JK
John Kowalski — 1940 US Census Record
Model Tree available1940 United States Federal Census · Suffolk-County, New York
Our Model Tree links this John Kowalski across the 1920, 1930 and 1940 US Censuses in Suffolk-County, New York (XGBoost, ~Confirmed), with identified parents Theodore & Annie — first a head (b.~1908), then head of a 3-person household.
Age 32
b. ~1908
Male
Head
Born: New York
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Suffolk-County, New York |
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | Jamesport |
| 1935 Residence (County) | Suffolk |
| Additional Details | |
| Occupation | laborer |
| Industry | well driller |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 800 |
| Highest Grade | H 2 |
| 1935 Residence | New York |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
| Occupation | Laborer |
| Township / Ward | South Jamesport |
| Est. Birth Year | ~1908 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Kowalski | Head | — | 32 | ~1908 |
| Martha Kowalski | Spouse | — | 31 | ~1909 |
| Patricia Kowalski | Daughter | — | 1 | ~1939 |
Census Appearances
1920
Suffolk, New …
Son, age 12
Suffolk, New York · implied b. ~1908 — 9 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 | New York |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1930
Suffolk, New …
Son, age 22
Suffolk, New York · implied b. ~1908 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 22 |
| Marital Status | Single |
| Birthplace | New York |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Occupation | Painter |
| Industry | House |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | New York |
| Birth Country | United States |
| Birthplace (normalized) | new york |
1940
Suffolk-County, New …
Head, age 32
Suffolk-County, New York · implied b. ~1908 — 3 household members
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 32 |
| Marital Status | Married |
| Birthplace | New York |
| 1935 Residence (City) | Jamesport |
| 1935 Residence (County) | Suffolk |
| Occupation | laborer |
| Industry | well driller |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 800 |
| Highest Grade | H 2 |
| 1935 Residence | New York |
| 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 Theodore Kowalski (~0.92 confidence) and mother Annie Kowalski (~0.92 confidence) and father John Kowalski (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Theodore Kowalski
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Annie Kowalski
b. ~1877
Source mother
● Household
· direct · ~0.92
Father
John Kowalski
b. ~1877
Source father
● Household
· direct · ~0.92
This person
Anchor record
John Kowalski
Head · 1940 · age 32 · b. ~1908 · 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 — Suffolk-County, New York
Open full size
1940 US Federal Census — Suffolk-County, New York
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-02788-00063)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edwina Haupt | 14 | Niece | — | New York |
| 42 | Edward Raciniewski | 29 | Head | Claming | New York |
| 43 | Estelle Raciniewski | 27 | Wife | — | New York |
| 44 | Frances Raciniewski | 6 | Daughter | — | New York |
| 45 | Richard Raciniewski | 1 | Son | — | New York |
| 46 | Frank Sobotka | 29 | Head | — | New York |
| 47 | Jennie Sobotka | 27 | Wife | Laborer | New York |
| 48 | Sylvia Sobotka | 5 | Daughter | — | New York |
| 49 | Theresa Sobotka | 1 | Daughter | — | New York |
| 50 | George Gachom | 30 | Head | Laborer | Florida |
| 51 | Ruby Gachom | 27 | Wife | — | Virginia |
| 52 | John Kowalski THIS PERSON | 32 | Head | Laborer | New York |
| 53 | Martha Kowalski | 31 | Wife | — | New York |
| 54 | Patricia Kowalski | 1 | Daughter | — | New York |
| 55 | Joseph K Yevinski | 38 | Head | Laborer | New Jersey |
| 56 | Mary Yevinski | 33 | Wife | — | New Jersey |
| 57 | Edward Yevinski | 7 | Son | — | New York |
| 58 | Bruno Haupt | 42 | Head | Court Officer | New York |
| 59 | Josephine Haupt | 31 | Wife | — | New York |
| 60 | John Laymeni | 42 | Head | Laborer | New York |
| 61 | Anna Laymeni | 29 | Wife | — | New York |
| 62 | Rosanna Laymeni | 18 | Daughter | — | New York |
| 63 | Alice Laymeni | 14 | Daughter | — | New York |
| 64 | Grace Laymeni | 10 | Daughter | — | New York |
| 65 | Joseph Romanchik | 47 | Head | Proprietor | New York |
| 66 | Stella Romanchik | 43 | Wife | — | New Jersey |
| 67 | Cornelia Romanchik | 22 | Daughter | Principal | New York |
| 68 | Joseph Kobymago | 61 | Head | Janitor | Poland |
| 69 | Frances Kobymago | 59 | Wife | — | Poland |
| 70 | Loretta Meyer | 31 | Daughter | Typist | Connecticut |
| 71 | Alice Meyer | 5 | Granddaughter | — | New York |
| 72 | Frank Batroski | 50 | Head | Laborer | Poland |
| 73 | Bertha Batroski | 46 | Wife | — | New Jersey |
| 74 | Frank Jr Batroski | 20 | Son | — | New York |
| 75 | Arlene Batroski | 16 | Daughter | — | New York |
| 76 | Stanley Zaleski | 58 | Head | Laborer | Poland |
| 77 | Steve Baubauk | 53 | Boarder | Laborer | Poland |
| 78 | Theodore Yevinski | 35 | Head | Claming | New Jersey |
| 79 | Mary Yevinski | 28 | Wife | — | New York |
| 80 | Josephine Yevinski | 61 | Head | — | Poland |
Pedigree Summary
John
Gen 1 · 3 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)