MK
Mary Kozlowski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Erie-County, New York
Our Model Tree links this Mary Kozlowski across the 1930 and 1940 US Censuses in Erie-County, New York (XGBoost, ~Confirmed) — first a spouse (b.~1893), then head of a 12-person household.
Age 47
b. ~1893
Female
Spouse
Born: Poland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Erie-County, New York |
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Buffalo city |
| 1935 Residence (County) | Erie |
| Naturalization Status | Alien |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
| Township / Ward | Buffalo City |
| Est. Birth Year | ~1893 |
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.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Regina Kozlowski | Daughter | — | 12 | ~1928 |
| Jennie Kozlowski | Daughter | — | 17 | ~1923 |
| Chester Kozlowski | Son | — | 10 | ~1930 |
| Genevieve Kozlowski | Daughter | — | 19 | ~1921 |
| Florence Kozlowski | Daughter | — | 14 | ~1926 |
| Edward Kozlowski | Son | — | 7 | ~1933 |
| Joseph Kozlowski | Son | — | 25 | ~1915 |
| Joseph Kozlowski | Head | — | 57 | ~1883 |
| Mary Kozlowski | Daughter | — | 5 | ~1935 |
| Mary Kozlowski | Spouse | — | 47 | ~1893 |
| Helen Kozlowski | Daughter | — | 21 | ~1919 |
| Sophie Kozlowski | Daughter | — | 26 | ~1914 |
Census Appearances
1930
Erie, New …
Other, age 37
Erie, New York · implied b. ~1893 — 10 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 | 37 |
| Marital Status | Married |
| Birthplace | Poland |
| Naturalization Status | Alien |
| Year of Immigration | 1910 |
| Age at First Marriage | 19 |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | Polish |
| Veteran | No |
| Birth Country | Poland |
| Birthplace (normalized) | poland |
1940
Erie-County, New …
Spouse, age 47
Erie-County, New York · implied b. ~1893 — 12 household members
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 47 |
| Marital Status | Married |
| Birthplace | Poland |
| 1935 Residence (City) | Buffalo city |
| 1935 Residence (County) | Erie |
| Naturalization Status | Alien |
| Income (1939) | 0 |
| Highest Grade | No 8 |
| 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 47 · b. ~1893 · New York
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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 — Erie-County, New York
Open full size
1940 US Federal Census — Erie-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02837-00228)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Nepomucen Holowinski | 51 | Head | Kitchen Helper | Poland |
| 2 | Stephania Holowinski | 46 | Wife | Kitchen Helper | Poland |
| 3 | Wanda Holowinski | 32 | Daughter | — | New York |
| 4 | Anthony Holowinski | 43 | Head | Press Operator | New York |
| 5 | Mildred Holowinski | 42 | Wife | — | New York |
| 6 | Alphonse Kucewicz | 47 | Head | — | Poland |
| 7 | Mary Kucewicz | 48 | Wife | Seamstress | New York |
| 8 | Henrietta Kucewicz | 21 | Daughter | Housework | New York |
| 9 | Alfred Kucewicz | 18 | Son | Clerk | New York |
| 10 | Sigmund Kucewicz | 14 | Son | — | New York |
| 11 | Joseph Kozlowski | 57 | Head | Molder Helper | Poland |
| 12 | Mary Kozlowski THIS PERSON | 47 | Wife | — | Poland |
| 13 | Sophie Kozlowski | 26 | Daughter | Press Operator | New York |
| 14 | Joseph Kozlowski | 25 | Son | Galvanizer | New York |
| 15 | Helen Kozlowski | 21 | Daughter | Assembler | New York |
| 16 | Genevieve Kozlowski | 19 | Daughter | Housework | New York |
| 17 | Jennie Kozlowski | 17 | Daughter | New Worker | New York |
| 18 | Florence Kozlowski | 14 | Daughter | — | New York |
| 19 | Regina Kozlowski | 12 | Daughter | — | New York |
| 20 | Chester Kozlowski | 10 | Son | — | New York |
| 21 | Edward Kozlowski | 7 | Son | — | New York |
| 22 | Mary Kozlowski | 5 | Daughter | — | New York |
| 23 | Walter Bochnia | 50 | Head | Trucker | Poland |
| 24 | Stella Bochnia | 37 | Wife | — | New York |
| 25 | Helen Bochnia | 20 | Daughter | Housework | New York |
| 26 | Mary Bochnia | 15 | Son | New Worker | New York |
| 27 | Genevieve Bochnia | 10 | Daughter | — | New York |
| 28 | Peter Klemps | 50 | Head | Laborer | Poland |
| 29 | Catherine Klemps | 51 | Wife | — | Poland |
| 30 | Walter Klemps | 31 | Son | Bartender | New York |
| 31 | Wojciech Szabla | 48 | Head | Grinder | Poland |
| 32 | Sophia Szabla | 45 | Wife | Charwoman | Poland |
| 33 | Pauline Szabla | 24 | Daughter | Assembler | New Jersey |
| 34 | Sophie Szabla | 23 | Daughter | Striper | New Jersey |
| 35 | Hedwig Szabla | 18 | Daughter | Bobbin Setter | New Jersey |
| 36 | Stanley Szabla | 15 | Son | — | New York |
| 37 | Edward Szwec | 53 | Head | Molder | Poland |
| 38 | Julia Szwec | 44 | Wife | — | Poland |
| 39 | Marie Szwec | 18 | Daughter | Housework | New York |
| 40 | Anthony Szwec | 16 | Son | — | New York |
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)