JK
John Kozlowski — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Cuyahoga-County, Ohio
Our Model Tree links this John Kozlowski across the 1930 and 1940 US Censuses in Cuyahoga-County, Ohio (XGBoost, ~Confirmed) — first a son (b.~1926), then head of a 5-person household.
Age 14
b. ~1926
Male
Son
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Cuyahoga-County, Ohio |
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Parma city |
| 1935 Residence (County) | Cuyahoga |
| Additional Details | |
| Highest Grade | 6 |
| 1935 Residence | Same House |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | Parma City |
| Est. Birth Year | ~1926 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Kozlowski | Head | — | 46 | ~1894 |
| Virginia Kozlowski | Daughter | — | 21 | ~1919 |
| John Kozlowski | Son | — | 14 | ~1926 |
| Cecilia Kozlowski | Spouse | — | 46 | ~1894 |
| Elizabeth Kozlowski | Daughter | — | 29 | ~1911 |
Census Appearances
1930
Cuyahoga, Ohio
Son, age 4
Cuyahoga, Ohio · implied b. ~1926 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlowski |
| Given Name | John Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Ohio |
| Mother's Birthplace | Ohio |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Cuyahoga-County, Ohio
Son, age 14
Cuyahoga-County, Ohio · implied b. ~1926 — 5 household members
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Parma city |
| 1935 Residence (County) | Cuyahoga |
| Highest Grade | 6 |
| 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 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 14 · b. ~1926 · Ohio
★ You are viewing this record
Sibling
Elizabeth Kozlowski
Sibling · 1940 · age 29
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Virginia Kozlowski
Sibling · 1940 · age 21
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
40 people indexed on this census page (nara:1940:m-t0627-03057-00572)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | George, Roger Arnold | 22 | Son | Salesman | Ohio |
| 2 | Lois Arnold | 21 | Daughter-in-law | Beauty Opr. | Ohio |
| 3 | Herman Florian | 38 | Head | Collector | Ohio |
| 4 | Mildred Florian | 37 | Wife | — | Pennsylvania |
| 5 | Richard Florian | 10 | Son | — | Ohio |
| 6 | Wesley Florian | 6 | Son | — | Ohio |
| 7 | Lloyd Florian | 4 | Son | — | Ohio |
| 8 | Michael Mcnamara | 42 | Head | Salesman | Pennsylvania |
| 9 | Irene Mcnamara | 38 | Wife | — | Ohio |
| 10 | Rita Mcnamara | 18 | Daughter | Graduate | Ohio |
| 11 | Betty Jane Mcnamara | 16 | Daughter | — | Ohio |
| 12 | Clarence Watkins | 33 | Head | Supervisor | Pennsylvania |
| 13 | Margaret Watkins | 31 | Wife | — | Pennsylvania |
| 14 | Wayne Watkins | 10 | Son | — | Pennsylvania |
| 15 | Dolores Watkins | 7 | Daughter | — | Pennsylvania |
| 16 | William Mcguire | 33 | Brother-in-law | Clerk | Pennsylvania |
| 17 | John Kozlowski | 46 | Head | Truck Driver | Ohio |
| 18 | Cecilia Kozlowski | 46 | Wife | — | Ohio |
| 19 | Elizabeth Kozlowski | 29 | Daughter | — | Ohio |
| 20 | Virginia Kozlowski | 21 | Daughter | Clerk | Ohio |
| 21 | John Kozlowski THIS PERSON | 14 | Son | — | Ohio |
| 22 | Frank Loesch | 41 | Head | General Contr. | Ohio |
| 23 | Frances Loesch | 31 | Wife | — | Ohio |
| 24 | Mary Louise Loesch | 2 | Daughter | — | Ohio |
| 25 | Harry Pavluk | 52 | Head | Machine Opr. | Poland |
| 26 | Sophie Pavluk | 49 | Wife | — | Poland |
| 27 | Stephen Pavluk | 26 | Son | Proprietor | Ohio |
| 28 | Sophia Pavluk | 23 | Daughter | Factory Worker | Ohio |
| 29 | Anna Pavluk | 20 | Daughter | Proprietress | Ohio |
| 30 | Walter Pavluk | 18 | Son | — | Ohio |
| 31 | Harold Callaway | 46 | Head | Sherman | Ohio |
| 32 | Rose Callaway | 42 | Wife | — | Ohio |
| 33 | Ronald Callaway | 15 | Son | — | Ohio |
| 34 | Wallis Callaway | 14 | Son | — | Ohio |
| 35 | James Callaway | 12 | Son | — | Ohio |
| 36 | Harold Jr. Callaway | 8 | Son | — | Ohio |
| 37 | Emma Clark | 50 | Sister-in-law | Helper (In Lunch Room) | Ohio |
| 38 | Catherine Clark | 17 | Niece | Radio Papers | Ohio |
| 39 | Mary Ann Dietrich | 14 | Niece | — | Ohio |
| 40 | Lewis Lucas | 25 | Head | Inspector | Ohio |
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)