JK
John Kozlowski — 1930 US Census Record
Linked across censuses1930 United States Federal Census · Bergen, New Jersey
Our Model Tree links this John Kozlowski across the 1930 and 1940 US Censuses in Bergen, New Jersey (XGBoost, ~Confirmed) — first a son (b.~1928), then head of a 13-person household.
Age 2
b. ~1928
Male
Son
Born: New Jersey
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Bergen, New Jersey |
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Poland |
| Mother's Birthplace | New Jersey |
| Additional Details | |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
| Township / Ward | Lodi Borough |
| Est. Birth Year | ~1928 |
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.
13 people recorded at the same address in the 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Joseph Kozlowski | Head | — | 42 | ~1888 |
| Raymond Kozlowski | Son | — | 14 | ~1916 |
| Anna Kozlowski | Daughter | — | 1 | ~1929 |
| Mary Kozlowski | Spouse | — | 38 | ~1892 |
| Theresa Kozlowski | Daughter | — | ~1930 | |
| Mary Kozlowski | Daughter | — | 11 | ~1919 |
| Joseph Kozlowski | Son | — | 17 | ~1913 |
| Sophie Kozlowski | Daughter | — | 4 | ~1926 |
| Henry Kozlowski | Son | — | 13 | ~1917 |
| John Kozlowski | Son | — | 2 | ~1928 |
| Stanley Kozlowski | Son | — | 6 | ~1924 |
| Victoria Kozlowski | Daughter | — | 9 | ~1921 |
| Edward Kozlowski | Son | — | 15 | ~1915 |
Census Appearances
1930
Bergen, New …
Son, age 2
Bergen, New Jersey · implied b. ~1928 — 13 household members
| Surname | Kozlowski |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | New Jersey |
| Father's Birthplace | Poland |
| Mother's Birthplace | New Jersey |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
1940
Hudson-County, New …
Son, age 13
Hudson-County, New Jersey · implied b. ~1927 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Kozlow |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | New Jersey |
| 1935 Residence (City) | Harrison |
| 1935 Residence (County) | Hudson |
| Occupation | none |
| Income (1939) | 0 |
| Highest Grade | 6 |
| 1935 Residence | Same Place |
| Birth State | New Jersey |
| Birth Country | United States |
| Birthplace (normalized) | new jersey |
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 · 1930 · age 2 · b. ~1928 · New Jersey
★ You are viewing this record
Sibling
Theresa Kozlowski
Sibling · 1930 · age
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Kozlowski
Sibling · 1930 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph Kozlowski
Sibling · 1930 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Stanley Kozlowski
Sibling · 1930 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Victoria Kozlowski
Sibling · 1930 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sophie Kozlowski
Sibling · 1930 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Anna Kozlowski
Sibling · 1930 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Henry Kozlowski
Sibling · 1930 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Edward Kozlowski
Sibling · 1930 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Raymond Kozlowski
Sibling · 1930 · age 14
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
1930 US Federal Census — Bergen, New Jersey
Open full size
1930 US Federal Census — Bergen, New Jersey
Page Contents
50 people indexed on this census page (ia:1930:newjerseycensus00reel1314:0382)
| Line | Name | Age | Relation | Birthplace |
|---|---|---|---|---|
| 1 | Bernhard Chmielewski | 38 | Head | New Jersey |
| 2 | Bertha Chmielewski | 38 | Wife | New Jersey |
| 3 | Walter Chmielewski | 18 | Son | New Jersey |
| 4 | Helen Chmielewski | 17 | Daughter | New Jersey |
| 5 | Edward Chmielewski | 9 | Son | New Jersey |
| 6 | Bernhard Chmielewski | 4 | Son | New Jersey |
| 7 | Joseph Kozlowski | 42 | Head | Poland |
| 8 | Mary Kozlowski | 38 | Wife | New Jersey |
| 9 | Joseph Kozlowski | 17 | Son | New Jersey |
| 10 | Edward Kozlowski | 15 | Son | New Jersey |
| 11 | Raymond Kozlowski | 14 | Son | New Jersey |
| 12 | Henry Kozlowski | 13 | Son | New Jersey |
| 13 | Mary Kozlowski | 11 | Daughter | New Jersey |
| 14 | Victoria Kozlowski | 9 | Daughter | New Jersey |
| 15 | Stanley Kozlowski | 6 | Son | New Jersey |
| 16 | Sophie Kozlowski | 4 | Daughter | New Jersey |
| 17 | John Kozlowski THIS PERSON | 2 | Son | New Jersey |
| 18 | Anna Kozlowski | 1 | Daughter | New Jersey |
| 19 | Theresa Kozlowski | 0 | Daughter | New Jersey |
| 20 | Joseph Sielski | 42 | Head | Poland |
| 21 | Martha Sielski | 35 | Wife | New Jersey |
| 22 | Joseph Sielski | 17 | Son | New Jersey |
| 23 | Edward Sielski | 15 | Son | New Jersey |
| 24 | Henry Sielski | 13 | Son | New Jersey |
| 25 | Catherine Sielski | 11 | Daughter | New Jersey |
| 26 | Frank Sielski | 9 | Son | New Jersey |
| 27 | Martha Sielski | 6 | Daughter | New Jersey |
| 28 | Sophie Sielski | 4 | Daughter | New Jersey |
| 29 | Anna Sielski | 2 | Daughter | New Jersey |
| 30 | Theresa Sielski | 0 | Daughter | New Jersey |
| 31 | Joseph Smith | 42 | Head | Poland |
| 32 | Mary Smith | 38 | Wife | New Jersey |
| 33 | Joseph Smith | 17 | Son | New Jersey |
| 34 | Edward Smith | 15 | Son | New Jersey |
| 35 | Raymond Smith | 14 | Son | New Jersey |
| 36 | Henry Smith | 13 | Son | New Jersey |
| 37 | Mary Smith | 11 | Daughter | New Jersey |
| 38 | Victoria Smith | 9 | Daughter | New Jersey |
| 39 | Stanley Smith | 6 | Son | New Jersey |
| 40 | Sophie Smith | 4 | Daughter | New Jersey |
| 41 | John Smith | 2 | Son | New Jersey |
| 42 | Anna Smith | 1 | Daughter | New Jersey |
| 43 | Theresa Smith | 0 | Daughter | New Jersey |
| 44 | Joseph Kozlowski | 42 | Head | Poland |
| 45 | Mary Kozlowski | 38 | Wife | New Jersey |
| 46 | Joseph Kozlowski | 17 | Son | New Jersey |
| 47 | Edward Kozlowski | 15 | Son | New Jersey |
| 48 | Raymond Kozlowski | 14 | Son | New Jersey |
| 49 | Henry Kozlowski | 13 | Son | New Jersey |
| 50 | Mary Kozlowski | 11 | Daughter | New Jersey |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)