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.~1884), then head of a 10-person household.
Age 56
b. ~1884
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 | 56 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Naturalization Status | First papers filed |
| Additional Details | |
| Class of Worker | 0 |
| Highest Grade | No 2 |
| 1935 Residence | Same place |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
| Township / Ward | Detroit City |
| Est. Birth Year | ~1884 |
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 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Kozlowski | Daughter | — | 22 | ~1918 |
| Chester Zenter | Other | — | 40 | ~1900 |
| Ignacia Kozlowski | Head | — | 64 | ~1876 |
| Walter Kozlowski | Son | — | 20 | ~1920 |
| Edward Zenter | Other | — | 3 | ~1937 |
| Anna Kozlowski | Daughter | — | 27 | ~1913 |
| Richard Zenter | Other | — | 1 | ~1939 |
| Jean Zenter | Daughter | — | 26 | ~1914 |
| Anthony Kozlowski | Son | — | 30 | ~1910 |
| Mary Kozlowski | Spouse | — | 56 | ~1884 |
Census Appearances
1930
Wayne, Michigan
Spouse, age 46
Wayne, Michigan · implied b. ~1884 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlowska |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Poland |
| Naturalization Status | Alien |
| Year of Immigration | 1902 |
| Age at First Marriage | 20 |
| 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 56
Wayne-County, Michigan · implied b. ~1884 — 10 household members
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Naturalization Status | First papers filed |
| Class of Worker | 0 |
| Highest Grade | No 2 |
| 1935 Residence | Same place |
| 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 56 · b. ~1884 · 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-t0627-01878-00192)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frank Dziuba | 60 | Head | Undertaker | Poland |
| 2 | Anna Dziuba | 50 | Wife | — | Poland |
| 3 | John F. Dziuba | 31 | Son | Musical | Michigan |
| 4 | Stella Dziuba | 23 | Daughter | Receptionist | Michigan |
| 5 | Henry F. Dziuba | 22 | Son | — | Michigan |
| 6 | Stanley Dziuba | 19 | Son | — | Michigan |
| 7 | Virginia Dziuba | 16 | Daughter | — | Michigan |
| 8 | Frank Kovatch | 38 | Head | Electric Welder | Pennsylvania |
| 9 | Gizella Kovatch | 32 | Wife | — | Virginia |
| 10 | Albert Kovatch | 7 | Son | — | Michigan |
| 11 | Grace Kovatch | 3 | Daughter | — | Michigan |
| 12 | Joseph Presher | 35 | Head | Foreman | Michigan |
| 13 | Mary Presher | 28 | Wife | — | West Virginia |
| 14 | Mary Lou Presher | 1 | Daughter | — | Michigan |
| 15 | Walter Piotrowski | 58 | Head | Hot Furnace | Poland |
| 16 | Victoria Piotrowski | 57 | Wife | — | Poland |
| 17 | Olga Piotrowski | 19 | Daughter | Laborer | Michigan |
| 18 | Florence Piotrowski | 16 | Daughter | — | Michigan |
| 19 | Ignacia Kozlowski | 64 | Head | — | Poland |
| 20 | Mary Kozlowski THIS PERSON | 56 | Wife | — | Poland |
| 21 | Anthony Kozlowski | 30 | Son | Loader | Michigan |
| 22 | Anna Kozlowski | 27 | Daughter | Cake Wrapper | Michigan |
| 23 | Mary Kozlowski | 22 | Daughter | Cake Wrapper | Michigan |
| 24 | Walter Kozlowski | 20 | Son | Loader | Michigan |
| 25 | Chester Zenter | 40 | Son-in-law | Watchman | New York |
| 26 | Jean Zenter | 26 | Daughter | — | Michigan |
| 27 | Edward Zenter | 3 | Grandson | — | Michigan |
| 28 | Richard Zenter | 1 | Grandson | — | Michigan |
| 29 | Anthony Nyky | 50 | Head | Blacksmith | Poland |
| 30 | Isabelle Nyky | 51 | Wife | — | Poland |
| 31 | Anna Nyky | 25 | Daughter | — | Michigan |
| 32 | Genevieve Nyky | 21 | Daughter | Press Operator | Michigan |
| 33 | Anthony Jr. Nyky | 19 | Son | New Worker | Michigan |
| 34 | Tillie Nyky | 18 | Daughter | New Worker | Michigan |
| 35 | Edward Nyky | 15 | Son | — | Michigan |
| 36 | John Nyky | 10 | Son | — | Michigan |
| 37 | Sol R. Gawenka | 27 | Head | Scotting Machine | Michigan |
| 38 | Mary A. Gawenka | 26 | Wife | — | Michigan |
| 39 | Sebastian Costa | 24 | Head | Stock Chaser | Michigan |
| 40 | Rose P. Costa | 24 | Wife | — | Michigan |
Related Census Records
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)