MK
Mary Kozlowski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Erie, New York
Our Model Tree links this Mary Kozlowski across the 1910, 1920 and 1930 US Censuses in Erie, New York (XGBoost, ~Confirmed) — first a spouse (b.~1876), then head of a 5-person household.
Age 54
b. ~1876
Female
Spouse
Born: Germany
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Erie, New York |
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1892 |
| Age at First Marriage | 21 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Additional Details | |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | Polish |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
| Township / Ward | Buffalo City |
| Est. Birth Year | ~1876 |
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 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Tress Kozlowski | Daughter | — | 21 | ~1909 |
| Alois Kozlowski | Son | — | 16 | ~1914 |
| Herman Kozlowski | Head | — | 54 | ~1876 |
| Mary Kozlowski | Spouse | — | 54 | ~1876 |
| Amelia Kozlowski | Daughter | — | 12 | ~1918 |
Census Appearances
1910
Erie, New …
Spouse, age 35
Erie, New York · implied b. ~1875 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Germany |
| Years Married | 15 |
| Children Born | 6 |
| Children Living | 6 |
| Year of Immigration | 1890 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Polish |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1920
Erie, New …
Spouse, age 46
Erie, New York · implied b. ~1874 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 46 |
| Marital Status | Married |
| Birthplace | Germany |
| Year of Immigration | 1891 |
| Naturalization Status | Alien |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Housekeeper |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | German |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
1930
Erie, New …
Spouse, age 54
Erie, New York · implied b. ~1876 — 5 household members
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 54 |
| Marital Status | Married |
| Birthplace | Germany |
| Naturalization Status | Naturalized |
| Year of Immigration | 1892 |
| Age at First Marriage | 21 |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | none |
| Can Read/Write | Yes |
| Mother Tongue | Polish |
| Birth Country | Germany |
| Birthplace (normalized) | germany |
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 3 US Census years (1910, 1920 and 1930) in Erie, New York, using XGBoost record linkage.
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This person
Anchor record
Mary Kozlowski
Spouse · 1930 · age 54 · b. ~1876 · New York
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Erie, New York
Open full size
1930 US Federal Census — Erie, New York
Page Contents
50 people indexed on this census page (ia:1930:newyorkcensus00reel1425:0003)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John B. Wasilewski | 35 | Head | Laborer | Poland |
| 2 | Jennie Wasilewski | 29 | Wife | None | New York |
| 3 | Alfred J. Wasilewski | 11 | Son | None | New York |
| 4 | Genevieve J. Wasilewski | 9 | Daughter | None | New York |
| 5 | Ruth S. Wasilewski | 7 | Daughter | None | New York |
| 6 | Eleanor R. Wasilewski | 2 | Daughter | None | New York |
| 7 | Dorothy M. Wasilewski | 0 | Daughter | None | New York |
| 8 | John Manikowski | 47 | Head | Live Stock | New York |
| 9 | Lucy Manikowski | 36 | Wife | None | New York |
| 10 | Edna Manikowski | 12 | Daughter | None | New York |
| 11 | Gertrude Manikowski | 8 | Daughter | None | New York |
| 12 | Thomas Kazmierczak | 69 | Head | Retired | Germany |
| 13 | Frances Kazmierczak | 64 | Wife | None | Germany |
| 14 | John Kazmierczak | 42 | Son | Brakeman | Germany |
| 15 | Frank Kazmierczak | 26 | Son | Butcher | New York |
| 16 | Leo Kazmierczak | 23 | Son | Clerk | New York |
| 17 | Edmund Kazmierczak | 18 | Son | Butcher | New York |
| 18 | Frank Pinker | 32 | Head | Electrician | New York |
| 19 | Stella Pinker | 22 | Wife | None | New York |
| 20 | Leonard Pinker | 1 | Son | None | New York |
| 21 | Stanley Maraszek | 30 | Head | Welder | New York |
| 22 | Viola Maraszek | 28 | Wife | None | New York |
| 23 | Irene Maraszek | 8 | Daughter | None | New York |
| 24 | Eleanor Maraszek | 6 | Daughter | None | New York |
| 25 | Herman Kozlowski | 54 | Head | None | Germany |
| 26 | Mary Kozlowski THIS PERSON | 54 | Wife | None | Germany |
| 27 | Tress Kozlowski | 21 | Daughter | Helper | New York |
| 28 | Alois Kozlowski | 16 | Son | Mill Worker | New York |
| 29 | Amelia Kozlowski | 12 | Daughter | None | New York |
| 30 | Michael Malecki | 27 | Head | Labor | Pennsylvania |
| 31 | Frances Malecki | 24 | Wife | None | New York |
| 32 | Lorraine F. Malecki | 5 | Daughter | None | New York |
| 33 | Norman J. Malecki | 1 | Son | None | New York |
| 34 | Michael J. Hurdak | 28 | Head | Unloading | Ohio |
| 35 | Emely M. Hurdak | 22 | Wife | None | Pennsylvania |
| 36 | Joseph Zielinski | 60 | Head | Track Man | Germany |
| 37 | Mary Zielinski | 60 | Wife | None | Germany |
| 38 | Ignatz Zielinski | 19 | Son | Laborer | Germany |
| 39 | Frank Propiera | 36 | Head | Carpenter | New York |
| 40 | Martha Propiera | 28 | Wife | None | Germany |
| 41 | Eugene F. Propiera | 11 | Son | None | New York |
| 42 | Daphne M. Propiera | 9 | Daughter | None | New York |
| 43 | Eleanor F. Propiera | 6 | Daughter | None | New York |
| 44 | Rita S. Propiera | 5 | Daughter | None | New York |
| 45 | Daniel S. Propiera | 3 | Son | None | New York |
| 46 | Carl D. Imt | 26 | Head | Operator | New York |
| 47 | Clara B. Imt | 23 | Wife | None | New York |
| 48 | Daniel C. Imt | 3 | Son | None | New York |
| 49 | Peter Romanicz | 42 | Head | Pressman | Poland |
| 50 | Edeline Romanicz | 35 | Wife | None | New York |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)