JK
John Kozlowski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Wayne-County, Michigan
Our Model Tree links this John Kozlowski across the 1930 and 1940 US Censuses in Wayne-County, Michigan (XGBoost, ~Confirmed) — first a son (b.~1915), then head of a 6-person household.
Age 25
b. ~1915
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Wayne-County, Michigan |
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Hamtramck City |
| 1935 Residence (County) | Wayne |
| Additional Details | |
| Occupation | Truck driver |
| Industry | Cartage Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1500 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Truck Driver |
| Township / Ward | Hamtramck City |
| Est. Birth Year | ~1915 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Juanita Kozlowski | Daughter | — | 14 | ~1926 |
| Walter Kozlowski | Daughter | — | 11 | ~1929 |
| Peter Kozlowski | Head | — | 52 | ~1888 |
| John Kozlowski | Son | — | 25 | ~1915 |
| Stella Kozlowski | Daughter | — | 20 | ~1920 |
| Hattie Kozlowski | Daughter | — | 21 | ~1919 |
Census Appearances
1930
Wayne, Michigan
Son, age 15
Wayne, Michigan · implied b. ~1915 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlowski |
| Given Name | John L. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Poland |
| Mother's Birthplace | Poland |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Wayne-County, Michigan
Son, age 25
Wayne-County, Michigan · implied b. ~1915 — 6 household members
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 25 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | Hamtramck City |
| 1935 Residence (County) | Wayne |
| Occupation | Truck driver |
| Industry | Cartage Co. |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 1500 |
| Highest Grade | H 3 |
| 1935 Residence | Same place |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Kozlowski across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Kozlowski
Son · 1940 · age 25 · b. ~1915 · Michigan
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Sibling
Hattie Kozlowski
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stella Kozlowski
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Juanita Kozlowski
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Walter Kozlowski
Sibling · 1940 · age 11
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 — 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-t0627-01830-00412)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Edward Nowak | 3 | Son | — | Michigan |
| 42 | Donald Nowak | 1 | Son | — | Michigan |
| 43 | Sylvester Gwarda | 27 | Head | Punch Press | New York |
| 44 | Hedwig Gwarda | 26 | Wife | — | Ohio |
| 45 | Richard Gwarda | 2 | Son | — | Michigan |
| 46 | John Zebrowski | 58 | Father | Sewage Man | Poland |
| 47 | Marcella Zebrowski | 52 | Mother | H | Poland |
| 48 | Frank Napiorkowski | 29 | Head | Trucking | Pennsylvania |
| 49 | Josephine Napiorkowski | 29 | Wife | H | Pennsylvania |
| 50 | Anthony Zacharski | 56 | Head | Baker | Poland |
| 51 | Mary Zacharski | 49 | Wife | H | Poland |
| 52 | Gertrude Zacharski | 15 | Daughter | S | Michigan |
| 53 | Romuald Tyborowski | 48 | Head | Bumper | Poland |
| 54 | Genevieve Tyborowski | 41 | Wife | H | Poland |
| 55 | Alvina Tyborowski | 21 | Daughter | Hand Trimmer | New York |
| 56 | Jane Tyborowski | 19 | Daughter | Saleslady | New York |
| 57 | Ronald Tyborowski | 2 | Son | — | Michigan |
| 58 | Michael Socha | 25 | Head | Oven Loader | Pennsylvania |
| 59 | Hedwig Socha | 25 | Wife | Clipper | Michigan |
| 60 | Gerald Socha | 0 | Son | — | Michigan |
| 61 | Walter Churilla | 30 | Head | Spot Welder | Pennsylvania |
| 62 | Jean Churilla | 28 | Wife | Marking Dept. | Pennsylvania |
| 63 | Peter Srutkowski | 67 | Head | Yardman | Poland |
| 64 | Rose Srutkowski | 63 | Wife | H | Germany |
| 65 | William Srutkowski | 32 | Son | Body Repair | Michigan |
| 66 | John Gedvilos | 23 | Son-in-law | Chassis Assembler | Indiana |
| 67 | Clara Gedvilos | 21 | Daughter | Striper | Michigan |
| 68 | Reginald Gedvilos | 1 | Grandson | — | Michigan |
| 69 | John Shepp | 37 | Head | Manager | Wisconsin |
| 70 | Cecile Shepp | 35 | Wife | H | Michigan |
| 71 | John Jr. Shepp | 13 | Son | — | Michigan |
| 72 | Richard Shepp | 10 | Son | — | Michigan |
| 73 | Peter Kozlowski | 52 | Head | Cook | Poland |
| 74 | Hattie Kozlowski | 21 | Daughter | Power Machine | Germany |
| 75 | John Kozlowski THIS PERSON | 25 | Son | Truck Driver | Illinois |
| 76 | Stella Kozlowski | 20 | Daughter | New Worker | W. Virginia |
| 77 | Juanita Kozlowski | 14 | Daughter | S | W. Virginia |
| 78 | Walter Kozlowski | 11 | Daughter | — | W. Virginia |
| 79 | Aloysius Kluka | 44 | Head | Square Shearer | Poland |
| 80 | Antonia Kluka | 39 | Wife | Stuffer | Poland |
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)