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Mary Kowalski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Philadelphia, Pennsylvania
Our Model Tree links this Mary Kowalski across the 1920 and 1930 US Censuses in Philadelphia, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1906), then head of a 11-person household.
Age 24
b. ~1906
Female
Daughter
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Philadelphia, Pennsylvania |
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Occupation | Looper |
| Industry | Hosiery Mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Looper |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1906 |
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.
11 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| John Kowalski | Son | — | 10 | ~1920 |
| Regina Kowalski | Daughter | — | 13 | ~1917 |
| Rita Kowalski | Daughter | — | 5 | ~1925 |
| Mary Kowalski | Daughter | — | 24 | ~1906 |
| Jane Kowalski | Daughter | — | 20 | ~1910 |
| John Kowalski | Head | — | 50 | ~1880 |
| Charles Kowalski | Son | — | 8 | ~1922 |
| Stanley Kowalski | Son | — | 22 | ~1908 |
| Leo Kowalski | Son | — | 15 | ~1915 |
| Stella Kowalski | Other | — | 46 | ~1884 |
| Frances Kowalski | Daughter | — | 17 | ~1913 |
Census Appearances
1920
Philadelphia, Pennsylvania
Daughter, age 13
Philadelphia, Pennsylvania · implied b. ~1907 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Philadelphia, Pennsylvania
Daughter, age 24
Philadelphia, Pennsylvania · implied b. ~1906 — 11 household members
| Surname | Kowalski |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Looper |
| Industry | Hosiery Mill |
| Class of Worker | W |
| 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 Kowalski across 2 US Census years (1920 and 1930) in Philadelphia, Pennsylvania, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Kowalski
Daughter · 1930 · age 24 · b. ~1906 · Pennsylvania
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Sibling
Leo Kowalski
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jane Kowalski
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Kowalski
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Kowalski
Sibling · 1930 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Kowalski
Sibling · 1930 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Kowalski
Sibling · 1930 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Regina Kowalski
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frances Kowalski
Sibling · 1930 · age 17
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
1930 US Federal Census — Philadelphia, Pennsylvania
Open full size
1930 US Federal Census — Philadelphia, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2100:0395)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Frances Deamer | 27 | Head-H | None | Pennsylvania |
| 2 | Eleanor M Deamer | 1 | Daughter | None | Pennsylvania |
| 3 | Frank Kirimich | 36 | Head | Casher | Hungary-Austrian |
| 4 | Jennie Kirimich | 24 | Wife-H | None | Hungary-Austrian |
| 5 | Marion Kirimich | 3 | Daughter | None | Pennsylvania |
| 6 | Anthony Chmiewska | 40 | Head | Cleaner | Poland |
| 7 | Veronica Chmiewska | 36 | Wife-H | None | Poland |
| 8 | Frances Chmiewska | 14 | Daughter | None | Pennsylvania |
| 9 | Mary Chmiewska | 13 | Daughter | None | Pennsylvania |
| 10 | John Chmiewska | 11 | Son | None | Pennsylvania |
| 11 | Josephine Chmiewska | 8 | Daughter | None | Pennsylvania |
| 12 | Helen Chmiewska | 5 | Daughter | None | Pennsylvania |
| 13 | Irene Chmiewska | 2 | Daughter | None | Pennsylvania |
| 14 | John Mankowski | 40 | Head-H | Laborer | Pennsylvania |
| 15 | Mary Mankowski | 38 | Wife-H | None | Pennsylvania |
| 16 | Joseph Morawski | 72 | Head | Stableman | Poland |
| 17 | Agnes Morawski | 62 | Wife-H | None | Poland |
| 18 | Anthony Morawski | 33 | Son | None | Pennsylvania |
| 19 | Joseph Morawski | 23 | Son | Painter | Pennsylvania |
| 20 | Walter Krystkiewicz | 45 | Head | Bricklayer | Poland |
| 21 | Sophia Krystkiewicz | 37 | Wife-H | None | Poland |
| 22 | Natalie Krystkiewicz | 18 | Daughter | None | Pennsylvania |
| 23 | Mary Krystkiewicz | 16 | Daughter | None | Pennsylvania |
| 24 | Agnes Krystkiewicz | 10 | Daughter | None | Pennsylvania |
| 25 | Jennie Krystkiewicz | 8 | Daughter | None | Pennsylvania |
| 26 | Helen Krystkiewicz | 5 | Daughter | None | Pennsylvania |
| 27 | James Roach | 44 | Head | Helper | New York |
| 28 | Anna Roach | 52 | Wife-H | None | New York |
| 29 | Urban Domalski | 72 | Head | Laborer | Poland |
| 30 | Caroline Domalski | 67 | Wife-H | None | Poland |
| 31 | Margaret Murray | 70 | Mother-in-law | None | Ireland |
| 32 | James Murray | 35 | Son | Shearer | Pennsylvania |
| 33 | Luke Gorba | 36 | Head-H | Cutter | Poland |
| 34 | John Kowalski | 50 | Head | Sorter | Poland |
| 35 | Stella Kowalski | 46 | Wife-H | None | Poland |
| 36 | Mary Kowalski THIS PERSON | 24 | Daughter | Looper | Pennsylvania |
| 37 | Stanley Kowalski | 22 | Son | Laborer | Pennsylvania |
| 38 | Jane Kowalski | 20 | Daughter | Packer | Pennsylvania |
| 39 | Frances Kowalski | 17 | Daughter | Packer | Pennsylvania |
| 40 | Leo Kowalski | 15 | Son | Helper | Pennsylvania |
| 41 | Regina Kowalski | 13 | Daughter | None | Pennsylvania |
| 42 | John Kowalski | 10 | Son | None | Pennsylvania |
| 43 | Charles Kowalski | 8 | Son | None | Pennsylvania |
| 44 | Rita Kowalski | 5 | Daughter | None | Pennsylvania |
| 45 | Anthony Plonezaski | 46 | Head | Carpenter | Poland |
| 46 | Constance Plonezaski | 34 | Wife-H | None | Poland |
| 47 | Stanley Plonezaski | 12 | Son | None | Pennsylvania |
| 48 | Frances Plonezaski | 10 | Daughter | None | Pennsylvania |
| 49 | Joseph Plonezaski | 8 | Son | None | Pennsylvania |
| 50 | Alexander Plonezaski | 8 | Son | None | Pennsylvania |
Related Census Records
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)