JK
John Kowalski — 1940 US Census Record
Model Tree available1940 United States Federal Census · Kings-County, New York
Our Model Tree links this John Kowalski across the 1920, 1930 and 1940 US Censuses in Kings-County, New York (XGBoost, ~Confirmed), with identified parents Julian & Julius — first a son (b.~1916), then head of a 2-person household.
Age 24
b. ~1916
Male
Son
Born: New York
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Kings-County, New York |
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Additional Details | |
| Occupation | Labourer |
| Industry | Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1050 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Labourer |
| Township / Ward | New York City |
| 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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Kowalski | Son | — | 24 | ~1916 |
| Julian Kowalski | Head | — | 53 | ~1887 |
Census Appearances
1920
Kings, New …
Son, age 4
Kings, New York · implied b. ~1916 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Kings, New …
Son, age 14
Kings, New York · implied b. ~1916 — 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 | 14 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Kings-County, New …
Son, age 24
Kings-County, New York · implied b. ~1916 — 2 household members
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | New York |
| 1935 Residence (City) | New York City |
| 1935 Residence (County) | Kings |
| Occupation | Labourer |
| Industry | Factory |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1050 |
| Highest Grade | Hs 2 |
| 1935 Residence | Same place |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
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 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Julian Kowalski (~0.92 confidence) and father Julius Kowalski (~0.92 confidence) and mother Helena Kowalski (~0.92 confidence) and father Alexander Kowalski (~0.92 confidence) and mother Mary Kowalski (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Julian Kowalski
b. ~1887
Source father
● Household
· direct · ~0.92
Father
Julius Kowalski
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Helena Kowalski
b. ~1888
Source mother
● Household
· direct · ~0.92
Father
Alexander Kowalski
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Mary Kowalski
b. ~1892
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Kowalski
Son · 1940 · age 24 · b. ~1916 · New York
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Kings-County, New York
Open full size
1940 US Federal Census — Kings-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02569-00856)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Louise Herzer | 65 | Wife | — | New York |
| 42 | John Welack | 70 | Head | — | New York |
| 43 | Hattie Welack | 63 | Wife | — | New Jersey |
| 44 | Joseph Kowalski | 34 | Head | Clerk | Poland |
| 45 | Anna Kowalski | 24 | Wife | — | Pennsylvania |
| 46 | Paul Kowalski | 0 | Son | — | New York |
| 47 | Metro Sorochka | 22 | Brother-in-law | Laborer | Pennsylvania |
| 48 | Walter Sorochka | 20 | Brother-in-law | Laborer | Pennsylvania |
| 49 | Julian Kowalski | 53 | Head | Foreman | Poland |
| 50 | John Kowalski THIS PERSON | 24 | Son | Labourer | New York |
| 51 | John Brandoph | 31 | Head | Marine Fireman | New York |
| 52 | Isabel Brandoph | 25 | Wife | — | Canada-English |
| 53 | Frank Frasier | 39 | Head | Chef | New York |
| 54 | Concordina Frasier | 40 | Wife | — | Germany |
| 55 | Leopold Wiercinski | 33 | Head | — | Poland |
| 56 | Oliver Christensen | 30 | Head | Shipping Clerk | New York |
| 57 | Peter Olsen | 64 | Head | Clerk | New York |
| 58 | Otto F. Helpert | 55 | Head | — | New York |
| 59 | Henry Hagen | 69 | Head | — | Norway |
| 60 | Nels Edwards | 50 | Head | Chauffeur | New York |
| 61 | John O'Connell | 45 | Head | Longshoreman | Irish Free State |
| 62 | Albert Diviagio | 52 | Head | Laborer | Italy |
| 63 | Pietro Di Lorio | 42 | Head | Helper | Italy |
| 64 | John J. Mulroy | 44 | Head | Inspector | New York |
| 65 | Mary Mulroy | 49 | Wife | — | New York |
| 66 | Martha Kroger | 71 | Head | — | Germany |
| 67 | John Feldmann | 36 | Head | Bartender | Germany |
| 68 | Dorothy Feldmann | 35 | Wife | — | Germany |
| 69 | Henrietta Feldmann | 13 | Daughter | — | New York |
| 70 | John Feldmann | 10 | Son | — | New York |
| 71 | Raymond Feldmann | 7 | Son | — | New York |
| 72 | Henry Hay | 29 | Brother-in-law | Bartender | Germany |
| 73 | Serafina Forte | 55 | Head | Laborer | Italy |
| 74 | Mary Forte | 44 | Wife | — | Italy |
| 75 | Michael Forte | 25 | Son | Laborer | New York |
| 76 | Tony Forte | 23 | Son | New Worker | New York |
| 77 | Josephine Forte | 18 | Daughter | Hosiery Mender | New York |
| 78 | Carmela Forte | 14 | Daughter | — | New York |
| 79 | Eugene Forte | 7 | Son | — | New York |
| 80 | Peter Gambale | 27 | Head | Plater | New York |
Pedigree Summary
John
Gen 1 · 5 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 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)