wayne, Michigan · implied b. ~1888 — 10 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | Poland |
| Naturalization Status | First papers filed |
| Year of Immigration | 1914 |
| Age at First Marriage | 22 |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| Mother Tongue | Polish |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
1940
Wayne-County, Michigan
Spouse, age 53
Wayne-County, Michigan · implied b. ~1887 — 7 household members
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | wife |
| Sex | F |
| Color / Race | White |
| Age | 53 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Naturalization Status | Alien |
| Class of Worker | 0 |
| Highest Grade | No 0 |
| 1935 Residence | Same house |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
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 Kozlowski across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Mary Kozlowski
Spouse · 1940 · age 53 · b. ~1887 · Michigan
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Wayne-County, Michigan
Open full size
1940 US Federal Census — Wayne-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01862-00025)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Irene Wasielewski | 18 | daughter | New Worker | Michigan |
| 2 | Edward Wasielewski | 17 | son | Laborer | Michigan |
| 3 | Robert Wasielewski | 15 | son | — | Michigan |
| 4 | John Sunyog | 28 | head | Park Maintenance | New York |
| 5 | Susan Sunyog | 20 | wife | — | Pennsylvania |
| 6 | Elenore Sunyog | 5 | daughter | — | Michigan |
| 7 | Robert Sunyog | 3 | son | — | Michigan |
| 8 | Charles Sunyog | 2 | son | — | Michigan |
| 9 | Clarence O'Brien | 40 | head | Press Operator | West Virginia |
| 10 | Emily O'Brien | 36 | wife | — | Michigan |
| 11 | Francis O'Brien | 12 | son | — | Michigan |
| 12 | John O'Brien | 9 | son | — | Michigan |
| 13 | Mary O'Brien | 7 | daughter | — | Michigan |
| 14 | Barbara O'Brien | 5 | daughter | — | Michigan |
| 15 | Constantine Kozlowski | 54 | head | Laborer | Poland |
| 16 | Mary Kozlowski THIS PERSON | 53 | wife | — | Poland |
| 17 | Arthur Kozlowski | 28 | son | Laborer | Michigan |
| 18 | Jenny Kozlowski | 25 | daughter | Domestic | Michigan |
| 19 | Edward Ab Kozlowski | 23 | son | Bottom Man | Michigan |
| 20 | Irene Kozlowski | 21 | daughter | Salesgirl | Michigan |
| 21 | Felecia Kozlowski | 19 | daughter | New Worker | Michigan |
| 22 | Anthony Rozdom | 64 | head | Watchman | Poland |
| 23 | Mary Rozdom | 56 | wife | — | Poland |
| 24 | Anthony Rozdom | 20 | son | New Worker | Missouri |
| 25 | Edward Rozdom | 17 | son | New Worker | Missouri |
| 26 | John Rozdom | 14 | son | — | Missouri |
| 27 | Teofilo Lebicki | 69 | head | — | Poland |
| 28 | Josephine Lebicki | 79 | wife | — | Poland |
| 29 | Irene Lutonski | 24 | head | — | Michigan |
| 30 | Bruno Lutonski | 3 | son | — | Michigan |
| 31 | Anna Lutonski | 43 | mother | Seamstress | Michigan |
| 32 | Boleslaw Bartusinski | 51 | head | Assembler | Poland |
| 33 | Julia Bartusinski | 60 | wife | — | Poland |
| 34 | Bronka Bartusinski | 23 | nephew | Trimmer | New Jersey |
| 35 | Helen Wysocki | 65 | head | — | Poland |
| 36 | Thomas Wysocki | 40 | son | Police Officer | New York |
| 37 | Regina Wysocki | 29 | daughter | Lettering | New York |
| 38 | Bernard Lewandowski | 34 | head | Time Keeper | Michigan |
| 39 | Irene Lewandowski | 34 | wife | — | New York |
| 40 | Irene Lewandowski | 14 | daughter | — | Michigan |
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)