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.~1905), then head of a 5-person household.
Age 35
b. ~1905
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 | 35 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Naturalization Status | Naturalized |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
| Township / Ward | Detroit City |
| Est. Birth Year | ~1905 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Eugene Kozlowski | Son | — | 10 | ~1930 |
| Mary Kozlowski | Spouse | — | 35 | ~1905 |
| Richard Kozlowski | Son | — | 2 | ~1938 |
| Rose Kozlowski | Daughter | — | 11 | ~1929 |
| John Kozlowski | Head | — | 31 | ~1909 |
Census Appearances
1930
Wayne, Michigan
Spouse, age 26
Wayne, Michigan · implied b. ~1904 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Poland |
| Naturalization Status | Naturalized |
| Year of Immigration | 1912 |
| Age at First Marriage | 24 |
| 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 35
Wayne-County, Michigan · implied b. ~1905 — 5 household members
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Detroit City |
| 1935 Residence (County) | Wayne |
| Naturalization Status | Naturalized |
| Income (1939) | 0 |
| Highest Grade | No 6 |
| 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 35 · b. ~1905 · 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-t0627-01846-00440)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Kozlowski | 31 | Head | Plater | Missouri |
| 42 | Mary Kozlowski THIS PERSON | 35 | Wife | — | Poland |
| 43 | Rose Marie Kozlowski | 11 | Daughter | — | Michigan |
| 44 | Eugene Kozlowski | 10 | Son | — | Michigan |
| 45 | Richard Kozlowski | 2 | Son | — | Michigan |
| 46 | Michael Berry | 36 | Head | Laborer | Michigan |
| 47 | Frances Berry | 34 | Wife | — | Michigan |
| 48 | Joseph Rysiewski | 30 | Lodger | Lather | Michigan |
| 49 | Frank Ditch | 29 | Lodger | Mechanic | Michigan |
| 50 | Paul Wraskwich | 49 | Head | Laborer | Poland |
| 51 | Alice Wraskwich | 50 | Wife | — | Poland |
| 52 | Anthony Wraskwich | 28 | Son | — | Poland |
| 53 | Paul Jr. Wraskwich | 11 | Son | — | Michigan |
| 54 | Ray Mazayko | 44 | Lodger | Laborer | Poland |
| 55 | John Bitzko | 59 | Lodger | — | Poland |
| 56 | Gus Johnson | 59 | Head | Janitor | Georgia |
| 57 | Carl Johnson | 20 | Son | Street Cleaner | Michigan |
| 58 | Susie Johnson | 18 | Daughter | — | Michigan |
| 59 | Gus Jr. Johnson | 16 | Son | — | Michigan |
| 60 | Clyde Turner | 35 | Head | Foundry | Georgia |
| 61 | Walter Bielski | 40 | Head | Laborer | Michigan |
| 62 | Lucila Bielski | 36 | Wife | — | Michigan |
| 63 | Gertrude Bielski | 13 | Daughter | — | Michigan |
| 64 | Wallace Bielski | 10 | Son | — | Michigan |
| 65 | Jerry Bielski | 7 | Son | — | Michigan |
| 66 | Joseph Zulkowski | 65 | Lodger | — | Poland |
| 67 | Robert Fair | 24 | Head | Lineman | South Carolina |
| 68 | Susie Fair | 28 | Wife | — | Tennessee |
| 69 | John Fair | 10 | Nephew | — | South Carolina |
| 70 | Charles Wilson | 28 | Lodger | Cleaner Barrel | Alabama |
| 71 | Anna Wilson | 22 | Lodger-Wife | — | Alabama |
| 72 | Thomas Zulkoski | 51 | Head | Watchman | Poland |
| 73 | Nellie Dawson | 48 | Head | — | Kentucky |
| 74 | Saul Dawson | 19 | Son | New Worker | Kentucky |
| 75 | Emmett Dawson | 17 | Son | — | Kentucky |
| 76 | Frank Dawson | 15 | Son | — | Michigan |
| 77 | Roberta Jennings | 22 | Daughter | Seamstress | Kentucky |
| 78 | Mary Harris | 9 | Granddaughter | — | Michigan |
| 79 | Lloyd Tault | 27 | Lodger | Checking Stock | Georgia |
| 80 | Frances Tault | 26 | Lodger-Wife | — | Kentucky |
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)