JK
John Kowalski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cuyahoga-County, Ohio
Our Model Tree links this John Kowalski across the 1930 and 1940 US Censuses in Cuyahoga-County, Ohio (XGBoost, ~Confirmed) — first a son (b.~1919), then head of a 10-person household.
Age 21
b. ~1919
Male
Son
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cuyahoga-County, Ohio |
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Cleveland city |
| 1935 Residence (County) | Cuyahoga |
| Additional Details | |
| Occupation | truck driver |
| Industry | trucking |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 420 |
| Highest Grade | No |
| 1935 Residence | Same House |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Occupation | Truck Driver |
| Township / Ward | Cleveland City |
| Est. Birth Year | ~1919 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Kowalski | Son | — | 21 | ~1919 |
| Stanley Kowalski | Son | — | 17 | ~1923 |
| Joe Kowalski | Son | — | 28 | ~1912 |
| Victoria Kowalski | Spouse | — | 46 | ~1894 |
| Jenny Kowalski | Daughter | — | 15 | ~1925 |
| Helen Kowalski | Daughter | — | 22 | ~1918 |
| Adam Kowalski | Son | — | 27 | ~1913 |
| Frank Kowalski | Son | — | 19 | ~1921 |
| Joe Kowalski | Head | — | 55 | ~1885 |
| Walter Kowalski | Son | — | 25 | ~1915 |
Census Appearances
1930
Cuyahoga, Ohio
Son, age 10
Cuyahoga, Ohio · implied b. ~1920 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Can Read/Write | Yes |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Cuyahoga-County, Ohio
Son, age 21
Cuyahoga-County, Ohio · implied b. ~1919 — 10 household members
| Surname | Kowalski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Cleveland city |
| 1935 Residence (County) | Cuyahoga |
| Occupation | truck driver |
| Industry | trucking |
| Class of Worker | PW |
| Hours Worked | 3 |
| Income (1939) | 420 |
| Highest Grade | No |
| 1935 Residence | Same House |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
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 (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kowalski
Son · 1940 · age 21 · b. ~1919 · Ohio
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Sibling
Helen Kowalski
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Kowalski
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Kowalski
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joe Kowalski
Sibling · 1940 · age 28
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Adam Kowalski
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Jenny Kowalski
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frank Kowalski
Sibling · 1940 · age 19
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
1940 US Federal Census — Cuyahoga-County, Ohio
Open full size
1940 US Federal Census — Cuyahoga-County, Ohio
Page Contents
21 people indexed on this census page (nara:1940:m-t0627-03209-00141)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert Brunswick | 23 | Son | Laborer | Ohio |
| 2 | Mary Buleki | 70 | Head | — | Poland |
| 3 | John Buleki | 52 | Son | — | Poland |
| 4 | Steve Buleki | 42 | Son | Box Assembler | Ohio |
| 5 | Andrew Buleki | 39 | Son | Laborer | Ohio |
| 6 | Tom Draks | 32 | Head | Electrician | Pennsylvania |
| 7 | Jessie Draks | 28 | Wife | Seamstress | Ohio |
| 8 | Josephine Draks | 3 | Daughter | — | Ohio |
| 9 | Joe Kowalski | 55 | Head | Laborer | Poland |
| 10 | Victoria Kowalski | 46 | Wife | — | Poland |
| 11 | Joe Kowalski | 28 | Son | Laborer | Poland |
| 12 | Adam Kowalski | 27 | Son | Truck Driver | Ohio |
| 13 | Walter Kowalski | 25 | Son | Box-Tender | Ohio |
| 14 | Helen Kowalski | 22 | Daughter | — | Ohio |
| 15 | John Kowalski THIS PERSON | 21 | Son | Truck Driver | Ohio |
| 16 | Frank Kowalski | 19 | Son | New Worker | Ohio |
| 17 | Stanley Kowalski | 17 | Son | — | Ohio |
| 18 | Jenny Kowalski | 15 | Daughter | — | Ohio |
| 19 | Anna Kowalski | 58 | Head | — | Poland |
| 20 | John Kowalski | 24 | Son | Factory Work | Ohio |
| 21 | Steve Zydiak | 26 | Lodger | Factory Work | Ohio |
Related Census Records
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)