MK
Mary Kozlowski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Mary Kozlowski across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a spouse (b.~1897), then head of a 8-person household.
Age 43
b. ~1897
Female
Spouse
Born: Poland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | PHILADELPHIA |
| Naturalization Status | Naturalized |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same House |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1897 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Benidict Stupalis | Other | — | 49 | ~1891 |
| Mary Kozlowski | Spouse | — | 43 | ~1897 |
| Helen Kozlowski | Daughter | — | 16 | ~1924 |
| Joseph Kozlowski | Head | — | 55 | ~1885 |
| Philip Stankies | Other | — | 52 | ~1888 |
| Stella Anderson | Other | — | 33 | ~1907 |
| Adele Kozlowski | Daughter | — | 14 | ~1926 |
| Walbrina Kozlowski | Son | — | 20 | ~1920 |
Census Appearances
1930
Philadelphia, Pennsylvania
Other, age 32
Philadelphia, Pennsylvania · implied b. ~1898 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife-H |
| Sex | F |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | Poland |
| Naturalization Status | Alien |
| Year of Immigration | 1904 |
| 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
Philadelphia-County, Pennsylvania
Spouse, age 43
Philadelphia-County, Pennsylvania · implied b. ~1897 — 8 household members
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 43 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | PHILADELPHIA |
| Naturalization Status | Naturalized |
| Highest Grade | No 8 |
| 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 43 · b. ~1897 · Pennsylvania
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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 — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03693-00296)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | George Willas | 56 | Head | Proprietor | Lithuania |
| 2 | Anna Willas | 46 | Wife | Cook | Lithuania |
| 3 | Albert Willas | 18 | Son | — | Penna. |
| 4 | John Zetkins | 24 | Step son | Machinist | Penna. |
| 5 | Joseph Aukstuolis | 52 | Lodger | Porter | Lithuania |
| 6 | Adolph Wallete | 45 | Head | Baster | Lithuania |
| 7 | Helen Wallete | 47 | Wife | — | Penna. |
| 8 | Joseph Ulevich | 54 | Lodger | Soler | Lithuania |
| 9 | Joseph Daniels | 43 | Lodger | Paper Hanger | Lithuania |
| 10 | James Cassidy | 57 | Head | Enumerator | Penna. |
| 11 | Cecilla Cassidy | 57 | Wife | — | Penna. |
| 12 | Joseph Kozlowski | 55 | Head | Baker'S Helper | Lithuania |
| 13 | Mary Kozlowski THIS PERSON | 43 | Wife | — | Poland |
| 14 | Walbrina Kozlowski | 20 | Son | Typist | Penna. |
| 15 | Helen Kozlowski | 16 | Daughter | — | Penna. |
| 16 | Adele Kozlowski | 14 | Daughter | — | Penna. |
| 17 | Stella Anderson | 33 | Sister-in-law | — | Poland |
| 18 | Philip Stankies | 52 | Lodger | Picker | Russia |
| 19 | Benidict Stupalis | 49 | Lodger | Body Maker | Lithuania |
| 20 | Beulah Adams | 26 | Head | Presser | South Carolina |
| 21 | Josephine Lyons | 34 | Head | — | S. Carolina |
| 22 | Evelyn Lyons | 16 | Daughter | New Worker | Penna. |
| 23 | Almania Lyons | 15 | Daughter | — | Penna. |
| 24 | Ruby Lyons | 12 | Daughter | — | Penna. |
| 25 | William Lyons | 11 | Son | — | Penna. |
| 26 | Fredrick Young | 35 | Head | Laborer | Ohio |
| 27 | Mary Young | 24 | Wife | Maid | Maryland |
| 28 | Nathaniel Hughes | 23 | Head | Truck Driver | Georgia |
| 29 | Leola Hughes | 19 | Wife | — | S. Carolina |
| 30 | Daniel Williams | 30 | Head | Agent | Georgia |
| 31 | Melvin Daldy | 31 | Partner | — | N. Carolina |
| 32 | Norman Brown | 41 | Head | Plasterer'S Help | Penna. |
| 33 | George Connor | 29 | Partner | — | Virginia |
| 34 | Joseph Johnson | 53 | Head | — | Virginia |
| 35 | Alice Johnson | 44 | Wife | — | Virginia |
| 36 | Anna Presley | 26 | Head | Wringer | Georgia |
| 37 | Lou Bell Presley | 10 | Daughter | — | Georgia |
| 38 | Henry Presley | 8 | Son | — | Georgia |
| 39 | Anna B. Presley | 6 | Daughter | — | Georgia |
| 40 | Heddy Penny | 59 | Mother | — | Georgia |
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)