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John Kowalski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Allegheny, Pennsylvania
Our Model Tree links this John Kowalski across the 1920 and 1930 US Censuses in Allegheny, Pennsylvania (XGBoost, ~Confirmed) — first a son (b.~1909), then head of a 8-person household.
Age 21
b. ~1909
Male
Son
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Allegheny, Pennsylvania |
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Occupation | Spanner |
| Industry | Steel Mill |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Spanner |
| Township / Ward | Pittsburg |
| Est. Birth Year | ~1909 |
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 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Emilla Kowalski | Spouse | — | 48 | ~1882 |
| Stanley Kowalski | Son | — | 18 | ~1912 |
| John Kowalski | Son | — | 21 | ~1909 |
| Pearl Kowalski | Daughter | — | 16 | ~1914 |
| Mary Kowalski | Daughter | — | 24 | ~1906 |
| Irene Kowalski | Daughter | — | 10 | ~1920 |
| Adam Kowalski | Head | — | 58 | ~1872 |
| Lawrence Kowalski | Son | — | 7 | ~1923 |
Census Appearances
1920
Allegheny, Pennsylvania
Son, age 12
Allegheny, Pennsylvania · implied b. ~1908 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 12 |
| 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
Allegheny, Pennsylvania
Son, age 21
Allegheny, Pennsylvania · implied b. ~1909 — 8 household members
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Spanner |
| Industry | Steel 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 John Kowalski across 2 US Census years (1920 and 1930) in Allegheny, Pennsylvania, using XGBoost record linkage.
Show:
This person
Anchor record
John Kowalski
Son · 1930 · age 21 · b. ~1909 · Pennsylvania
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Sibling
Pearl Kowalski
Sibling · 1930 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lawrence Kowalski
Sibling · 1930 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Kowalski
Sibling · 1930 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Kowalski
Sibling · 1930 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Irene Kowalski
Sibling · 1930 · age 10
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 — Allegheny, Pennsylvania
Open full size
1930 US Federal Census — Allegheny, Pennsylvania
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel1972:0537)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Laura Cozak | 12 | Daughter | — | Pennsylvania |
| 2 | Frank Cozak | 10 | Son | — | Pennsylvania |
| 3 | Walter Cozak | 8 | Son | — | Pennsylvania |
| 4 | James Queen | 37 | Head | Cook | Pennsylvania |
| 5 | Robert Queen | 3 | Son | — | Pennsylvania |
| 6 | Elizabeth Fulmer | 40 | Servant H | Housekeeper | Pennsylvania |
| 7 | Helen Sluchocki | 19 | Head | Press Machine | Pennsylvania |
| 8 | Veronica Sluchocki | 49 | Mother | — | Poland |
| 9 | Edward Sluchocki | 16 | Son | Press Machine | Pennsylvania |
| 10 | Walter Sluchocki | 14 | Son | — | Pennsylvania |
| 11 | Frances Sluchocki | 12 | Daughter | — | Pennsylvania |
| 12 | Mathilda Sluchocki | 10 | Daughter | — | Pennsylvania |
| 13 | Nicholas Schutz | 62 | Head | Labor | Germany |
| 14 | Henry Schutz | 24 | Son | Salesman | Pennsylvania |
| 15 | George Schutz | 23 | Son | Mechanic | Pennsylvania |
| 16 | Andrew Satalich | 42 | Head | Mechanic | Austria |
| 17 | Elizabeth Satalich | 42 | Wife | — | Austria |
| 18 | Mary Satalich | 19 | Daughter | Saleslady | Pennsylvania |
| 19 | Victor Satalich | 16 | Son | Clerk | Pennsylvania |
| 20 | Zana Satalich | 15 | Daughter | — | Pennsylvania |
| 21 | Edward Satalich | 12 | Son | — | Pennsylvania |
| 22 | Helen Satalich | 9 | Daughter | — | Pennsylvania |
| 23 | William G. Mueller | 20 | Head | Chemist | Pennsylvania |
| 24 | Helen Eliz. Mueller | 21 | Wife | — | Pennsylvania |
| 25 | William Jr. Mueller | 1 | Son | — | Pennsylvania |
| 26 | Stanley Zielinski | 34 | Head | Labor | Poland |
| 27 | Josephine Zielinski | 27 | Wife | — | Pennsylvania |
| 28 | Regina Zielinski | 8 | Daughter | — | Pennsylvania |
| 29 | Gertrude Zielinski | 6 | Daughter | — | Pennsylvania |
| 30 | Rita Zielinski | 5 | Daughter | — | Pennsylvania |
| 31 | Richard Zielinski | 2 | Son | — | Pennsylvania |
| 32 | Adam Kowalski | 58 | Head | Labor | Poland |
| 33 | Emilla Kowalski | 48 | Wife | — | Poland |
| 34 | Mary Kowalski | 24 | Daughter | Machinery | Pennsylvania |
| 35 | John Kowalski THIS PERSON | 21 | Son | Spanner | Pennsylvania |
| 36 | Stanley Kowalski | 18 | Son | Labor | Pennsylvania |
| 37 | Pearl Kowalski | 16 | Daughter | Machinery | Pennsylvania |
| 38 | Irene Kowalski | 10 | Daughter | — | Pennsylvania |
| 39 | Lawrence Kowalski | 7 | Son | — | Pennsylvania |
| 40 | Walter Janiszewski | 41 | Head | Labor | Poland |
| 41 | Adelia Janiszewski | 40 | Wife | — | Poland |
| 42 | Arthur Janiszewski | 18 | Son | — | Pennsylvania |
| 43 | Lucille Janiszewski | 14 | Daughter | — | Pennsylvania |
| 44 | Walter Janiszewski | 12 | Son | — | Pennsylvania |
| 45 | Samuel Marcinkowski | 40 | Head | Labor | Poland |
| 46 | John Pater | 60 | Head | Porter | Kentucky |
| 47 | Milton Pater | 18 | Son | Errand | Pennsylvania |
| 48 | Jacob H. Starkhouse | 54 | Head | Carpenter | Illinois |
| 49 | Elizabeth Starkhouse | 50 | Wife | — | Kentucky |
| 50 | Mabel Starkhouse | 21 | Daughter | Milliner | Pennsylvania |
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)