JK
John Kowalski — 1940 US Census Record
Model Tree available1940 United States Federal Census · Wayne-County, Michigan
Our Model Tree links this John Kowalski across the 1920, 1930 and 1940 US Censuses in Wayne-County, Michigan (XGBoost, ~Confirmed), with identified parents August & Augusta — first a head (b.~1905), then head of a 4-person household.
Age 35
b. ~1905
Male
Head
Born: Michigan
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Wayne-County, Michigan |
| Surname | Kowalski |
| Given Name | John A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Michigan |
| 1935 Residence (City) | River Rouge |
| 1935 Residence (County) | Wayne |
| Additional Details | |
| Occupation | Switchman |
| Industry | Steam railroad |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1722 |
| Highest Grade | No 7 |
| 1935 Residence | Michigan |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
| Occupation | Switchman |
| Township / Ward | Ecorse |
| Est. Birth Year | ~1905 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Kowalski | Head | — | 35 | ~1905 |
| Evelyn Kowalski | Spouse | — | 33 | ~1907 |
| John Kowalski | Son | — | 15 | ~1925 |
| Harold Kowalski | Son | — | 13 | ~1927 |
Census Appearances
1920
Wayne, Michigan
Son, age 14
Wayne, Michigan · implied b. ~1906 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalske |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Michigan |
| Father's Birthplace | Germany |
| Mother's Birthplace | Germany |
| Occupation | Boyce |
| Industry | Iron foundry |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1930
Wayne, Michigan
Head, age 25
Wayne, Michigan · implied b. ~1905 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kowalske |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Married |
| Birthplace | Michigan |
| Age at First Marriage | 20 |
| Father's Birthplace | Wisconsin |
| Mother's Birthplace | Germany |
| Occupation | Switchman |
| Industry | Steam railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 35 |
| Radio Set | R |
| Veteran | No |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
1940
Wayne-County, Michigan
Head, age 35
Wayne-County, Michigan · implied b. ~1905 — 4 household members
| Surname | Kowalski |
| Given Name | John A. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Michigan |
| 1935 Residence (City) | River Rouge |
| 1935 Residence (County) | Wayne |
| Occupation | Switchman |
| Industry | Steam railroad |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 1722 |
| Highest Grade | No 7 |
| 1935 Residence | Michigan |
| Birth State | Michigan |
| Birth Country | United States |
| Birthplace (normalized) | michigan |
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 August Kowalske (~0.92 confidence) and mother Augusta Kowalske (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
August Kowalske
b. ~1874
Source father
● Household
· direct · ~0.92
Mother
Augusta Kowalske
b. ~1875
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Kowalski
Head · 1940 · age 35 · b. ~1905 · Michigan
★ 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 — Wayne-County, Michigan
Open full size
1940 US Federal Census — Wayne-County, Michigan
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01827-00515)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Sotirios Pavlou | 46 | Lodger | Laborer | Greece |
| 42 | Charles Simpson | 37 | Lodger | 66 | Greece |
| 43 | William Murdock | 46 | Head | Oiler | Scotland |
| 44 | Kate Murdock | 40 | Wife | — | England |
| 45 | Hazel Murdock | 19 | Daughter | Saleswoman | Canada-English |
| 46 | Neal J. Murdock | 10 | Son | — | Michigan |
| 47 | Duncan F. Murdock | 6 | Son | — | Michigan |
| 48 | Jerome W. Davidson | 43 | Head | Electric Crane Operat. | W. Virginia |
| 49 | Vesta K. Davidson | 36 | Wife | — | W. Virginia |
| 50 | Benny L. Davidson | 16 | Step-son | Solicitor | Kentucky |
| 51 | Juanita J. Davidson | 14 | Step-daughter | — | W. Virginia |
| 52 | Leon S. Grandjean | 59 | Head | Labour | France |
| 53 | Emma Grandjean | 62 | Wife | — | Germany |
| 54 | Andre B. Grandjean | 27 | Son | 104 | New York |
| 55 | Vido Vuknovich | 44 | Head | Labour | Yugoslavia |
| 56 | Joseph G. Ramos | 39 | Lodger | Crane Hooker | Spain |
| 57 | Olga Cochorvich | 55 | Lodger | 104 | Yugoslavia |
| 58 | Charles J. Stala | 43 | Head | Cleaning House | Michigan |
| 59 | Lucy Stala | 40 | Wife | — | Michigan |
| 60 | Thad R. Luczyk | 20 | Step-son | Draftsman | Michigan |
| 61 | Kathleen Stala | 15 | Daughter | — | Michigan |
| 62 | John A. Kowalski THIS PERSON | 35 | Head | Switchman | Michigan |
| 63 | Evelyn Kowalski | 33 | Wife | — | Michigan |
| 64 | John R. Kowalski | 15 | Son | — | Michigan |
| 65 | Harold F. Kowalski | 13 | Son | — | Michigan |
| 66 | Harry Jr. Rose | 27 | Head | Machine Operator | Ohio |
| 67 | Edna Rose | 19 | Wife | — | Kentucky |
| 68 | Phyllis Rose | 5 | Daughter | — | Michigan |
| 69 | John L. Whitesell | 34 | Head | Assembler | Ohio |
| 70 | Stella E. Whitesell | 33 | Wife | — | Ohio |
| 71 | Betty J. Whitesell | 14 | Daughter | — | Ohio |
| 72 | Ruth E. Whitesell | 13 | Daughter | — | Ohio |
| 73 | Carl E. Whitesell | 12 | Son | — | Ohio |
| 74 | William Butler | 34 | Head | Strander | Tennessee |
| 75 | Irene E. Butler | 25 | Wife | — | Michigan |
| 76 | William Jr. Butler | 5 | Son | — | Michigan |
| 77 | Thomas Rhiney | 45 | Head | Shear Helper | Missouri |
| 78 | Lillian Rhiney | 42 | Wife | — | Missouri |
| 79 | Lemuel Knapp | 28 | Lodger | Shear Helper | Missouri |
| 80 | Margaret Knapp | 20 | Lodger | — | Illinois |
Pedigree Summary
John
Gen 1 · 2 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)