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John Kowalski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · None, None
Our Model Tree links this John Kowalski across the 1920 and 1930 US Censuses (XGBoost, ~Confirmed) — first a son (b.~1912), then head of a 8-person household.
Age 18
b. ~1912
Male
Son
Born: Pennsylvania
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | None, None |
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Additional Details | |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Est. Birth Year | ~1912 |
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 |
|---|---|---|---|---|
| Agnes Kowalski | Daughter | — | 20 | ~1910 |
| Mary Kowalski | Spouse | — | 54 | ~1876 |
| John Kowalski | Son | — | 18 | ~1912 |
| Joseph Kowalski | Son | — | 20 | ~1910 |
| Andrew Kowalski | Son | — | 15 | ~1915 |
| Bernice Kowalski | Daughter | — | 13 | ~1917 |
| Ben Kowalski | Head | — | 54 | ~1876 |
| Walter Kowalski | Son | — | 10 | ~1920 |
Census Appearances
1920
None, None
Son, age 7
None, None · implied b. ~1913 — 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 | 7 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
None, None
Son, age 18
None, None · implied b. ~1912 — 8 household members
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | none |
| 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 None, None, using XGBoost record linkage.
Show:
This person
Anchor record
John Kowalski
Son · 1930 · age 18 · b. ~1912 · None
★ You are viewing this record
Sibling
Bernice Kowalski
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Kowalski
Sibling · 1930 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Kowalski
Sibling · 1930 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Andrew Kowalski
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Agnes Kowalski
Sibling · 1930 · age 20
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 — None, None
Open full size
1930 US Federal Census — None, None
Page Contents
50 people indexed on this census page (ia:1930:fifteenthcensus00reel2017:0491)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Victoria | 12 | Daughter | None | Pennsylvania |
| 2 | Raymond | 10 | Son | None | Pennsylvania |
| 3 | Amelia | 8 | Daughter | None | Pennsylvania |
| 4 | Helen | 6 | Daughter | None | Pennsylvania |
| 5 | John | 5 | Son | None | Pennsylvania |
| 6 | Frank | 3 | Son | None | Pennsylvania |
| 7 | Ben Kowalski | 54 | Head | Miner | Poland |
| 8 | Mary Kowalski | 54 | Wife | None | Poland |
| 9 | Agnes Kowalski | 20 | Daughter | None | Poland |
| 10 | Joseph Kowalski | 20 | Son | None | Pennsylvania |
| 11 | John Kowalski THIS PERSON | 18 | Son | None | Pennsylvania |
| 12 | Andrew Kowalski | 15 | Son | None | Pennsylvania |
| 13 | Bernice Kowalski | 13 | Daughter | None | Pennsylvania |
| 14 | Walter Kowalski | 10 | Son | None | Pennsylvania |
| 15 | Andrew Rito | 40 | Head | None | Czechoslovakia |
| 16 | Martin Rito | 16 | Son | Laborer | Pennsylvania |
| 17 | Margaret Rito | 12 | Daughter | None | Pennsylvania |
| 18 | Steve Rito | 9 | Son | None | Pennsylvania |
| 19 | George Rito | 7 | Son | None | Pennsylvania |
| 20 | Paul Rito | 3 | Son | None | Pennsylvania |
| 21 | Martin Comis | 41 | Brother-in-law | Laborer | Czechoslovakia |
| 22 | Andrew Daniel | 21 | Head | Miner | Pennsylvania |
| 23 | Anna Daniel | 16 | Wife | None | Pennsylvania |
| 24 | Andrew Havrilla|Havrila | 60 | Head | Miner | Czechoslovakia |
| 25 | Mary Havrilla|Havrila | 51 | Wife | None | Czechoslovakia |
| 26 | Mary Havrilla|Havrila | 18 | Daughter | None | Pennsylvania |
| 27 | Mike Havrilla|Havrila | 15 | Son | None | Pennsylvania |
| 28 | Vasco Havrilla|Havrila | 10 | Son | None | Pennsylvania |
| 29 | Katherine Ambrolic | 42 | Head | None | Czechoslovakia |
| 30 | Mary Ambrolic | 18 | Daughter | None | Pennsylvania |
| 31 | Mike Ambrolic | 17 | Son | Miner | Pennsylvania |
| 32 | John Ambrolic | 14 | Son | None | Pennsylvania |
| 33 | Mary Ambrolic | 11 | Daughter | None | Pennsylvania |
| 34 | Joe Ambrolic | 8 | Son | None | Pennsylvania |
| 35 | Martin Sollofsky | 62 | Head | Miner | Poland |
| 36 | Frances Sollofsky | 64 | Wife | None | Poland |
| 37 | Tony Slavorsky | 45 | Head | Miner | Poland |
| 38 | Linda Slavorsky | 41 | Wife | None | Poland |
| 39 | Lewis Tokosh | 42 | Head | Miner | Hungary |
| 40 | Flora Tokosh | 48 | Wife | None | Hungary |
| 41 | Ralph Tokosh | 16 | Son | Miner | Pennsylvania |
| 42 | Amelia Tokosh | 14 | Daughter | None | Pennsylvania |
| 43 | Mike Harp | 56 | Head | Miner | Poland |
| 44 | Helen Harp | 47 | Wife | None | Poland |
| 45 | Nicholas Harp | 15 | Son | Laborer | Pennsylvania |
| 46 | Jessie Harp | 12 | Daughter | None | Pennsylvania |
| 47 | Paul Harp | 10 | Son | None | Pennsylvania |
| 48 | Dorothy Harp | 8 | Daughter | None | Pennsylvania |
| 49 | Joseph Eremsky | 38 | Head | Miner | Czechoslovakia |
| 50 | Mary Eremsky | 35 | Wife | None | Czechoslovakia |
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)