MK
Mary Kozlowski — 1920 US Census Record
Linked across censuses1920 United States Federal Census · Luzerne, Pennsylvania
Our Model Tree links this Mary Kozlowski across the 1920 and 1930 US Censuses in Luzerne, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1916), then head of a 6-person household.
Age 4
b. ~1916
Female
Daughter
Born: Pennsylvania
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | Luzerne, Pennsylvania |
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Occupation | none |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Township / Ward | Nanticoke Borough |
| Est. Birth Year | ~1916 |
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.
6 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Kozlowski | Spouse | — | 29 | ~1891 |
| John Kozlowski | Head | — | 40 | ~1880 |
| Joseph Kozlowski | Son | — | 8 | ~1912 |
| Emelia Kozlowski | Daughter | — | 2 | ~1918 |
| Vadisie Kozlowski | Daughter | — | 6 | ~1914 |
| Mary Kozlowski | Daughter | — | 4 | ~1916 |
Census Appearances
1920
Luzerne, Pennsylvania
Daughter, age 4
Luzerne, Pennsylvania · implied b. ~1916 — 6 household members
| Surname | Kozlowski |
| Given Name | Mary |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | none |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Luzerne, Pennsylvania
Daughter, age 14
Luzerne, Pennsylvania · implied b. ~1916 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Koslowski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 (1920 and 1930) in Luzerne, Pennsylvania, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Kozlowski
Daughter · 1920 · age 4 · b. ~1916 · Pennsylvania
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Sibling
Emelia Kozlowski
Sibling · 1920 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Vadisie Kozlowski
Sibling · 1920 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Kozlowski
Sibling · 1920 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1920 US Federal Census — Luzerne, Pennsylvania
Open full size
1920 US Federal Census — Luzerne, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu1594unit:0936)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Helen Jackowski | 7 | daughter | — | Pennsylvania |
| 2 | Joseph Jarolim | 40 | Head | Miner | Czecho Slova |
| 3 | Anna Jarolim | 36 | Wife | None | Czecho Slova |
| 4 | Emil Jarolim | 17 | son | Breaker Boy | Czecho Slova |
| 5 | Emelia Jarolim | 15 | daughter | None | Czecho Slova |
| 6 | Otto Jarolim | 14 | son | None | Czecho Slova |
| 7 | Zdany Jarolim | 10 | son | None | Czecho Slova |
| 8 | John Balaza | 35 | Head | Miner | Poland |
| 9 | Helen Balaza | 30 | Wife | None | Poland |
| 10 | Andrew Yantz | 31 | Head | Laborer | Pennsylvania |
| 11 | Stella Yantz | 23 | Wife | None | Pennsylvania |
| 12 | Lillian Yantz | 5 | daughter | — | Pennsylvania |
| 13 | Martin Sobezak | 49 | Head | Miner | Poland |
| 14 | Frances Sobezak | 43 | Wife | None | Poland |
| 15 | John Sobezak | 27 | son | Motorman | Pennsylvania |
| 16 | Andrew Sobezak | 18 | son | Motorman | Pennsylvania |
| 17 | Anthony Sobezak | 16 | son | Driver | Pennsylvania |
| 18 | Stephen Sobezak | 14 | son | None | Pennsylvania |
| 19 | Kazimir Sobezak | 28 | son | Motorman | Pennsylvania |
| 20 | Melvin Petropis | 31 | Head | Laborer | Lithuania |
| 21 | Anna Petropis | 29 | Wife | None | Lithuania |
| 22 | Jacob Pijut | 39 | Head | Miner | Austria |
| 23 | Mary Pijut | 39 | Wife | None | Austria |
| 24 | John Pijut | 8 | son | None | Pennsylvania |
| 25 | Helen Pijut | 6 | daughter | None | Pennsylvania |
| 26 | George Pijut | 4 | son | None | Pennsylvania |
| 27 | Joseph Pijut | 1 | son | — | Pennsylvania |
| 28 | Joseph Pijut | 64 | father | Laborer | Austria |
| 29 | Joseph Kamaroski | 33 | Head | Miner | Poland |
| 30 | Anna Kamaroski | 29 | Wife | None | Pennsylvania |
| 31 | Leonard Kamaroski | 10 | son | None | Pennsylvania |
| 32 | Barney Kamaroski | 8 | son | None | Pennsylvania |
| 33 | Helen Kamaroski | 5 | daughter | None | Pennsylvania |
| 34 | Emelia Kamaroski | 1 | daughter | None | Pennsylvania |
| 35 | John Kozlowski | 40 | Head | Miner | Poland |
| 36 | Mary Kozlowski | 29 | Wife | None | Poland |
| 37 | Joseph Kozlowski | 8 | son | None | Pennsylvania |
| 38 | Vadisie Kozlowski | 6 | daughter | None | Pennsylvania |
| 39 | Mary Kozlowski THIS PERSON | 4 | daughter | None | Pennsylvania |
| 40 | Emelia Kozlowski | 2 | daughter | None | Pennsylvania |
| 41 | Peter Gill | 28 | Head | Miner | Poland |
| 42 | Anna Gill | 30 | Wife | None | Poland |
| 43 | Eleonore Gill | 6 | daughter | None | Pennsylvania |
| 44 | Eugene Gill | 3 | son | None | Pennsylvania |
| 45 | Edward Gill | 2 | son | None | Pennsylvania |
| 46 | Clara Gill | 0 | daughter | None | Pennsylvania |
| 47 | Stephen Marmuski | 26 | Head | Miner | Poland |
| 48 | Sophia Marmuski | 20 | Wife | None | Pennsylvania |
| 49 | Emelia Marmuski | 0 | daughter | None | Pennsylvania |
| 50 | Peter Wolgas | 44 | Head | Driver | Pennsylvania |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)